WO2013168955A1 - Carbon nanotube composite having improved pressure-resistance sensitivity, method for manufacturing the carbon nanotube composite, and pressure sensor including carbon nanotube composite - Google Patents

Carbon nanotube composite having improved pressure-resistance sensitivity, method for manufacturing the carbon nanotube composite, and pressure sensor including carbon nanotube composite Download PDF

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WO2013168955A1
WO2013168955A1 PCT/KR2013/003941 KR2013003941W WO2013168955A1 WO 2013168955 A1 WO2013168955 A1 WO 2013168955A1 KR 2013003941 W KR2013003941 W KR 2013003941W WO 2013168955 A1 WO2013168955 A1 WO 2013168955A1
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carbon nanotubes
carbon nanotube
nanotube composite
polymer matrix
nanoparticles
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French (fr)
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Su-Yong KWON
Yon-Kyu Park
Min Seok Kim
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Korea Research Institute Of Standards And Science
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
    • B82B1/00—Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
    • B82B1/002—Devices comprising flexible or deformable elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • C01B32/159—Carbon nanotubes single-walled
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/041—Carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/84—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by variation of applied mechanical force, e.g. of pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
    • H01L29/0657—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape of the body
    • H01L29/0665—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape of the body the shape of the body defining a nanostructure
    • H01L29/0669—Nanowires or nanotubes
    • H01L29/0673—Nanowires or nanotubes oriented parallel to a substrate

Definitions

  • the present invention relates to a carbon nanotube (CNT) composite and, more particularly, to a carbon nanotube composite having improved pressure-resistance sensing sensitivity, wherein carbon nanotubes and metallic nanoparticles having excellent electrical properties are included in a polymer matrix in order to significantly improve sensing sensitivity in a pressure-resistance characteristic, a method of manufacturing the carbon nanotube composite, and a pressure sensor including the carbon nanotube composite.
  • CNT carbon nanotube
  • Recent carbon nanotubes are being widely applied to various fields, such as energy, environments, and electronic materials, because of excellent mechanical strength, thermal conductivity, electrical conductivity, and chemical stability.
  • a carbon nanotube composite containing metal has been in the spotlight as materials for the electrodes of field emission type flat displays, fuel cells, and solar cells, materials for electronic industry, such as the hydrogen storage device of a fuel cell, a device for shielding electromagnetic waves, and raw materials for electronic ink, or high-strength materials, such as light-weight and high-strength tool steel, light-weight and high-strength vehicle parts, and materials for defense industry.
  • Active researches are recently being carried out on a carbon nanotube composite in which metallic nanoparticles are combined with carbon nanotubes.
  • the carbon nanotube composite can be applied to various fields by utilizing the characteristics of the nanoparticles as well as the characteristics of the carbon nanotube.
  • various techniques in which nanoparticles are fixed to carbon nanotubes while maintaining characteristics unique to the carbon nanotubes and the nanoparticles are being developed. From among the various techniques, in order to develop a carbon nanotube composite using metallic silver nanoparticles as the nanoparticles, there has recently been much research carried out in order to attach the silver nanoparticles to a surface of the carbon nanotubes.
  • the present invention has been made in view of the need of the development, and an object of the present invention is to provide a carbon nanotube composite having improved pressure-resistance sensing sensitivity, which has increased sensing sensitivity several tens of times for a pressure-resistance characteristic by uniformly distributing silver nanoparticles over a polymer matrix containing carbon nanotubes without adhering the silver nanoparticles to the carbon nanotubes, a method of manufacturing the carbon nanotube composite, and a pressure sensor including the carbon nanotube composite.
  • a carbon nanotube composite having improved pressure-resistance sensing sensitivity in accordance with the present invention includes a polymer matrix; carbon nanotubes contained in the polymer matrix at a specific concentration; and metallic nanoparticles contained in the polymer matrix at a specific concentration for the carbon nanotubes, wherein the carbon nanotubes and the metallic nanoparticles are distributed over the polymer matrix with no consideration taken of adhesion between the carbon nanotubes and the metallic nanoparticles.
  • the polymer matrix is at least any one of silicon rubber, polyurethane, polycarbonate, polyacetate, polymethacrylate methyl, polyvinylalcohol, ABS, epoxy, polyimide, and polydimethylsiloxane.
  • the carbon nanotubes have a specific concentration for the polymer matrix in order to have specific sensing sensitivity, and the concentration is a mass ratio of 0.18 to 0.22% versus the polydimethylsiloxane.
  • the metallic nanoparticles are nanoparticles of at least any one of palladium (Pd), rhodium (Rh), iridium (Ir), platinum (Pt), gold (Au), and silver (Ag).
  • the silver nanoparticles have a specific concentration for the carbon nanotubes in order to have predetermined electrical conductivity and mechanical properties, and the concentration is a mass ratio of 2 to 50 times versus the carbon nanotubes, more preferably, a mass ratio of 18 to 22 times.
  • a carbon nanotube composite having improved sensing sensitivity in accordance with the present invention includes a polymer matrix, carbon nanotubes, and metallic nanoparticles, wherein a concentration of the polymer matrix, the carbon nanotubes, and the metallic nanoparticles is a mass ratio of 1 : 0.0018 to 0.0022 : 0.0032 to 0.0048, the carbon nanotubes and the metallic nanoparticles are distributed over the polymer matrix, the polymer matrix is polydimethylsiloxane, and the metallic nanoparticles are silver nanoparticles.
  • a method for manufacturing a carbon nanotube composite having improved sensing sensitivity in accordance with the present invention includes a first step S10 of preparing carbon nanotubes having a specific concentration for a polymer matrix; a second step S20 of preparing metallic nanoparticles having a specific concentration for the carbon nanotubes; and a third step S30 of mixing the carbon nanotubes and the metallic nanoparticles with the polymer matrix, wherein in the third step S30, the carbon nanotubes and the metallic nanoparticles are distributed over the polymer matrix with no consideration taken of adhesion between the carbon nanotubes and the metallic nanoparticles.
  • the polymer matrix is polydimethylsiloxane
  • the metallic nanoparticles are silver nanoparticles
  • the polydimethylsiloxane, the carbon nanotubes, and the silver nanoparticles are mixed at a concentration of a mass ratio of 1 : 0.0018 to 0.0022 : 0.032 to 0.048.
  • the present invention includes a pressure sensor manufactured including a carbon nanotube composite according to any one of claims 1 to 8.
  • silver nanoparticles are not adhered to a surface of carbon nanotubes, but the carbon nanotubes and the silver nanoparticles are mixed with a polymer matrix at an optimum concentration by distributing the carbon nanotubes and the silver nanoparticles over the polymer matrix. Accordingly, there is an advantage in that the carbon nanotube composite has sensing sensitivity improved at least 10 to 30 times. As a result, there is an advantage in that the pressure sensor manufactured including the carbon nanotube composite also has maximized sensing sensitivity.
  • FIG. 1 is a photograph of a conventional carbon nanotube composite including silver nanoparticles, which was captured by a Transmission Electron Microscope.
  • FIG. 2 is an enlarged view schematically showing a part of the carbon nanotube composite of FIG. 1.
  • FIG. 3 is an enlarged view schematically showing a part of a carbon nanotube composite having improved pressure-resistance sensing sensitivity in accordance with a preferred embodiment of the present invention.
  • FIG. 4 is a graph showing the resistance-pressure sensitivity of polydimethylsiloxane and carbon nanotubes included in a polymer matrix shown in FIG. 3.
  • FIG. 5 is a graph showing a pressure and resistance characteristic depending on a distribution of silver nanoparticles in FIG. 3.
  • FIG. 6 is a process diagram for manufacturing the carbon nanotube composite of FIG. 3.
  • FIG. 3 is an enlarged view schematically showing a part of a carbon nanotube composite having improved pressure-resistance sensing sensitivity in accordance with a preferred embodiment of the present invention.
  • the carbon nanotube composite 100 in accordance with the present invention includes carbon nanotubes 120 and metallic nanoparticles 130 contained in a polymer matrix 110.
  • the carbon nanotubes 120 and the metallic nanoparticles 130 are simply distributed over the polymer matrix 110 in the state in which adhesion between the carbon nanotubes 120 and the metallic nanoparticles 130 is not taken into consideration.
  • the polymer matrix 110 can be made of any polymer irrespective of its molecular weight, density, molecular structure, and whether or not a functional group is present as long as the polymer can compound the carbon nanotubes 120, that is, conductive fillers, and the metallic nanoparticles 130.
  • the polymer matrix 110 correspond to functional thermosetting resin, such as epoxy or polyimide, in addition to a general-purpose polymer, such as silicon rubber, polyurethane, polycarbonate, polyacetate, polymethacrylate methyl, polyvinylalcohol, and Acrylonitrile-Butadiene-Styrene (ABS) terpolymer.
  • the polymer matrix 110 can be a mixture of the listed polymers.
  • the polymer matrix 110 preferably is polydimethylsiloxane (PDMS).
  • the carbon nanotube 120 has a hollow tube structure in which a graphite surface having a cylinder shape that has a diameter 1 to 100 nano meters (nm) and a length of several nano meter (nm) to several tens of micro meters ( ⁇ m) is rolled up.
  • the carbon nanotube 120 can be classified into a Single-Walled Carbon NanoTube (SWCNT), a Double-Walled Carbon NanoTube (DWCNT), and a Multi-Walled Carbon NanoTube (MWCNT).
  • the carbon nanotube 120 shows various electrical characteristics ranging from conductors to semiconductors depending on an angle and structure in which the graphite surface is rolled up and has advantages as excellent advanced materials because the carbon nanotube 120 has a very large surface area because of the diameter of a nano size and a high aspect ratio.
  • the carbon nanotube 120 can conduct electricity smoothly when it has a linear shape, but does not smoothly conduct electricity because resistance itself thereof is increased when the carbon nanotube 120 is bent by external force (refer to an arrow in FIG. 3).
  • the carbon nanotubes 120 have a low concentration, the resistance of the carbon nanotubes 120 is increased because a re-contact ratio between adjacent carbon nanotubes 120 is reduced when the carbon nanotubes 120 are pressed by external pressure.
  • the carbon nanotubes 120 have a difficulty in electrification. If the carbon nanotubes 120 have a high concentration, electrification is smoothly performed because a re-contact ratio between adjacent carbon nanotubes 120 is increased. Accordingly, the carbon nanotubes 120 distributed over the polymer matrix 110 are made have an optimum concentration capable of showing maximum sensing sensitivity.
  • the optimum concentration is a mass ratio of approximately 0.15 to 0.25% versus polydimethylsiloxane, preferably, a mass ratio of 0.18 to 0.22%, more preferably, a mass ratio of 0.2%.
  • the metallic nanoparticles 130 are materials that are reacted with the carbon nanotubes 120 so that the metallic nanoparticles 130 have excellent electrical conductivity and mechanical properties.
  • the metallic nanoparticles can be at least any one metal selected from metals, such as palladium (Pd), rhodium (Rh), iridium (Ir), platinum (Pt), gold (Au), and silver (Ag).
  • the metallic nanoparticles 130 preferably are silver nanoparticles.
  • an additional equipment or apparatus is necessary in order to adhere silver nanoparticles to a surface of the carbon nanotubes 120.
  • the silver nanoparticles and the carbon nanotubes 120 are distributed over and disposed in the polymer matrix 110 in the state in which this equipment or apparatus has been excluded.
  • an additional equipment or apparatus is not used as in a prior art because the silver nanoparticles and the carbon nanotubes 120 have very low mutual adhesive force, but the distribution state of the silver nanoparticles and the carbon nanotubes 120 can be derived by only mixing and stirring the silver nanoparticles and the carbon nanotubes at a specific mass ratio. That is, the costs of production and a manufacturing time are reduced because an additional equipment or apparatus, such as that in a prior art, is excluded in order to adhere the silver nanoparticles to the carbon nanotubes 120.
  • the silver nanoparticles have an optimum concentration for the carbon nanotubes 120 in order to show maximum electrical conductivity and mechanical properties.
  • the optimum concentration was a mass ratio of approximately 2 to 50 times versus the carbon nanotubes 120, preferably, a mass ratio of 18 to 22 times, more preferably, a mass ratio o 20 times.
  • FIG. 4 is a graph showing the resistance-pressure sensitivity of polydimethylsiloxane and the carbon nanotubes within the polymer matrix shown in FIG. 3
  • FIG. 5 is a graph showing a pressure and resistance characteristic depending on a distribution of the silver nanoparticles in FIG. 3
  • FIG. 6 is a process diagram for manufacturing the carbon nanotube composite of FIG. 3.
  • the carbon nanotubes 120 having a specific concentration for the polymer matrix 110 are prepared (S10).
  • the specific concentration of the carbon nanotubes 120 preferably is an optimum concentration of the carbon nanotubes 120 which can obtain the highest sensitivity for the polymer matrix 110.
  • the polymer matrix 110 is polydimethylsiloxane.
  • the resistance is increased by pressure as in FIG. 4 showing the degree of relative resistance (R/RO) dependency between the carbon nanotubes 120 and the pressure.
  • R is resistance under applied pressure
  • RO is basic resistance in the state in which pressure has not been applied. More particularly, from FIG.
  • a compound containing multi-walled carbon nanotubes having a low weight ratio (wt.%) shows significant resistance-pressure sensitivity under the same pressure and, in particular, a compound containing multi-walled carbon nanotubes having a weight ratio of 0.2% shows the highest resistance-pressure sensitivity.
  • a modification of a shape of the carbon nanotube 120 and characteristics, such as a contact, separation, and a re-contact between the carbon nanotubes 120 must be taken into consideration. Accordingly, the optimum concentration of the carbon nanotubes 120 capable of showing maximum sensing sensitivity is calculated. The present applicant calculated the optimum concentration of the carbon nanotubes 120 through repetitive experiments.
  • the optimum concentration of the carbon nanotubes 120 was a mass ratio of approximately 0.15 to 0.25% versus polydimethylsiloxane, preferably, a mass ratio of 0.18 to 0.22%, more preferably, a mass ratio of 0.2%.
  • the metallic nanoparticles 130 having a specific concentration for the carbon nanotubes 120 are prepared (S20).
  • the specific concentration of the metallic nanoparticles 130 preferably is an optimum concentration of the metallic nanoparticles 130 for the carbon nanotubes 120, which can obtain the highest electrical conductivity and mechanical properties.
  • the metallic nanoparticles 130 are silver nanoparticles.
  • resistance is increased by pressure as in FIG. 5 showing the degree of relative resistance (R/R0) dependency between the carbon nanotubes 120 and the silver nanoparticles.
  • the concentration ratio of the silver nanoparticles is less than 2 times, an effect in which pressure and resistance characteristics are increased is low and a conduction effect is insufficient. Furthermore, if the concentration ratio of the silver nanoparticles exceeds 50 times, the silver nanoparticles become a supersaturation state. In this supersaturation state, the carbon nanotubes 120 are spaced apart from one another, and thus a probability that the carbon nanotubes 120 will come into contact with the silver nanoparticles is increased. As a result, resistance is increased and the pressure and resistance characteristics are also decreased.
  • the carbon nanotubes 120 and the metallic nanoparticles 130 are mixed with the polymer matrix 110 (S30).
  • the silver nanoparticles are not adhered to a surface of the carbon nanotubes 120, but are uniformly distributed over and mixed with polydimethylsiloxane.
  • the carbon nanotubes 120 may be thrown in a mixture of the silver nanoparticles and polydimethylsiloxane after the silver nanoparticles are mixed with polydimethylsiloxane, the silver nanoparticles and the carbon nanotubes 120 may be thrown in polydimethylsiloxane at the same time, or the silver nanoparticles may be thrown in a mixture of polydimethylsiloxane and the carbon nanotubes 120 after the carbon nanotubes 120 are thrown in polydimethylsiloxane.
  • the carbon nanotube composite 100 includes the polymer matrix 110, the carbon nanotubes 120, and the metallic nanoparticles 130 having a composition ratio of 1 : 0.0018 to 0.0022 : 0.032 to 0.048 mass ratio in order to increase sensing sensitivity at least 10 to 30 times as compared with a prior art depending on its pressure-resistance characteristic. More precisely, the carbon nanotube composite 100 includes polydimethylsiloxane, the carbon nanotubes 120, and the silver nanoparticles having a composition ratio of 1 : 0.002 : 0.04 mass ratio.
  • an additional adhesion process can be excluded because a process for attaching the silver nanoparticles to a surface of the carbon nanotubes 120 is not taken into consideration, and stirring or a conventional technique for uniformly distributing the silver nanoparticles and the carbon nanotubes 120 can be used.

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Abstract

The present invention relates to a carbon nanotube composite having improved pressure-resistance sensing sensitivity, a method of manufacturing the carbon nanotube composite, and a pressure sensor including the carbon nanotube composite. A polymer matrix of polydimethylsiloxane, carbon nanotubes, and silver nanoparticles are mixed at a mass ratio of 1 : 0.0018 to 0.0022 : 0.032 to 0.048, and the carbon nanotube and the metallic nanoparticles are uniformly distributed over the polymer matrix. The silver nanoparticles are not attached to a surface of the carbon nanotube, but the carbon nanotube and the silver nanoparticles are uniformly distributed over the polymer matrix. Accordingly, the linearity of the carbon nanotube can be improved, the carbon nanotube composite has improved sensing sensitivity, and the carbon nanotube composite can be manufactured very simply.

Description

CARBON NANOTUBE COMPOSITE HAVING IMPROVED PRESSURE-RESISTANCE SENSITIVITY, METHOD FOR MANUFACTURING THE CARBON NANOTUBE COMPOSITE, AND PRESSURE SENSOR INCLUDING CARBON NANOTUBE COMPOSITE
The present invention relates to a carbon nanotube (CNT) composite and, more particularly, to a carbon nanotube composite having improved pressure-resistance sensing sensitivity, wherein carbon nanotubes and metallic nanoparticles having excellent electrical properties are included in a polymer matrix in order to significantly improve sensing sensitivity in a pressure-resistance characteristic, a method of manufacturing the carbon nanotube composite, and a pressure sensor including the carbon nanotube composite.
Recent carbon nanotubes are being widely applied to various fields, such as energy, environments, and electronic materials, because of excellent mechanical strength, thermal conductivity, electrical conductivity, and chemical stability. Recently, a carbon nanotube composite containing metal has been in the spotlight as materials for the electrodes of field emission type flat displays, fuel cells, and solar cells, materials for electronic industry, such as the hydrogen storage device of a fuel cell, a device for shielding electromagnetic waves, and raw materials for electronic ink, or high-strength materials, such as light-weight and high-strength tool steel, light-weight and high-strength vehicle parts, and materials for defense industry. Active researches are recently being carried out on a carbon nanotube composite in which metallic nanoparticles are combined with carbon nanotubes. Accordingly, the carbon nanotube composite can be applied to various fields by utilizing the characteristics of the nanoparticles as well as the characteristics of the carbon nanotube. For this application, various techniques in which nanoparticles are fixed to carbon nanotubes while maintaining characteristics unique to the carbon nanotubes and the nanoparticles are being developed. From among the various techniques, in order to develop a carbon nanotube composite using metallic silver nanoparticles as the nanoparticles, there has recently been much research carried out in order to attach the silver nanoparticles to a surface of the carbon nanotubes. However, there is a difficulty in manufacturing the carbon nanotube composite because bonding between the silver nanoparticles and a surface of the carbon nanotubes is weak and it is difficult to uniformly decorate the silver nanoparticles on a surface of the carbon nanotubes due to the cohesiveness of the silver nanoparticles.
In a conventional carbon nanotube composite (refer to FIG. 1) disclosed in Korean Patent Registration No.0961914 into which the problem is taken into consideration, there was proposed a manufacturing method for producing a carbon nanotube dispersant in which carbon nanotubes are dispersed in an organic solvent, adhering silver nanoparticles to a surface of the carbon nanotubes by injecting a solution, including silver ions, into the carbon nanotube dispersant, and performing centrifugal and washing processes.
There has been active research carried out on a variety of methods for manufacturing a carbon nanotube composite by adhering silver nanoparticles to carbon nanotubes, including this manufacturing method. The applicant of the present invention also repeatedly performed experiments for adhering silver nanoparticles 12 to the carbon nanotubes 11 as shown in FIG. 2 based on a variety of conventional manufacturing methods and for manufacturing a carbon nanotube composite 10 for inventing a better manufacturing method based on the results of the measurement on the output. Describing in brief, the carbon nanotubes 11 were mixed with a polymer matrix 13 so that they have an optimum concentration and maximum sensing sensitivity, and the silver nanoparticles 12 were adhered to the carbon nanotubes 11 using one of the conventional manufacturing methods. Next, the carbon nanotubes 11 were made bent by external force (refer to an arrow in FIG. 2) so that they had varying resistance values.
However, as a result of the measurement of performance for the physical properties of the carbon nanotube composite 10 in which the silver nanoparticles 12 were adhered to the carbon nanotubes 11, it was difficult to obtain improved performance in the content of the carbon nanotubes 11 having a concentration showing a maximum sensing characteristic unlike expected, but the carbon nanotube composite 10 has a characteristic in that the carbon nanotubes 11 having a higher concentration must be included. In particular, sensing sensitivity was much below expected results because the carbon nanotube composite had high resistance, and thus there is a need for development for compensating for this problem.
The present invention has been made in view of the need of the development, and an object of the present invention is to provide a carbon nanotube composite having improved pressure-resistance sensing sensitivity, which has increased sensing sensitivity several tens of times for a pressure-resistance characteristic by uniformly distributing silver nanoparticles over a polymer matrix containing carbon nanotubes without adhering the silver nanoparticles to the carbon nanotubes, a method of manufacturing the carbon nanotube composite, and a pressure sensor including the carbon nanotube composite.
To achieve the above object, a carbon nanotube composite having improved pressure-resistance sensing sensitivity in accordance with the present invention includes a polymer matrix; carbon nanotubes contained in the polymer matrix at a specific concentration; and metallic nanoparticles contained in the polymer matrix at a specific concentration for the carbon nanotubes, wherein the carbon nanotubes and the metallic nanoparticles are distributed over the polymer matrix with no consideration taken of adhesion between the carbon nanotubes and the metallic nanoparticles.
Here, the polymer matrix is at least any one of silicon rubber, polyurethane, polycarbonate, polyacetate, polymethacrylate methyl, polyvinylalcohol, ABS, epoxy, polyimide, and polydimethylsiloxane.
Furthermore, the carbon nanotubes have a specific concentration for the polymer matrix in order to have specific sensing sensitivity, and the concentration is a mass ratio of 0.18 to 0.22% versus the polydimethylsiloxane.
Furthermore, the metallic nanoparticles are nanoparticles of at least any one of palladium (Pd), rhodium (Rh), iridium (Ir), platinum (Pt), gold (Au), and silver (Ag).
Here, the silver nanoparticles have a specific concentration for the carbon nanotubes in order to have predetermined electrical conductivity and mechanical properties, and the concentration is a mass ratio of 2 to 50 times versus the carbon nanotubes, more preferably, a mass ratio of 18 to 22 times.
Meanwhile, a carbon nanotube composite having improved sensing sensitivity in accordance with the present invention includes a polymer matrix, carbon nanotubes, and metallic nanoparticles, wherein a concentration of the polymer matrix, the carbon nanotubes, and the metallic nanoparticles is a mass ratio of 1 : 0.0018 to 0.0022 : 0.0032 to 0.0048, the carbon nanotubes and the metallic nanoparticles are distributed over the polymer matrix, the polymer matrix is polydimethylsiloxane, and the metallic nanoparticles are silver nanoparticles.
Meanwhile, a method for manufacturing a carbon nanotube composite having improved sensing sensitivity in accordance with the present invention includes a first step S10 of preparing carbon nanotubes having a specific concentration for a polymer matrix; a second step S20 of preparing metallic nanoparticles having a specific concentration for the carbon nanotubes; and a third step S30 of mixing the carbon nanotubes and the metallic nanoparticles with the polymer matrix, wherein in the third step S30, the carbon nanotubes and the metallic nanoparticles are distributed over the polymer matrix with no consideration taken of adhesion between the carbon nanotubes and the metallic nanoparticles.
Here, the polymer matrix is polydimethylsiloxane, the metallic nanoparticles are silver nanoparticles, and the polydimethylsiloxane, the carbon nanotubes, and the silver nanoparticles are mixed at a concentration of a mass ratio of 1 : 0.0018 to 0.0022 : 0.032 to 0.048.
Meanwhile, the present invention includes a pressure sensor manufactured including a carbon nanotube composite according to any one of claims 1 to 8.
As described above, in accordance with the present invention, silver nanoparticles are not adhered to a surface of carbon nanotubes, but the carbon nanotubes and the silver nanoparticles are mixed with a polymer matrix at an optimum concentration by distributing the carbon nanotubes and the silver nanoparticles over the polymer matrix. Accordingly, there is an advantage in that the carbon nanotube composite has sensing sensitivity improved at least 10 to 30 times. As a result, there is an advantage in that the pressure sensor manufactured including the carbon nanotube composite also has maximized sensing sensitivity.
Furthermore, a complicated process for coating silver nanoparticles on a surface of carbon nanotubes as in a prior art is excluded, and carbon nanotubes and silver nanoparticles having a low mutual adhesive property are simply mixed with a polymer matrix. Accordingly, there is an advantage in that the carbon nanotube composite can be manufactured very simply.
The following drawings adhered to this specification illustrate a preferred embodiment of the present invention and function to further facilitate understanding of the technical spirit of the present invention along with the detailed description of the present invention. Accordingly, the present invention should not be construed as being limited to only the drawings.
FIG. 1 is a photograph of a conventional carbon nanotube composite including silver nanoparticles, which was captured by a Transmission Electron Microscope.
FIG. 2 is an enlarged view schematically showing a part of the carbon nanotube composite of FIG. 1.
FIG. 3 is an enlarged view schematically showing a part of a carbon nanotube composite having improved pressure-resistance sensing sensitivity in accordance with a preferred embodiment of the present invention.
FIG. 4 is a graph showing the resistance-pressure sensitivity of polydimethylsiloxane and carbon nanotubes included in a polymer matrix shown in FIG. 3.
FIG. 5 is a graph showing a pressure and resistance characteristic depending on a distribution of silver nanoparticles in FIG. 3.
FIG. 6 is a process diagram for manufacturing the carbon nanotube composite of FIG. 3.
Hereinafter, a preferred embodiment of the present invention is described in detail with reference to the accompanying drawings in order for those skilled in the art to be able to readily practice them. In describing an operational principle relating to the preferred embodiment of the present invention, however, when a detailed description of relevant functions or constructions is determined to make unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.
<Construction>
FIG. 3 is an enlarged view schematically showing a part of a carbon nanotube composite having improved pressure-resistance sensing sensitivity in accordance with a preferred embodiment of the present invention.
First, the carbon nanotube composite 100 in accordance with the present invention, as shown in FIG. 3, includes carbon nanotubes 120 and metallic nanoparticles 130 contained in a polymer matrix 110. In particular, the carbon nanotubes 120 and the metallic nanoparticles 130 are simply distributed over the polymer matrix 110 in the state in which adhesion between the carbon nanotubes 120 and the metallic nanoparticles 130 is not taken into consideration.
The polymer matrix 110 can be made of any polymer irrespective of its molecular weight, density, molecular structure, and whether or not a functional group is present as long as the polymer can compound the carbon nanotubes 120, that is, conductive fillers, and the metallic nanoparticles 130. For example, the polymer matrix 110 correspond to functional thermosetting resin, such as epoxy or polyimide, in addition to a general-purpose polymer, such as silicon rubber, polyurethane, polycarbonate, polyacetate, polymethacrylate methyl, polyvinylalcohol, and Acrylonitrile-Butadiene-Styrene (ABS) terpolymer. The polymer matrix 110 can be a mixture of the listed polymers. In applications requiring thermal and mechanical shock strength, a polymer having an excellent elongation characteristic and shock-absorbing effect, such as silicon rubber or polyurethane, is more effective. In the embodiment of the present invention, in particular, the polymer matrix 110 preferably is polydimethylsiloxane (PDMS).
The carbon nanotube 120 has a hollow tube structure in which a graphite surface having a cylinder shape that has a diameter 1 to 100 nano meters (㎚) and a length of several nano meter (㎚) to several tens of micro meters (㎛) is rolled up. The carbon nanotube 120 can be classified into a Single-Walled Carbon NanoTube (SWCNT), a Double-Walled Carbon NanoTube (DWCNT), and a Multi-Walled Carbon NanoTube (MWCNT). Furthermore, the carbon nanotube 120 shows various electrical characteristics ranging from conductors to semiconductors depending on an angle and structure in which the graphite surface is rolled up and has advantages as excellent advanced materials because the carbon nanotube 120 has a very large surface area because of the diameter of a nano size and a high aspect ratio. The carbon nanotube 120 can conduct electricity smoothly when it has a linear shape, but does not smoothly conduct electricity because resistance itself thereof is increased when the carbon nanotube 120 is bent by external force (refer to an arrow in FIG. 3). Furthermore, if the carbon nanotubes 120 have a low concentration, the resistance of the carbon nanotubes 120 is increased because a re-contact ratio between adjacent carbon nanotubes 120 is reduced when the carbon nanotubes 120 are pressed by external pressure. As a result, the carbon nanotubes 120 have a difficulty in electrification. If the carbon nanotubes 120 have a high concentration, electrification is smoothly performed because a re-contact ratio between adjacent carbon nanotubes 120 is increased. Accordingly, the carbon nanotubes 120 distributed over the polymer matrix 110 are made have an optimum concentration capable of showing maximum sensing sensitivity. Here, the optimum concentration is a mass ratio of approximately 0.15 to 0.25% versus polydimethylsiloxane, preferably, a mass ratio of 0.18 to 0.22%, more preferably, a mass ratio of 0.2%.
The metallic nanoparticles 130 are materials that are reacted with the carbon nanotubes 120 so that the metallic nanoparticles 130 have excellent electrical conductivity and mechanical properties. The metallic nanoparticles can be at least any one metal selected from metals, such as palladium (Pd), rhodium (Rh), iridium (Ir), platinum (Pt), gold (Au), and silver (Ag). In the present invention, in particular, the metallic nanoparticles 130 preferably are silver nanoparticles. In a prior art, an additional equipment or apparatus is necessary in order to adhere silver nanoparticles to a surface of the carbon nanotubes 120. In the present invention, however, the silver nanoparticles and the carbon nanotubes 120 are distributed over and disposed in the polymer matrix 110 in the state in which this equipment or apparatus has been excluded. Here, an additional equipment or apparatus is not used as in a prior art because the silver nanoparticles and the carbon nanotubes 120 have very low mutual adhesive force, but the distribution state of the silver nanoparticles and the carbon nanotubes 120 can be derived by only mixing and stirring the silver nanoparticles and the carbon nanotubes at a specific mass ratio. That is, the costs of production and a manufacturing time are reduced because an additional equipment or apparatus, such as that in a prior art, is excluded in order to adhere the silver nanoparticles to the carbon nanotubes 120. Furthermore, the silver nanoparticles have an optimum concentration for the carbon nanotubes 120 in order to show maximum electrical conductivity and mechanical properties. Here, the optimum concentration was a mass ratio of approximately 2 to 50 times versus the carbon nanotubes 120, preferably, a mass ratio of 18 to 22 times, more preferably, a mass ratio o 20 times.
<Manufacturing method>
FIG. 4 is a graph showing the resistance-pressure sensitivity of polydimethylsiloxane and the carbon nanotubes within the polymer matrix shown in FIG. 3, FIG. 5 is a graph showing a pressure and resistance characteristic depending on a distribution of the silver nanoparticles in FIG. 3, and FIG. 6 is a process diagram for manufacturing the carbon nanotube composite of FIG. 3.
First, the carbon nanotubes 120 having a specific concentration for the polymer matrix 110 are prepared (S10). Here, the specific concentration of the carbon nanotubes 120 preferably is an optimum concentration of the carbon nanotubes 120 which can obtain the highest sensitivity for the polymer matrix 110. Here, it is assumed that the polymer matrix 110 is polydimethylsiloxane. In order to calculate the optimum concentration of the carbon nanotubes 120, it can be seen that the resistance is increased by pressure as in FIG. 4 showing the degree of relative resistance (R/RO) dependency between the carbon nanotubes 120 and the pressure. Here, R is resistance under applied pressure, and RO is basic resistance in the state in which pressure has not been applied. More particularly, from FIG. 4, it can be seen that a compound containing multi-walled carbon nanotubes having a low weight ratio (wt.%) shows significant resistance-pressure sensitivity under the same pressure and, in particular, a compound containing multi-walled carbon nanotubes having a weight ratio of 0.2% shows the highest resistance-pressure sensitivity. In order to calculate the optimum concentration of the carbon nanotubes 120 in the polymer matrix 110, a modification of a shape of the carbon nanotube 120 and characteristics, such as a contact, separation, and a re-contact between the carbon nanotubes 120 must be taken into consideration. Accordingly, the optimum concentration of the carbon nanotubes 120 capable of showing maximum sensing sensitivity is calculated. The present applicant calculated the optimum concentration of the carbon nanotubes 120 through repetitive experiments. When the polymer matrix 110 was polydimethylsiloxane, the optimum concentration of the carbon nanotubes 120 was a mass ratio of approximately 0.15 to 0.25% versus polydimethylsiloxane, preferably, a mass ratio of 0.18 to 0.22%, more preferably, a mass ratio of 0.2%.
Next, the metallic nanoparticles 130 having a specific concentration for the carbon nanotubes 120 are prepared (S20). Here, the specific concentration of the metallic nanoparticles 130 preferably is an optimum concentration of the metallic nanoparticles 130 for the carbon nanotubes 120, which can obtain the highest electrical conductivity and mechanical properties. Here, it is assumed that the metallic nanoparticles 130 are silver nanoparticles. In order to calculate the optimum concentration of the silver nanoparticles, it can be seen that resistance is increased by pressure as in FIG. 5 showing the degree of relative resistance (R/R0) dependency between the carbon nanotubes 120 and the silver nanoparticles. More particularly, after the carbon nanotubes 120 and the silver nanoparticles were mixed at mass ratios of 1:0, 1:2, 1:20, and 1:100 and resistance values for pressure were measured. As a result of the measurement, it can be seen that the relative resistance (R/RO) rise higher as the mass ratio of the silver nanoparticles for the carbon nanotubes 120 is increased as in FIG. 5. As described above, the optimum mixture ratio of the carbon nanotubes 120 and the silver nanoparticles was calculated through the relative resistance (R/R0). A concentration ratio of the silver nanoparticles was a mass ratio of approximately 2 to 50 times versus the carbon nanotubes 120, preferably, a mass ratio of 18 to 22 times, more preferably, a mass ratio of 20 times. Here, if the concentration ratio of the silver nanoparticles is less than 2 times, an effect in which pressure and resistance characteristics are increased is low and a conduction effect is insufficient. Furthermore, if the concentration ratio of the silver nanoparticles exceeds 50 times, the silver nanoparticles become a supersaturation state. In this supersaturation state, the carbon nanotubes 120 are spaced apart from one another, and thus a probability that the carbon nanotubes 120 will come into contact with the silver nanoparticles is increased. As a result, resistance is increased and the pressure and resistance characteristics are also decreased.
Finally, the carbon nanotubes 120 and the metallic nanoparticles 130 are mixed with the polymer matrix 110 (S30). The silver nanoparticles are not adhered to a surface of the carbon nanotubes 120, but are uniformly distributed over and mixed with polydimethylsiloxane. Accordingly, the carbon nanotubes 120 may be thrown in a mixture of the silver nanoparticles and polydimethylsiloxane after the silver nanoparticles are mixed with polydimethylsiloxane, the silver nanoparticles and the carbon nanotubes 120 may be thrown in polydimethylsiloxane at the same time, or the silver nanoparticles may be thrown in a mixture of polydimethylsiloxane and the carbon nanotubes 120 after the carbon nanotubes 120 are thrown in polydimethylsiloxane. In this case, a phenomenon in which the silver nanoparticles are adhered to a surface of the carbon nanotubes 120 is prevented to a maximum extent, and the carbon nanotubes 120 and the silver nanoparticles are uniformly distributed. That is, as checked from the results of the previous experiments in which sensing sensitivity was greatly lowered according to a rise of resistance when the silver nanoparticles were adhered to the carbon nanotubes 120, adhesion between the carbon nanotubes 120 and the silver nanoparticles must be suppressed to a maximum extent. Here, since an adhesive property between the carbon nanotubes 120 and the silver nanoparticles is very low, an additional equipment or process for suppressing the adhesion is not necessary, and the carbon nanotubes 120 and the silver nanoparticles can be uniformly distributed using stirring or a conventional technique.
Collectively, the carbon nanotube composite 100 includes the polymer matrix 110, the carbon nanotubes 120, and the metallic nanoparticles 130 having a composition ratio of 1 : 0.0018 to 0.0022 : 0.032 to 0.048 mass ratio in order to increase sensing sensitivity at least 10 to 30 times as compared with a prior art depending on its pressure-resistance characteristic. More precisely, the carbon nanotube composite 100 includes polydimethylsiloxane, the carbon nanotubes 120, and the silver nanoparticles having a composition ratio of 1 : 0.002 : 0.04 mass ratio. In particular, an additional adhesion process can be excluded because a process for attaching the silver nanoparticles to a surface of the carbon nanotubes 120 is not taken into consideration, and stirring or a conventional technique for uniformly distributing the silver nanoparticles and the carbon nanotubes 120 can be used.
As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other various forms without departing from the technical spirit or essential characteristics of the present invention. Accordingly, the aforementioned embodiment should not be construed as being limitative, but should be construed as being only illustrative from all aspects. The scope of the present invention is clearly disclosed in the appended claims rather than the detailed description. It should be understood that all modifications or variations derived from the meanings and scope of the present invention and equivalents thereof are included in the scope of the appended claims.
100...carbon nanotube composite
110... polymer matrix
120...carbon nanotube
130...metallic nanoparticles

Claims (11)

  1. A carbon nanotube composite having improved pressure-resistance sensing sensitivity, comprising:
    a polymer matrix 110;
    carbon nanotubes 120 contained in the polymer matrix 110 at a specific concentration; and
    metallic nanoparticles 130 contained in the polymer matrix 110 at a specific concentration for the carbon nanotubes 120,
    wherein the carbon nanotubes 120 and the metallic nanoparticles 130 are distributed over the polymer matrix 110.
  2. The carbon nanotube composite of claim 1, wherein the carbon nanotubes 120 and the metallic nanoparticles 130 are distributed over the polymer matrix 110 with no consideration taken of adhesion between the carbon nanotubes 120 and the metallic nanoparticles 130.
  3. The carbon nanotube composite of claim 1, wherein the polymer matrix 110 is at least any one of silicon rubber, polyurethane, polycarbonate, polyacetate, polymethacrylate methyl, polyvinylalcohol, ABS, epoxy, polyimide, and polydimethylsiloxane.
  4. The carbon nanotube composite of claim 3, wherein:
    the carbon nanotubes 120 has a specific concentration for the polymer matrix 110 in order to have specific sensing sensitivity, and
    the concentration is a mass ratio of 0.18 to 0.22% versus the polydimethylsiloxane.
  5. The carbon nanotube composite of claim 1, wherein the metallic nanoparticles 130 are nanoparticles of at least any one of palladium (Pd), rhodium (Rh), iridium (Ir), platinum (Pt), gold (Au), and silver (Ag).
  6. The carbon nanotube composite of claim 5, wherein:
    the silver nanoparticles have a specific concentration for the carbon nanotubes 120 in order to have predetermined electrical conductivity and mechanical properties, and
    the concentration is a mass ratio of 2 to 50 times versus the carbon nanotubes 120.
  7. The carbon nanotube composite of claim 5, wherein:
    the silver nanoparticles has a specific concentration for the carbon nanotubes 120 in order to have specific electrical conductivity and mechanical properties, and
    the concentration is a mass ratio of 18 to 22 times versus the carbon nanotubes 120.
  8. A carbon nanotube composite having improved pressure-resistance sensing sensitivity, comprising:
    a polymer matrix 110, carbon nanotubes 120, and metallic nanoparticles 130,
    wherein a concentration of the polymer matrix 110, the carbon nanotubes 120, and the metallic nanoparticles 130 is a mass ratio of 1 : 0.0018 to 0.0022 : 0.0032 to 0.0048,
    the carbon nanotubes 120 and the metallic nanoparticles 130 are distributed over the polymer matrix 110,
    the polymer matrix 110 is polydimethylsiloxane, and
    the metallic nanoparticles 130 are silver nanoparticles.
  9. A method for manufacturing a carbon nanotube composite according to any one of claims 1 to 8, the method comprising:
    a first step S10 of preparing carbon nanotubes 120 having a specific concentration for a polymer matrix 110;
    a second step S20 of preparing metallic nanoparticles 130 having a specific concentration for the carbon nanotubes 120; and
    a third step S30 of mixing the carbon nanotubes 120 and the metallic nanoparticles 130 with the polymer matrix 110,
    wherein in the third step S30, the carbon nanotubes 120 and the metallic nanoparticles 130 are distributed over the polymer matrix 110 with no consideration taken of adhesion between the carbon nanotubes 120 and the metallic nanoparticles 130.
  10. The method of claim 9, wherein:
    the polymer matrix 110 is polydimethylsiloxane,
    the metallic nanoparticles 130 are silver nanoparticles, and
    the polydimethylsiloxane, the carbon nanotubes 120, and the silver nanoparticles are mixed at a concentration of a mass ratio of 1 : 0.0018 to 0.0022 : 0.032 to 0.048.
  11. A pressure sensor manufactured including a carbon nanotube composite according to any one of claims 1 to 8.
PCT/KR2013/003941 2012-05-10 2013-05-07 Carbon nanotube composite having improved pressure-resistance sensitivity, method for manufacturing the carbon nanotube composite, and pressure sensor including carbon nanotube composite WO2013168955A1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3104150A4 (en) * 2014-02-06 2017-10-11 Japan Science and Technology Agency Sheet for pressure sensor, pressure sensor, and method for producing sheet for pressure sensor
CN108958546A (en) * 2018-06-30 2018-12-07 云谷（固安）科技有限公司 A kind of touch-control structure and preparation method thereof
CN110177840A (en) * 2017-01-23 2019-08-27 Lg化学株式会社 Silicon rubber composite material and preparation method thereof
US10428196B2 (en) * 2014-12-11 2019-10-01 Schmutz Ip, Llc Curable nano-composites for additive manufacturing
US10995216B2 (en) 2017-01-23 2021-05-04 Lg Chem, Ltd. Silicone rubber composite and method for producing same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101707859B1 (en) * 2014-04-15 2017-02-22 서울대학교산학협력단 Process for Preparing Porous Pressure-Sensitive Rubber and Wearable Device Comprising the Same
KR101720014B1 (en) * 2014-04-30 2017-04-04 서울대학교산학협력단 Porous Pressure-Sensitive Rubber and Products Comprising the Same
KR20190125711A (en) 2018-04-30 2019-11-07 한국과학기술원 Highly Stretchable and Flexible Piezoresistive CNT-Silicone Wire Sensors and Method For Manufacturing the same
KR20190126974A (en) * 2018-05-03 2019-11-13 한국과학기술원 Variable Shape Smart Sensor Using MWCNT-Silicone Piezoresistive Wire And Its Application
KR102446078B1 (en) 2018-08-17 2022-09-22 재단법인대구경북과학기술원 Variable resistance film and sensor device comprising the same
KR102168518B1 (en) * 2018-10-05 2020-10-21 한국과학기술연구원 Conducting polymer composite with high strechability
KR20200131390A (en) 2019-05-13 2020-11-24 울산과학기술원 Composite sensor
KR102282512B1 (en) * 2020-01-02 2021-07-26 서울시립대학교 산학협력단 Smart glove with flexible pressure sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060081494A (en) * 2005-01-07 2006-07-13 삼성전기주식회사 Field emitter array and method for manufacturing the same
KR20090103140A (en) * 2008-03-27 2009-10-01 한국세라믹기술원 Pressure Sensitive Device And Tactile Sensors Using The Same
US20110163636A1 (en) * 2009-10-22 2011-07-07 Lawrence Livermore National Security, Llc Matrix-assisted energy conversion in nanostructured piezoelectric arrays
KR20110110388A (en) * 2010-04-01 2011-10-07 한국표준과학연구원 Method of manufacturing pressure sensitive device, pressure sensitive device manufactured by the same method and pressure measurement method using the same device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100961914B1 (en) * 2008-05-09 2010-06-10 한국과학기술원 Method of fabricating silver nanoparticle decorated carbon nanotube nanocomposites

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060081494A (en) * 2005-01-07 2006-07-13 삼성전기주식회사 Field emitter array and method for manufacturing the same
KR20090103140A (en) * 2008-03-27 2009-10-01 한국세라믹기술원 Pressure Sensitive Device And Tactile Sensors Using The Same
US20110163636A1 (en) * 2009-10-22 2011-07-07 Lawrence Livermore National Security, Llc Matrix-assisted energy conversion in nanostructured piezoelectric arrays
KR20110110388A (en) * 2010-04-01 2011-10-07 한국표준과학연구원 Method of manufacturing pressure sensitive device, pressure sensitive device manufactured by the same method and pressure measurement method using the same device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KWON ET AL.: "Piezoresistive Characteristics of CNT ... to Flexible Tactile Sensors", KOREAN SOCIETY FOR PRECISION ENGINEERING 2011 SPRING CONFERENCE, pages 1055 - 1056 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3104150A4 (en) * 2014-02-06 2017-10-11 Japan Science and Technology Agency Sheet for pressure sensor, pressure sensor, and method for producing sheet for pressure sensor
US10401240B2 (en) 2014-02-06 2019-09-03 Japan Science And Technology Agency Sheet for pressure sensor, pressure sensor, and method for producing sheet for pressure sensor
US10428196B2 (en) * 2014-12-11 2019-10-01 Schmutz Ip, Llc Curable nano-composites for additive manufacturing
US20200024421A1 (en) * 2014-12-11 2020-01-23 Schmutz Ip, Llc Curable nano-composites for additive manufacturing
CN110177840A (en) * 2017-01-23 2019-08-27 Lg化学株式会社 Silicon rubber composite material and preparation method thereof
US10995216B2 (en) 2017-01-23 2021-05-04 Lg Chem, Ltd. Silicone rubber composite and method for producing same
CN110177840B (en) * 2017-01-23 2022-03-01 Lg化学株式会社 Silicone rubber composite material and preparation method thereof
CN108958546A (en) * 2018-06-30 2018-12-07 云谷（固安）科技有限公司 A kind of touch-control structure and preparation method thereof
CN108958546B (en) * 2018-06-30 2021-10-12 广州国显科技有限公司 Touch structure and preparation method thereof

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