CN114606773B - Preparation method of flexible touch sensor based on textile microstructure - Google Patents

Preparation method of flexible touch sensor based on textile microstructure Download PDF

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CN114606773B
CN114606773B CN202210219199.1A CN202210219199A CN114606773B CN 114606773 B CN114606773 B CN 114606773B CN 202210219199 A CN202210219199 A CN 202210219199A CN 114606773 B CN114606773 B CN 114606773B
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textile
microstructure
flexible
film
pdms
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CN114606773A (en
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徐文涛
杜怡
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Nankai University
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Nankai University
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/208—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads cellulose-based
    • D03D15/217—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads cellulose-based natural from plants, e.g. cotton
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
    • D06B3/10—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/02—Natural fibres, other than mineral fibres
    • D06M2101/04—Vegetal fibres
    • D06M2101/06—Vegetal fibres cellulosic
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/26—Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof
    • D06M2101/28—Acrylonitrile; Methacrylonitrile
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/32—Polyesters
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/01—Natural vegetable fibres
    • D10B2201/02—Cotton
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/10—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Abstract

The invention discloses a preparation method of a flexible touch sensor based on a textile microstructure. Coating PDMS solution on the surface of a textile, removing to obtain a flexible substrate film with a textile microstructure, and coating carbon nano tube dispersion liquid on the surface of the flexible substrate film to obtain the carbon nano tube microstructure flexible film; the sensor is used as a sensitive unit structure of the sensor, so that the sensitivity of the sensor device is improved. The sensor obtained by the invention can detect various tactile information such as stretching, pressure and bending in different directions, and the sensitivity to the pressure is 2.35kPa ‑1 The sensitivity coefficient GF value to tensile strain is 200, so that the detection function of the same sensor device is complicated in the future.

Description

Preparation method of flexible touch sensor based on textile microstructure
Technical Field
The invention belongs to the field of electronic devices, and particularly relates to a preparation method of a flexible touch sensor based on a textile microstructure.
Background
With the rapid development of the fields of artificial intelligence, man-machine interaction, medical care and the like, the application of electronic skin becomes of great commercial value and research significance, wherein a bionic touch sensor for simulating the skin function of a human body is the research focus. The electronic skin is a novel electronic device for simulating the human skin to feel external stimulus (pressure, temperature and humidity) through the integration and feedback of electrical signals, and has wide application prospect in the aspects of intelligent robots, health monitoring, wearable equipment and man-machine interaction.
Among the various sensory functions of electronic skin, the tactile sensory function is particularly important. The flexible touch sensor is used as an important component of the electronic skin, the basic research of the flexible touch sensor has very important scientific significance and market value, and the detection type, sensitivity, response time, sensing interval, linearity and other device performances of the touch sensor are particularly important. Therefore, finding suitable sensing structures, sensitive materials, and simple manufacturing methods have become the hot spot of current research.
Disclosure of Invention
The invention aims to solve the problem of single detection function of the conventional flexible touch sensor and provides a preparation method of the flexible touch sensor based on a textile microstructure. The method carries out microstructure on the flexible substrate material by a textile microstructure template method, and changes the structure of a sensitive unit, thereby improving the sensitivity of the sensing device. The sensor can detect various tactile information such as stretching, pressure, bending in different directions and the like, and is convenient for realizing the complexity of the detection function of the same sensor in the future.
The technical scheme adopted by the invention is as follows:
a flexible touch sensor based on a textile microstructure is prepared from a PDMS material with the textile microstructure and a carbon nanotube conductive nanomaterial as a sensitive layer; the method sequentially comprises the following steps:
1) Horizontally fixing the fabric on the bottom of the container, ultrasonically cleaning with absolute ethanol, and then using N 2 Drying the surface of the glass;
the textile is natural fiber or chemical fiber;
warp yarns and weft yarns of the textile are interwoven according to the proportion of 1:1-1.5, and the thickness of single yarns is 10-100 mu m;
the natural fiber is cotton or hemp; the chemical fiber is polyester fiber, acrylic fiber or polyester fiber; the shape of the textile may be rectangular, square, circular, triangular, pentagonal, etc.
2) Injecting PDMS solution into the container in the step 1), immersing the textile, wherein the liquid level of the PDMS solution is 0.5-1 mm higher than the upper surface of the textile; then placing the substrate film in a vacuum drying oven for vacuumizing to remove bubbles, curing the substrate film at the temperature of 60-80 ℃ for 1.5-3 hours, and removing the cured PDMS film from the culture dish to obtain a flexible substrate film with a textile microstructure;
the PDMS solution is prepared by mixing PDMS prepolymer and curing agent according to the mass ratio of 10:1;
3) Coating carbon nano tube dispersion liquid on grooves with textile microstructures in the flexible substrate film obtained in the step 2) after ultraviolet ozone cleaning, placing the grooves on a heating plate, and naturally cooling the grooves to room temperature after annealing at the annealing temperature of 60-80 ℃ for 0.5-2 h to obtain the carbon nano tube microstructure flexible film;
wherein, every 1cm 2 Coating 0.5-2 mL of carbon nano tube dispersion liquid on the flexible substrate film groove; the mass percentage concentration of the carbon nano tube dispersion liquid is 15-25%; the pipe diameter of the carbon nano-tube is 30-50 nm, and the length is 10-20 mu m;
4) Attaching metal electrodes to the two end surfaces of the film microstructure obtained in the step 3), and coating the PDMS solution prepared in the step 2) on the surface of the flexible film for packaging to prepare the flexible touch sensor electronic device;
further, in step 2) is a SYLGARD 184 type silicone rubber manufactured by Dow Corning Corp, U.S.A., which is a two-component kit product consisting of liquid components, including a prepolymer and a curative. And (3) taking PDMS prepolymer and curing agent with the mass ratio of 10:1, and placing the PDMS prepolymer and curing agent in a test tube for uniformly mixing to obtain PDMS solution.
The metal electrode in the step 4) is a copper electrode, a gold electrode, a silver electrode or an aluminum electrode.
The flexible touch sensor device finally obtained in the step 4) can respectively detect the touch information such as stretching, pressure, bending in different directions and the like, has higher sensitivity, and has the sensitivity for the pressure of 2.35kPa ～1 The sensitivity coefficient GF value to tensile strain was 200, showing different trends in different bending directions.
The beneficial effects of the invention are as follows:
the flexible touch sensor device prepared by the invention does not need an additional functional layer, reduces the manufacturing cost, simplifies the process flow and improves the sensitivity to external touch stimulus. The detection of various strain tactile information such as stretching, pressure and bending directions is also realized respectively, wherein the pressure stimulus as low as 0.003mN can be detected, and the detection limit of the stretching strain is 35%. The flexible strain film with the textile microstructure is effectively obtained by reasonably controlling the structure and the size of the textile microstructure area of the sensitive layer, the selection and the thickness of the flexible film material, the types and the specifications of the conductive nano material and other parameters, so that the flexible touch sensing electronic device with high sensitivity, low energy consumption and multiple functions is prepared, and the flexible touch sensing electronic device has important significance for the development of the wearable field, the electronic skin and the soft-like robot.
Drawings
FIG. 1 is a schematic diagram of a flexible tactile sensor of the present invention.
Fig. 2 is an SEM image of the textile microstructure of the flexible tactile sensor obtained in example 1.
FIG. 3 is a resistance change response to tensile strain of the textile microstructure based multifunctional flexible tactile sensor obtained in example 1.
Fig. 4 is a resistance change response to pressure strain of the textile microstructure based multifunctional flexible tactile sensor obtained in example 1.
Detailed Description
The invention is illustrated below in connection with examples, but is not thereby limited to the scope of the examples.
Example 1:
(1) A rectangular adhesive tape with a textile microstructure of 5mm to 20mm is attached to a square culture dish with a specification of 10cm, and is ultrasonically cleaned with absolute ethyl alcohol, and then with N 2 And drying the surface of the glass.
The thickness of the spinning microstructure is about 40 mu m, and one surface of the spinning cotton cloth is provided with polypropylene adhesive with the thickness of about 60 mu m and is used for being attached and fixed in the middle of a culture dish to form a template for preparing the flexible substrate of the spinning microstructure.
(2) Mixing carbon nano tube slurry with the mass ratio of 1:5 with absolute ethyl alcohol, and then placing the mixture on a magnetic stirrer to be stirred until the mixture is uniformly dispersed, so as to prepare a carbon nano tube solution with the mass fraction of 20%, wherein the diameter of the carbon nano tube is 30-50 nm, and the length of the carbon nano tube is 10-20 mu m.
(3) And respectively taking 10g of PDMS prepolymer and 1g of curing agent according to the mass ratio of 10:1, and placing the mixture into a test tube to uniformly mix to obtain a PDMS solution. And then dripping all the prepared PDMS solution into a culture dish with a rectangular template with a textile microstructure, uniformly immersing the rectangular template and the bottom of the culture dish to a height of about 1mm, placing the culture dish in a vacuum drying oven, vacuumizing to remove bubbles, solidifying for 2 hours at a temperature of 70 ℃, and removing the solidified PDMS film from the culture dish to obtain a flexible substrate film with a rectangular groove with the textile microstructure, wherein the thickness of the film is about 1mm.
The PDMS solution is SYLGARD 184 type silicon rubber manufactured by Dow Corning Corp in the United states, and is a two-component kit product consisting of liquid components, including prepolymer and curing agent. And (3) taking PDMS prepolymer and curing agent with the mass ratio of 10:1, and placing the PDMS prepolymer and curing agent in a test tube for uniformly mixing to obtain PDMS solution.
(4) And (3) placing the obtained flexible substrate film with the textile microstructure in an ultraviolet ozone cleaning machine for treatment, taking 1ml of the dispersed carbon nanotube solution to uniformly coat the rectangular groove area of the textile microstructure of the flexible substrate, placing the film on a heating plate after coating, heating the film at the temperature of 70 ℃ for 1h, and naturally cooling the film to room temperature after annealing to obtain the flexible film with the textile microstructure of the carbon nanotube.
(5) Copper electrodes are attached to the two narrow end surfaces of the rectangular carbon nanotube area of the flexible film, and the PDMS solution prepared before is uniformly coated on the surface of the rectangular carbon nanotube area of the flexible film for packaging, so that the flexible touch sensor electronic device is prepared.
(6) The digital source meter is used for testing the electrical performance of the flexible touch sensor device, and the detection of the touch information by the flexible touch sensor is realized by adjusting different touch information such as stretching, strain, bending and the like applied to the sensor device.
Example 2:
(1) Prescription of 10 x 10cm specificationA rectangular adhesive tape with a textile microstructure of 5mm or 20mm is attached to a shaped petri dish, and is ultrasonically cleaned with absolute ethyl alcohol, and then with N 2 And drying the surface of the glass.
The thickness of the textile microstructure is about 50 mu m, and one surface of the textile cotton cloth is provided with polypropylene adhesive with the thickness of about 50 mu m and is used for being attached to the middle of a culture dish to form a template for preparing the flexible substrate of the textile microstructure.
(2) Mixing carbon nano tube slurry with the mass ratio of 1:5 with absolute ethyl alcohol, and then placing the mixture on a magnetic stirrer to be stirred until the mixture is uniformly dispersed, so as to prepare a carbon nano tube solution with the mass fraction of 20%, wherein the diameter of the carbon nano tube is 30-50 nm, and the length of the carbon nano tube is 10-20 mu m.
(3) And respectively taking 10g of PDMS prepolymer and 1g of curing agent according to the mass ratio of 10:1, and placing the mixture into a test tube to uniformly mix to obtain a PDMS solution. And then 7g of PDMS solution is dripped into a culture dish with a rectangular template with a textile microstructure, the rectangular template and the bottom of the culture dish are evenly immersed, the height is about 0.7mm, the culture dish is placed in a vacuum drying oven, the vacuum drying oven is vacuumized to remove bubbles, the culture dish is cured for 3 hours at the temperature of 60 ℃, and the cured PDMS film is removed from the culture dish, so that the flexible substrate film with the rectangular groove with the textile microstructure is obtained.
(4) And (3) placing the obtained flexible substrate film with the textile microstructure in an ultraviolet ozone cleaning machine for treatment, taking 1ml of the dispersed carbon nanotube solution to uniformly coat the rectangular groove area of the textile microstructure of the flexible substrate, placing the film on a heating plate after coating, heating the film at 70 ℃ for 1h, and naturally cooling the film to room temperature after annealing to obtain the flexible film with the textile microstructure of the carbon nanotube.
(5) Copper electrodes are attached to the two narrow end surfaces of the rectangular carbon nanotube area of the flexible film, and the PDMS solution prepared before is coated on the surface of the rectangular carbon nanotube area of the flexible film for packaging, so that the flexible touch sensor electronic device is prepared.
(6) The digital source meter is used for testing the electrical performance of the flexible touch sensor device, and the detection of the touch information by the flexible touch sensor is realized by adjusting different touch information such as stretching, strain, bending and the like applied to the sensor device.
Example 3:
(1) A square adhesive tape with a textile microstructure and 5 x 5mm is attached to a square culture dish with a specification of 10 x 10cm, and is ultrasonically cleaned by absolute ethyl alcohol, and then N is used for cleaning 2 And drying the surface of the glass.
The thickness of the textile microstructure is about 40 mu m, and one surface of the textile cotton cloth is provided with polypropylene adhesive with the thickness of about 60 mu m and is used for being attached to the middle of a culture dish to form a template for preparing the flexible substrate of the textile microstructure.
(2) Mixing carbon nano tube slurry with the mass ratio of 1:5 with absolute ethyl alcohol, and then placing the mixture on a magnetic stirrer to be stirred until the mixture is uniformly dispersed, so as to prepare a carbon nano tube solution with the mass fraction of 20%, wherein the diameter of the carbon nano tube is 30-50 nm, and the length of the carbon nano tube is 10-20 mu m.
(3) And respectively taking 10g of PDMS prepolymer and 1g of curing agent according to the mass ratio of 10:1, and placing the mixture into a test tube to uniformly mix to obtain a PDMS solution. And then dripping all the prepared PDMS solution into a culture dish with the square template with the textile microstructure, uniformly immersing the square template and the bottom of the culture dish to a height of about 1mm, placing the culture dish in a vacuum drying oven, vacuumizing to remove bubbles, solidifying for 2 hours at the temperature of 70 ℃, and removing the solidified PDMS film from the culture dish to obtain the flexible substrate film with the square groove with the textile microstructure.
(4) And (3) placing the obtained flexible substrate film with the textile microstructure in an ultraviolet ozone cleaning machine for treatment, taking 1ml of the dispersed carbon nanotube solution to uniformly coat the square groove area of the textile microstructure of the flexible substrate, placing the film on a heating plate after coating, heating the film at 70 ℃ for 1h, and naturally cooling the film to room temperature after annealing to obtain the flexible film with the textile microstructure of the carbon nanotube.
(5) Copper electrodes are attached to the surfaces of the opposite two ends of the square carbon nanotube area of the flexible film, and the PDMS solution prepared before is coated on the surface of the square carbon nanotube area of the flexible film for packaging, so that the flexible touch sensor electronic device is prepared.
(6) The digital source meter is used for testing the electrical performance of the flexible touch sensor device, and the detection of the touch information by the flexible touch sensor is realized by adjusting different touch information such as stretching, strain, bending and the like applied to the sensor device.
Example 4
(1) A square gauze template with a textile microstructure and 8mm is attached to a square culture dish with a specification of 5 x 5cm, ultrasonic cleaning is carried out by absolute ethyl alcohol, and then N is used for cleaning 2 And drying the surface of the glass.
The thickness of the textile microstructure is about 50 mu m, wherein one side of the textile is provided with polypropylene adhesive with the thickness of about 80 mu m, and the polypropylene adhesive is used for being fixedly attached to the middle of a culture dish to form a template for preparing the flexible substrate of the textile microstructure.
(2) Mixing carbon nano tube slurry with the mass ratio of 1:5 with absolute ethyl alcohol, and then placing the mixture on a magnetic stirrer to be stirred until the mixture is uniformly dispersed, so as to prepare a carbon nano tube solution with the mass fraction of 20%, wherein the diameter of the carbon nano tube is 30-50 nm, and the length of the carbon nano tube is 10-20 mu m.
(3) And respectively taking 5g of PDMS prepolymer and 0.5g of curing agent according to the mass ratio of 10:1, and placing the mixture into a test tube for uniformly mixing to obtain a PDMS solution. And then dripping all the prepared PDMS solution into a culture dish with a square template with a textile microstructure, uniformly immersing the square template and the bottom of the culture dish with the height of 1mm, placing the culture dish in a vacuum drying oven, vacuumizing to remove bubbles, solidifying for 2 hours at the temperature of 70 ℃, and removing the solidified PDMS film from the culture dish to obtain the flexible substrate film with the square groove with the textile microstructure.
(4) And (3) placing the obtained flexible substrate film with the textile microstructure in an ultraviolet ozone cleaning machine for treatment, taking 1ml of the dispersed carbon nanotube solution to uniformly coat the square groove area of the textile microstructure of the flexible substrate, placing the film on a heating plate after coating, heating the film at 70 ℃ for 1h, and naturally cooling the film to room temperature after annealing to obtain the flexible film with the textile microstructure of the carbon nanotube.
(5) Copper electrodes are attached to the two opposite end surfaces of the square area of the flexible thin film carbon nanotube, and the PDMS solution prepared before is coated on the surface of the area of the flexible thin film carbon nanotube for packaging, so that the flexible touch sensor electronic device is prepared.
(6) The digital source meter is used for testing the electrical performance of the flexible touch sensor device, and the detection of the touch information by the flexible touch sensor is realized by adjusting different touch information such as stretching, strain, bending and the like applied to the sensor device.
Example 5
(1) Attaching a circular gauze template with a diameter of 8mm and a textile microstructure into a square culture dish with a specification of 5cm, ultrasonically cleaning the square culture dish with absolute ethyl alcohol, and then using N 2 And drying the surface of the glass.
The thickness of the textile microstructure is about 40 mu m, wherein one side of the textile is provided with polypropylene adhesive with the thickness of about 80 mu m, and the polypropylene adhesive is used for being fixedly attached to the middle of a culture dish to form a template for preparing the flexible substrate of the textile microstructure.
(2) Mixing carbon nano tube slurry with the mass ratio of 1:5 with absolute ethyl alcohol, and then placing the mixture on a magnetic stirrer to be stirred until the mixture is uniformly dispersed, so as to prepare a carbon nano tube solution with the mass fraction of 20%, wherein the diameter of the carbon nano tube is 30-50 nm, and the length of the carbon nano tube is 10-20 mu m.
(3) And respectively taking 5g of PDMS prepolymer and 0.5g of curing agent according to the mass ratio of 10:1, and placing the mixture into a test tube for uniformly mixing to obtain a PDMS solution. And then dripping all the prepared PDMS solution into a culture dish with a circular template with a textile microstructure, uniformly immersing the circular template and the bottom of the culture dish with the height of 1mm, placing the culture dish in a vacuum drying oven, vacuumizing to remove bubbles, solidifying for 2 hours at the temperature of 70 ℃, and removing the solidified PDMS film from the culture dish to obtain the flexible substrate film with the circular groove with the textile microstructure.
(4) And (3) placing the obtained flexible substrate film with the textile microstructure in an ultraviolet ozone cleaning machine for treatment, taking 1ml of the dispersed carbon nanotube solution to uniformly coat the circular groove area of the textile microstructure of the flexible substrate, placing the film on a heating plate after coating, heating the film at 70 ℃ for 1h, and naturally cooling the film to room temperature after annealing to obtain the flexible film with the textile microstructure of the carbon nanotube.
(5) Copper electrodes are attached to the surfaces of two ends of one diameter of the flexible film circular carbon nanotube area, and the PDMS solution prepared before is coated on the surface of the flexible film carbon nanotube area for packaging, so that the flexible touch sensor electronic device is prepared.
(6) The digital source meter is used for testing the electrical performance of the flexible touch sensor device, and the detection of the touch information by the flexible touch sensor is realized by adjusting different touch information such as stretching, strain, bending and the like applied to the sensor device.
Specific experimental results:
1. the shapes and specifications of different textile microstructure areas, different textile raw materials, curing time and curing temperature of different flexible substrate materials, different electrode materials and attaching methods have great influence on the acquisition of the flexible sensing film, and experiments find that the high-sensitivity and multifunctional flexible touch sensing film can be prepared by accurately regulating and controlling the experimental parameters.
2. Experiments flexible tactile sensor devices based on textile microstructures were successfully fabricated by preparing templates of different textile microstructures and sizes, the device structure is schematically shown in fig. 1, and SEM images of the textile microstructures of example 1 are shown in fig. 2. The device with the structure has certain detectability to different external touch stimuli, and realizes the multifunctional detection of different touch information such as stretching, pressure and bending.
Fig. 3 and 4 show the multi-functional detection performance of the carbon nanotube-based textile microstructured flexible film of example 1 of the present invention for different tactile information, i.e., stretching and pressure, respectively. Wherein for pressure information, sensingThe device shows a trend of decreasing resistance along with increasing applied pressure, and the sensitivity of the device to pressure touch information detection can reach 2.35kPa ～1 The method comprises the steps of carrying out a first treatment on the surface of the For the tensile strain tactile information, the resistance of the sensor tends to increase along with the increase of the tensile strain, and the sensitivity coefficient GF for detecting the tensile strain tactile information reaches 200; for bending behaviors in different directions, when the sensor is bent downwards, the resistor shows an increasing trend, when the sensor is bent upwards, the resistor shows a decreasing trend, and the sensor resistor also shows two different increasing and decreasing changing trends for bending in different directions respectively, so that the sensor has detectability for the bending direction. Fig. 3 and 4 illustrate: the flexible touch sensing device successfully realizes the detection function of different touch information (pressure and stretching). The bench for tensile and compressive testing performed by the experiment was the MARK10ESM303 electronic tensile bench. When the device is subjected to bending test, the sensing film is required to be attached to a bending carrier, and the PET film with the thickness of 0.2mm is used for simulating the bending state of the wearable electronic equipment.
The detection result shows that the flexible touch sensing film prepared by the method is stable in property and can be repeatedly used for a plurality of times, is successfully applied to the field of flexible touch sensing, and simultaneously provides some foundations for more functional integrated wearable devices.
The invention is not a matter of the known technology.

Claims (3)

1. A method for preparing a flexible touch sensor based on a textile microstructure, which is characterized by comprising the following steps:
1) Horizontally fixing the fabric on the bottom of the container, ultrasonically cleaning with absolute ethanol, and then using N 2 The surface of the material is dried,
the textile is natural fiber or chemical fiber; warp yarns and weft yarns of the textile are interwoven according to a proportion of 1:1-1.5, and the thickness of single yarns is 10-100 mu m;
2) Injecting PDMS solution into the container in the step 1), immersing the textile, wherein the liquid level of the PDMS solution is 0.5-1 mm higher than the upper surface of the textile, then placing the textile in a vacuum drying oven, vacuumizing to remove bubbles, curing for 1.5-3 hours at the temperature of 60-80 ℃, and removing the cured PDMS film from the culture dish to obtain the flexible substrate film with grooves of the textile microstructure;
the PDMS solution is prepared by mixing PDMS prepolymer and curing agent according to the mass ratio of 10:1;
3) After cleaning the flexible substrate film obtained in the step 2) by ultraviolet ozone, coating carbon nano tube dispersion liquid in a groove with a textile microstructure, placing the groove on a heating plate, and naturally cooling the groove to room temperature after annealing at the annealing temperature of 60-80 ℃ for 0.5-2 h to obtain the carbon nano tube textile microstructure flexible film;
wherein, every 1cm 2 Coating 0.5-2 mL of carbon nanotube dispersion liquid on the flexible substrate film groove, wherein the mass percentage concentration of the carbon nanotube dispersion liquid is 15-25%;
4) Respectively attaching metal electrodes to the surfaces of two ends of the film microstructure obtained in the step 3), and packaging to obtain a flexible touch sensor;
the natural fiber is cotton or hemp; the chemical fiber is polyester fiber, acrylic fiber or polyester fiber;
the pipe diameter of the carbon nano-tube is 30-50 nm, and the length is 10-20 mu m;
the metal electrode in the step 4) is a copper electrode, a gold electrode, a silver electrode or an aluminum electrode;
and the packaging in the step 4) is to coat the PDMS solution prepared in the step 2) on the surface of the flexible film.
2. The method for manufacturing a flexible tactile sensor based on textile microstructures as in claim 1 wherein the textile is rectangular, square, circular, triangular, pentagonal or pentagonal in shape.
3. The method of manufacturing a flexible tactile sensor based on textile microstructures as in claim 1 wherein said PDMS solution in step 2) is SYLGARD 184 silicone rubber manufactured by Dow Corning Corp in the united states, which is a two-component kit of liquid components comprising a prepolymer and a curing agent.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972734A1 (en) * 1998-07-17 2000-01-19 L.G.L. Electronics S.p.A. Device for modulated braking of a weft yarn for textile machines
CN104287698A (en) * 2014-09-16 2015-01-21 苏州能斯达电子科技有限公司 Flexible and attachable sensor used for neck pulse detection and manufacturing method of flexible and attachable sensor used for neck pulse detection
CN106500886A (en) * 2016-09-22 2017-03-15 太原理工大学 A kind of preparation method of the flexibility stress sensor based on nanometer conductive material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972734A1 (en) * 1998-07-17 2000-01-19 L.G.L. Electronics S.p.A. Device for modulated braking of a weft yarn for textile machines
CN104287698A (en) * 2014-09-16 2015-01-21 苏州能斯达电子科技有限公司 Flexible and attachable sensor used for neck pulse detection and manufacturing method of flexible and attachable sensor used for neck pulse detection
CN106500886A (en) * 2016-09-22 2017-03-15 太原理工大学 A kind of preparation method of the flexibility stress sensor based on nanometer conductive material

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