CN102732039A - Graphene-based pressure-sensitive material for flexible tactile sensor and method for preparing same - Google Patents
Graphene-based pressure-sensitive material for flexible tactile sensor and method for preparing same Download PDFInfo
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- CN102732039A CN102732039A CN2012102436389A CN201210243638A CN102732039A CN 102732039 A CN102732039 A CN 102732039A CN 2012102436389 A CN2012102436389 A CN 2012102436389A CN 201210243638 A CN201210243638 A CN 201210243638A CN 102732039 A CN102732039 A CN 102732039A
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Abstract
The invention discloses a graphene-based pressure-sensitive material for a flexible tactile sensor and a method for preparing the same. The graphene-based pressure-sensitive material for the flexible tactile sensor is characterized by being prepared from the following raw materials by weight: 100 parts of liquid organic silicon, 2 parts of graphene, 4 parts of carbon black and 10 parts of a dispersing agent. The graphene-based pressure-sensitive material for the flexible tactile sensor has the advantages of good pressure-sensing function and good flexibility.
Description
Technical field
The present invention relates to a kind of flexible touch sensation sensor pressure sensitive material and preparation method.
Background technology
At present, the sensitive material that is used for pressure transmitter mainly is metal, MOX or semiconductor material etc., and these several types of materials do not have snappiness.People constantly attempt utilizing different principles and material different for many years, develop flexible touch sensation sensor.But the common problem that exists of all kinds of existing flexible touch sensation sensors comprises:
1, on material chosen, material itself can not have good pressure sensing function and snappiness concurrently, and cost is high;
2, on the layout of sensor array array structure, because selected material array structural requirement is high, mainly be applicable to rigidity, built-up type array structure, can not be applicable to the tactile sensor array of any design, the scope of application is little;
3, on manufacture craft, existing flexible touch sensation sensor research mainly is to use MEMS technology and layering manufacturing technology etc., and manufacturing process requirement is high, and cost is big.
Since peace moral strong K sea nurse (Andre Geim) professor in 2004 and the good. Nuo Woxieluofu of Coase (Kostya Novoselov) researcher prepared Graphene (GNPs) first, Graphene had received whole world scientist's extensive concern.Undoubtedly, Graphene is the another great discovery behind CNT, fullerene ball.Six side's honeycomb two-dirnentional structures that Graphene is made up of the monolayer carbon atom, purified Graphene is a kind of xln that has only an atom thick, has characteristics such as ultra-thin, ultra firm and superpower conductivity.Graphene has thermal property, mechanical property and the electric property more excellent than carbon nanotube, has great application prospect in the conducing composite material field.But in flexible touch sensation sensor pressure sensitive material and preparation thereof, do not see relevant report at present.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of flexible touch sensation sensor pressure sensitive material and preparation method based on Graphene who has good pressure sensing function and snappiness concurrently, is applicable to the tactile sensor array of any design being provided.
The characteristics that the present invention is based on the flexible touch sensation sensor pressure sensitive material of Graphene are: raw material by weight consists of:
Liquid organosilicon: 100 parts;
Graphene: 1-3 part;
Carbon black: 3-5 part;
Dispersion agent: 10 parts.
The characteristics that the present invention is based on the flexible touch sensation sensor pressure sensitive material of Graphene also are:
Said liquid organosilicon is monocomponent room-temperature cured fluid silicone rubber RTV GD40 or is two component YSR 3286 PDMS DC-184.
Said Graphene mean thickness is 4-20nm, the number of plies<30, mean diameter is that 5-10 μ m, resistivity are 4 * 10
-4Ω cm.
Said carbon black is a CB3100 type carbon black, and mean particle size is that 30nm, specific surface area are 1100m
2/ g, apparent density are 0.128g/cm
3, resistivity is 5 * 10
-3Ω cm.
Said dispersion agent is that density is 650～750kg/m
3The distillation petroleum naphtha.
Preparing method's the characteristics that the present invention is based on the flexible touch sensation sensor pressure sensitive material of Graphene are to carry out as follows:
A, under normal temperature, normal pressure, with Graphene, carbon black and dispersion agent ultra-sonic dispersion 30-40 minute dispersion soln;
B, monocomponent room-temperature cured fluid silicone rubber RTV GD40 is added in the dispersion soln of step a gained, ultra-sonic dispersion 25 minutes, carry out again mechanical stirring 25 minutes mixing solutions; The gained mixing solutions is curing molding at room temperature;
Or be:
A, under normal temperature, normal pressure, with Graphene, carbon black and dispersion agent ultra-sonic dispersion 30-40 minute dispersion soln;
B, the A agent among two component YSR 3286 PDMS DC-184 is added in the dispersion soln, ultra-sonic dispersion or mechanical stirring 25 minutes, mixed liquor A;
C, in said mixed liquor A, add the B agent among two component YSR 3286 PDMS DC-184, through ultra-sonic dispersion 25 minutes again mechanical stirring 25 minutes mixing solutions B; Gained mixing solutions B is curing molding at room temperature.
In order effectively to improve the compatibility of sensitive material on pressure sensing function and snappiness; The present invention selects for use the good liquid organosilicon of snappiness behind the curing molding as body material; Mix through filler, when guaranteeing this material tactile sensing function, further improve its flexibility.The present invention adopts the method for liquid silicone moulding; Can sensitive material solution be filled in the pressure sensor structure model of any design through curing molding; Improve pliable pressure sensor senses function and flexible compatibility very effectively, be suitable for the pressure sensor structure of design arbitrarily.Compared with present technology, beneficial effect of the present invention is embodied in:
1, the present invention adopts liquid organosilicon as body material, and the organosilicon behind the curing molding has fine flexibility, has guaranteed the flexibility of pressure sensitive material;
2, the present invention adopts Graphene, carbon black as conductive filler material, because Graphene has good two-dimensional structure, bigger depth-width ratio and good snappiness, has certain flexibility when making pressure sensitive material have good presser sensor characteristic.Add carbon black, can form synergy, the conductive path between conducting particles is formed more easily with Graphene;
3, the present invention select for use Graphene, carbon black as conductive filler material and organosilicon as body material; Compare the flexible tactile pressure sensitive material of other carbonaceous material filled silicon rubbers; For example based on carbon nanotube and carbon black blended flexible touch sensation sensor material with based on sooty flexible touch sensation sensor material; The pressure stability and the range of material have been improved effectively, like Fig. 4, Fig. 5.Shown in Figure 4, it is to reduce along with the increase of pressure that the resistance of three kinds of matrix materials changes relatively, presents the negative pressure inhibition effect.But Graphene-carbon black/silicon rubber composite material rational curve in the pressure range of 0 ~ 55N, be approximated to linearity, carbon nanotube and carbon black filled Zylox and carbon black filled silicon rubber composite material are only better at the pressure range internal linear degree of 0 ~ 25N.Like Fig. 4, the range ability of Graphene and carbon black mixing filled silicon rubber is 0 ~ 55N, and the range of carbon nanotube and carbon black filled Zylox and carbon black filled Zylox is respectively 0 ~ 40N and 0 ~ 35N.This shows, Graphene with respect to the carbon black of identical loading level, carbon nanotube to being that the linear lag and the range of the matrix material of matrix plays certain improvement effect with Zylox.
Pressure sensitive material to obtaining carries out the stability test analysis respectively under the pressure of 5N, 20N; The result is respectively shown in Fig. 5 a and Fig. 5 b; Under two kinds of pressure; The time dependent stability of carbon black filled Zylox resistance is the poorest, and the beta stability line of Graphene and carbon black mixing filled silicon rubber almost is a straight line parallel with time shaft, shows fabulous stability.This shows, Graphene with respect to the carbon black of identical loading level, carbon nanotube to being that the stability of the matrix material of matrix also plays certain improvement effect with Zylox.
4, the present invention adopts the method for liquid silicone moulding; Make material of the present invention can be applied to widened its applicable scope, and this method technology be simple in the pressure sensor structure model of design arbitrarily; Easy to operate, the while has also been reduced the cost of pliable pressure transmitter.
Description of drawings
Fig. 1 is the pressure drag rational curve of embodiment 1,2,3;
Fig. 2 is the SEM figure of embodiment 2;
Fig. 3 is the FETEM figure of embodiment 2;
Fig. 4 be embodiment 2 with equal in quality mark, same process under carbon nanotube, the pressure drag rational curve of carbon black silicon rubber composite material;
Fig. 5 a is the carbon nanotube under embodiment 2 and equal in quality mark, the same process, the beta stability line of carbon black silicon rubber composite material under the 5N pressure;
Fig. 5 b is the carbon nanotube under embodiment 2 and equal in quality mark, the same process, the beta stability line of carbon black silicon rubber composite material under the 20N pressure.
Embodiment
In the practical implementation, consist of based on the flexible touch sensation sensor pressure sensitive material raw material by weight of Graphene: liquid organosilicon: 100 parts; Graphene: 1-3 part; Carbon black: 3-5 part; Dispersion agent: 10 parts.Wherein:
Liquid organosilicon is monocomponent room-temperature cured fluid silicone rubber RTV GD40 or is two component YSR 3286 PDMSDC-184; The Graphene mean thickness is 4-20nm, the number of plies<30, mean diameter is that 5-10 μ m, resistivity are 4 * 10
-4Ω cm; Carbon black is a CB3100 type carbon black, and mean particle size is that 30nm, specific surface area are 1100m
2/ g, apparent density are 0.128g/cm
3, resistivity is 5 * 10
-3Ω cm; Dispersion agent is that density is 650～750kg/m
3The distillation petroleum naphtha.
In the practical implementation, carry out as follows based on the preparation method of the flexible touch sensation sensor pressure sensitive material of Graphene:
1, under normal temperature, normal pressure, Graphene, carbon black and dispersion agent are utilized FS-150 ultrasonication appearance ultra-sonic dispersion 30-40 minute, make no obvious particle in the solution, get dispersion soln;
2, monocomponent room-temperature cured fluid silicone rubber RTV GD40 is added in the dispersion soln of step 1 gained, utilizes FS-150 ultrasonication appearance to carry out ultra-sonic dispersion 25 minutes, and then utilize the magneton stirrer carry out mechanical stirring 25 minutes mixing solutions; The gained mixing solutions is curing molding at room temperature, and molding time is 65 hours;
Or be:
1, under normal temperature, normal pressure, Graphene, carbon black and dispersion agent are utilized FS-150 ultrasonication appearance ultra-sonic dispersion 30-40 minute, make no obvious particle in the solution, promptly get dispersion soln;
2, the A agent among two component YSR 3286 PDMS DC-184 is added in the dispersion soln, utilized FS-150 ultrasonication appearance ultra-sonic dispersion 25 minutes, and then utilize magneton stirrer machinery to stir 25 minutes, get mixed liquor A;
3, in mixed liquor A, add B agent among two component YSR 3286 PDMS DC-184, again through FS-150 ultrasonication appearance ultra-sonic dispersion 25 minutes, and then utilize magneton stirrer machinery stirred 25 minutes mixing solutions B; Gained mixing solutions B is curing molding at room temperature, and molding time is 65 hours.
Embodiment 1:
Getting monocomponent room-temperature cured fluid silicone rubber RTV GD401 by weight is 100 parts; Graphene is 1 part; Carbon black is 5 parts, and dispersion agent is 10 parts.Wherein, the Graphene mean thickness is 4 ~ 20nm, the number of plies<30, mean diameter is 5 ~ 10 μ m, and resistivity is 4 * 10
-4Ω cm; The carbon black mean particle size is 30nm, and specific surface area is 1100m
2/ g, apparent density is 0.128g/cm
3, resistivity is 5 * 10
-3Ω cm; Dispersion agent is that density is 650～750kg/m
3The distillation petroleum naphtha.
Preparation process: under normal temperature, normal pressure, Graphene, carbon black and dispersion agent are utilized FS-150 ultrasonication appearance ultra-sonic dispersion 40 minutes, make no obvious particle in the solution, get dispersion soln; Again fluid silicone rubber RTV GD401 is added in this dispersion soln, utilizes FS-150 ultrasonication appearance to carry out ultra-sonic dispersion 25 minutes, and then utilize the magneton stirrer carry out mechanical stirring 25 minutes mixing solutions; The gained mixing solutions is curing molding at room temperature, and molding time is 65 hours.
Conclusion: curve a can find out from Fig. 1, and Graphene and carbon black filled silicon rubber composite material resistance value reduce along with the increase of pressure, and the linear lag is good within the specific limits, and be highly sensitive.
Embodiment 2:
Getting monocomponent room-temperature cured fluid silicone rubber RTV GD401 by weight is 100 parts; Graphene is 2 parts; Carbon black is 4 parts, and dispersion agent is 10 parts.Wherein, the Graphene mean thickness is 4 ~ 20nm, the number of plies<30, mean diameter is 5 ~ 10 μ m, and resistivity is 4 * 10
-4Ω cm; The carbon black mean particle size is 30nm, and specific surface area is 1100m
2/ g, apparent density is 0.128g/cm
3, resistivity is 5 * 10
-3Ω cm; Dispersion agent is that density is 650～750kg/m
3The distillation petroleum naphtha.
Preparation process such as embodiment 1.
Conclusion: the b curve can be found out from Fig. 1, and Graphene and carbon black mixing filled silicon rubber composite material resistance value reduce along with the increase of pressure, and is the approximately linear variation, and sensitivity is higher; As can beappreciated from fig. 2, Graphene and carbon black are at the certain conductive network of the inner formation of Zylox.
Embodiment 3:
Getting monocomponent room-temperature cured fluid silicone rubber RTV GD401 by weight is 100 parts; Graphene is 3 parts; Carbon black is 3 parts, and dispersion agent is 10 parts.Wherein, the Graphene mean thickness is 4 ~ 20nm, the number of plies<30, mean diameter is 5 ~ 10 μ m, and resistivity is 4 * 10
-4Ω cm; The carbon black mean particle size is 30nm, and specific surface area is 1100m
2/ g, apparent density is 0.128g/cm
3, resistivity is 5 * 10
-3Ω cm; Dispersion agent is that density is 650～750kg/m
3The distillation petroleum naphtha.
Preparation process such as embodiment 1.
Conclusion: curve c can find out from Fig. 1, and Graphene and carbon black mixing filled silicon rubber composite material resistance value reduce along with the increase of pressure, and the linear lag is fine in certain scope, and is highly sensitive.
Pressure sensitive material to obtaining carries out presser sensor characteristic test and scanning electron microscope analysis, the rational curve that the result of presser sensor characteristic test is as shown in Figure 1, scanning electron microscope analysis such as Fig. 2.Can know by Fig. 1, along with the increase of pressure, the resistance value of Graphene and carbon black mixing filled silicon rubber, and be the approximately linear variation, and the linear lag of curve b is good, highly sensitive.Can be known that by Fig. 2 Graphene and carbon black are at the certain conductive network of the inner formation of Zylox, conducting particles can transmit in this network.
Claims (6)
1. based on the flexible touch sensation sensor pressure sensitive material of Graphene, it is characterized in that: raw material by weight consists of:
Liquid organosilicon: 100 parts;
Graphene: 1-3 part;
Carbon black: 3-5 part;
Dispersion agent: 10 parts.
2. the flexible touch sensation sensor pressure sensitive material based on Graphene according to claim 1 is characterized in that said liquid organosilicon is monocomponent room-temperature cured fluid silicone rubber RTV GD40 or is two component YSR 3286 PDMSDC-184.
3. the flexible touch sensation sensor pressure sensitive material based on Graphene according to claim 1 is characterized in that said Graphene mean thickness is 4-20nm, the number of plies<30, mean diameter is that 5-10 μ m, resistivity are 4 * 10
-4Ω cm.
4. the flexible touch sensation sensor pressure sensitive material based on Graphene according to claim 1 is characterized in that said carbon black is a CB3100 type carbon black, and mean particle size is that 30nm, specific surface area are 1100m
2/ g, apparent density are 0.128g/cm
3, resistivity is 5 * 10
-3Ω cm.
5. the flexible touch sensation sensor pressure sensitive material based on Graphene according to claim 1 is characterized in that said dispersion agent is that density is 650～750kg/m
3The distillation petroleum naphtha.
6. the preparation method of the described flexible touch sensation sensor pressure sensitive material based on Graphene of a claim 1 is characterized in that carrying out as follows:
A, under normal temperature, normal pressure, with Graphene, carbon black and dispersion agent ultra-sonic dispersion 30-40 minute dispersion soln;
B, monocomponent room-temperature cured fluid silicone rubber RTV GD40 is added in the dispersion soln of step a gained, ultra-sonic dispersion 25 minutes again mechanical stirring 25 minutes mixing solutions; The gained mixing solutions is curing molding at room temperature;
Or be:
A, under normal temperature, normal pressure, with Graphene, carbon black and dispersion agent ultra-sonic dispersion 30-40 minute dispersion soln;
B, the A agent among two component YSR 3286 PDMS DC-184 is added in the dispersion soln, ultra-sonic dispersion 25 minutes is mechanical stirring 25 minutes again, mixed liquor A;
C, in said mixed liquor A, add the B agent among two component YSR 3286 PDMS DC-184, through ultra-sonic dispersion 25 minutes again mechanical stirring 25 minutes mixing solutions B; Gained mixing solutions B is curing molding at room temperature.
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| CN106568539A (en) * | 2016-10-20 | 2017-04-19 | 上海交通大学 | Polymer substrate-based monolithic integrated temperature and humidity flexible sensor and preparation method |
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