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Preparation method of CNT/PDMS flexible composite material and capacitive pressure sensor

A composite material and capacitive technology, applied in the direction of chemical instruments and methods, instruments, measuring force, etc., can solve the problems of porous sponge falling off, the difficulty of penetrating conductive materials of sensors, and the difficulty of obtaining high sensitivity and stability of sensors, etc., to achieve Reduced surface energy, good sensitivity and durability, reduced agglomeration effects

Pending Publication Date: 2022-05-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, flexible pressure sensors generally prepare porous PDMS first, and then absorb conductive materials by evaporation, sputtering or dip coating. Easy to fall off from the surface, especially after frequent compression operations, it is difficult to obtain high sensitivity and stable performance of the sensor

Method used

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  • Preparation method of CNT/PDMS flexible composite material and capacitive pressure sensor
  • Preparation method of CNT/PDMS flexible composite material and capacitive pressure sensor
  • Preparation method of CNT/PDMS flexible composite material and capacitive pressure sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]The flexible matrix material selected in this embodiment is polydimethylsiloxane PDMS, PDMS is a typical silicone rubber material, has a silicon-oxygen bond (Si-O) with a helical structure, and all side groups are methyl groups, PDMS silicon oxide The bonds have large bond angles, so they are prone to rotation, resulting in good flexibility. PDMS is a thermosetting material, which is divided into a main body and a curing agent. The main body is a siloxane oligomer, and the curing agent is a siloxane crosslinking agent. The two components can be crosslinked under heating conditions. Since there are multiple reaction sites between the main body of PDMS and the curing agent, it can be cured and formed under the action of heat after being fully mixed.

[0049] In this example, PDMS is used instead of water, and carbon nanotubes CNT and sugar particles are fully mixed, and PDMS sponge and curing agent are added, and after fully stirring, use a tablet press for tableting, and ...

Embodiment 2

[0071] In this embodiment, the preparation method of the CNT / PDMS flexible composite material as in the first embodiment is adopted, and a capacitive flexible sensor is formed. The capacitive flexible sensor is formed by connecting and assembling the CNT / PDMS flexible composite material and wires. Specifically, the prepared CNT / PDMS flexible composite material is placed on the work table, and the upper and lower sides of the conductive sponge are covered with conductive tape. The surface and lead out the tested electrodes to obtain a capacitive flexible sensor.

[0072] Sensitivity refers to the sensitivity of the sensor to the stimulus when it is stimulated by external pressure, which is mainly judged by the slope of the △R / R0 curve. In this embodiment, the sensitivity of the sensor is tested, and the influence of different concentrations of carbon nanotubes on the sensitivity of the flexible resistive pressure sensor is compared. The sensitivity test method of the sensor in...

Embodiment 3

[0084]It can be obtained from Examples 1 and 2 that the CNT / PDMS capacitive flexible sensor has the highest sensitivity when the carbon nanotube doping concentration is 5 wt%. In this embodiment, weights and an electrochemical workstation are used to test the response time of the flexible pressure sensor, the sensor and the electrochemical workstation are used to form a series circuit, and then the i-t test program is selected in the program of the electrochemical workstation, and the weight is placed on the flexible pressure sensor. On the pressure sensor, record the response time of the flexible pressure sensor to the weight.

[0085] In this embodiment, the capacitive flexible sensor with the highest sensitivity doped carbon nanotubes concentration of 5wt% is selected for response and recovery test, and the response time and recovery time when the pressure is 1kPa, 2.5kPa and 5kPa are tested. The result is as Figure 6 shown, where Figure 6 (a)-(c) show the response and ...

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Abstract

The invention discloses a preparation method of a CNT / PDMS flexible composite material, which comprises the following steps: fully mixing CNT modified by a strong acid oxidation method with sugar particles, adding PDMS sponge and a curing agent, fully stirring, tabletting by using a tabletting machine, putting a sample into a drying oven, heating and curing for a certain time, and taking out the sample to obtain the CNT / PDMS flexible composite material. And taking out the sample, and putting the sample into water to melt the sugar, thereby preparing the CNT / PDMS flexible composite material. The carbon nanotubes are brought into the PDMS matrix through the sugar particles, so that the phenomenon of agglomeration among the nanotubes is reduced, the carbon nanotube particles are favorably combined with the polymer matrix and are uniformly dispersed in the flexible matrix PDMS, the sensitivity and durability are good, and stable capacitance response is ensured.

Description

technical field [0001] The invention relates to the technical field of flexible pressure sensors, in particular to a preparation method of a CNT / PDMS flexible composite material and a capacitive pressure sensor. Background technique [0002] Carbon nanotubes have excellent mechanical properties and are one of the most rigid materials known, and the tensile strength and modulus of elasticity of carbon nanotubes are the largest among currently known materials. From the perspective of electrical properties, carbon nanotubes have good electrical conductivity, and also have superconducting properties at low temperature. From the perspective of thermal performance, the thermal conductivity of carbon nanotubes also has anisotropic characteristics. In addition, there are many excellent properties of carbon nanotubes, such as adsorption, hydrogen storage and optical properties, and it is precisely because of these excellent properties that carbon nanotubes have become a research hot...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K9/02C08K3/04C08K9/04C01B32/168G01L1/14
CPCC08K9/02C08K3/041C08K9/04G01L1/146C01B32/168C08K2201/011C08K2201/001C08L83/04
Inventor 林红任孟陈宇岳张德锁
Owner SUZHOU UNIV
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