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Wearable flexible capacitive pressure sensor and preparation method thereof

A pressure sensor, flexible capacitor technology, applied in the direction of sensors, chemical instruments and methods, instruments, etc.

Pending Publication Date: 2020-08-18
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unique three-dimensional structure of GA can effectively overcome the disadvantage of easy agglomeration between graphene sheets, but in the existing research, graphene airgel is rarely used as a conductive filler in the dielectric layer of capacitive pressure sensors.

Method used

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  • Wearable flexible capacitive pressure sensor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of graphene airgel;

[0049]Firstly, graphene oxide (GO) flakes were dispersed in deionized water and sonicated to prepare GO flake suspension (6 -1 ), then the GO flake suspension was reduced with L-ascorbic acid (the concentration ratio of L-ascorbic acid to GO suspension was 1:1), the mixture was sealed in a vial, and heated in an oil bath at 120 °C without any stirring. Heat treatment at ℃ for 4h;

[0050] In the next step, the obtained hydrogel was washed with deionized water, and finally, the hydrogel was first frozen for 20 h, and then freeze-dried for 48 h to obtain graphene airgel.

[0051] Preparation of 051GA / polydimethylsiloxane sponge;

[0052] The GA obtained in the step (1) is pulverized to the micron level, the fragmented GA is uniformly dispersed in ethanol, and the polydimethylsiloxane main agent is added to the GA suspension (the weight ratio of GA to PDMS solution is 10 / 1000), and heated at 80°C until the ethanol evaporates completely,...

Embodiment 2

[0057] 1) Preparation of graphene airgel;

[0058] GO flake suspension (10 mg ml -1 ), then the GO flake suspension was reduced with glucose (the concentration ratio of glucose to GO suspension was 5:1), the mixture was sealed in a vial, and heat-treated in an oil bath at 200 °C for 1 h without any stirring;

[0059] In the next step, the obtained hydrogel was washed with deionized water, and finally, the hydrogel was first frozen for 40 h, and then freeze-dried for 24 h to obtain graphene airgel.

[0060] 2) Preparation of GA / Ecoflex sponge;

[0061] The GA obtained in step (1) was pulverized to micron level. The fragmented GA was uniformly dispersed in ethanol, the Ecoflex solution was added to the GA suspension (the weight ratio of GA to Ecoflex solution was 50 / 1000), and heated at 120 °C until the ethanol evaporated completely. After cooling, add benzoyl peroxide to the mixed solution, and select sugar template technology to foam the polymer. After the sugar and polyme...

Embodiment 3

[0065] Preparation of graphene airgel;

[0066] Firstly, graphene oxide (GO) flakes were dispersed in deionized water and sonicated to prepare GO flake suspension (8 -1 ), then reduce the GO flake suspension with sodium citrate (concentration ratio of sodium citrate to GO suspension is 2:1), seal the mixture in a vial, and place it in an oil bath at 180°C without any stirring. Heat treatment at ℃ for 2h;

[0067] In the next step, the resulting hydrogel was washed with deionized water. Finally, the hydrogel was frozen for 30 h, and then freeze-dried for 36 h to obtain the graphene aerogel.

[0068] Preparation of GA / polyurethane sponge;

[0069] The GA obtained in step (1) was pulverized to micron level. The fragmented GA was uniformly dispersed in ethanol, the polyurethane solution was added to the GA suspension (the weight ratio of GA to polyurethane solution was 20 / 1000), and heated at 100 °C until the ethanol evaporated completely. After cooling, add sodium lauryl sul...

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Abstract

The invention relates to the technical field of flexible electronics, in particular to a wearable flexible capacitive pressure sensor and a preparation method thereof. The structure of the wearable flexible capacitive pressure sensor comprises an upper electrode, a dielectric layer, a bottom electrode and a wire; the upper electrode and the bottom electrode are composed of polyimide matrixes and electrodes, and the wires are attached to the polyimide substrate and connected with the electrodes, wherein the dielectric layer is formed by mixing a compressible polymer matrix and a conductive filler, and the polymer matrix has an internal microstructure; the graphene aerogel is a conductive filler and is applied to a dielectric layer of a flexible capacitive pressure sensor. Compared with theprior art, the capacitance pressure sensor structure based on the electronic skin technology improves the capacitance value of the pressure sensor, improves the sensitivity of the sensor, and is widely applied to electronic skin as wearable electronic equipment to monitor human body health.

Description

technical field [0001] The invention relates to the technical field of flexible electronics, in particular to a wearable flexible capacitive pressure sensor and a preparation method thereof. Background technique [0002] Electronic skin and flexible wearable devices are two important components of flexible electronics technology, and people's interest in artificial intelligence, human-machine interface and prosthetic skin has led to the development of electronic skin. Flexible wearable devices have great potential in healthcare and other care, and high-performance flexible sensors are the key to realize electronic skin and wearable devices. [0003] Flexible pressure sensors have been widely used in applications such as e-skin, artificial intelligence, and wearable devices. Pressure sensors with light weight, high sensitivity, wide pressure range, low detection limit, low cost, and scalability will play an important role in current and future portable and It is very much ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/14B32B33/00B32B27/28B32B27/08B32B3/26B32B3/08A61B5/00
CPCA61B5/6801A61B5/6843B32B3/085B32B3/26B32B5/18B32B27/065B32B27/281B32B33/00B32B2266/0214B32B2307/204G01L1/142
Inventor 罗如柏吴雅婷周世生
Owner XIAN UNIV OF TECH
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