Preparation method of high-sensitivity piezoresistive strain sensor

A strain sensor and high-sensitivity technology, applied in the field of strain sensors, can solve the problem of lack of small strain sensors

Active Publication Date: 2020-12-22
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current sensors for small strains are still missing

Method used

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  • Preparation method of high-sensitivity piezoresistive strain sensor
  • Preparation method of high-sensitivity piezoresistive strain sensor
  • Preparation method of high-sensitivity piezoresistive strain sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of a high-sensitivity piezoresistive strain sensor, comprising the steps of:

[0030] (1) Add 10g of distilled water to 1.0g of polyvinyl alcohol powder, first swell at 55°C for 65min, then stir and heat at 80°C for 3h until the polymer is completely dissolved to obtain polyvinyl alcohol gel, cool to room temperature for later use.

[0031] (2) 1 mL of glutaraldehyde solution with a concentration of 1.0 wt.% was added dropwise to 10 g of polyvinyl alcohol gel, stirred evenly, and left at room temperature for 10 h to prepare polyvinyl alcohol / glutaraldehyde gel.

[0032] (3) Prepare 1 mL of ferric chloride aqueous solution with a concentration of 2.0 g / mL, stir and drop the ferric chloride solution into 10 g of polyvinyl alcohol / glutaraldehyde gel (ferric chloride and polyvinyl alcohol / pentane The mass ratio of dialdehyde gel is 1:5), and immediately transferred to the bottom area after stirring evenly, the area is 10*10cm 2 Freeze at -5°C for 10 ho...

Embodiment 2

[0035] A preparation method of a high-sensitivity piezoresistive strain sensor, comprising the steps of:

[0036] (1) Add 10 g of distilled water to 2.0 g of polyvinyl alcohol powder, first swell at 65°C for 70 minutes, then stir and heat at 95°C for 3 hours until the polymer is completely dissolved to obtain a polyvinyl alcohol gel, and cool to room temperature for later use.

[0037] (2) 1 mL of glutaraldehyde solution with a concentration of 5.0 wt.% was added dropwise to 10 g of polyvinyl alcohol gel, stirred evenly, and left at room temperature for 10 h to prepare polyvinyl alcohol / glutaraldehyde gel.

[0038] (3) Prepare 1 mL of ferric chloride aqueous solution with a concentration of 5.0 g / mL, stir and drop the ferric chloride solution into 10 g of polyvinyl alcohol / glutaraldehyde gel (ferric chloride and polyvinyl alcohol / pentane The mass ratio of dialdehyde gel is 1:2), and immediately transferred to the bottom area after stirring evenly, the area is 10*10cm 2 Freeze...

Embodiment 3

[0041] A preparation method of a high-sensitivity piezoresistive strain sensor, comprising the steps of:

[0042] (1) Add 8g of distilled water to 1.2g of polyvinyl alcohol powder, first swell at 60°C for 60min, then stir and heat at 90°C for 3h until the polymer is completely dissolved to obtain polyvinyl alcohol gel, cool to room temperature for later use.

[0043] (2) 1 mL of glutaraldehyde solution with a concentration of 1.0 wt.% was added dropwise to 10 g of polyvinyl alcohol gel, stirred evenly, and left at room temperature for 10 h to prepare polyvinyl alcohol / glutaraldehyde gel.

[0044](3) Prepare 1 mL of ferric chloride aqueous solution with a concentration of 5.0 g / mL, stir and drop the ferric chloride solution into 10 g of polyvinyl alcohol / glutaraldehyde gel (ferric chloride and polyvinyl alcohol / pentane The mass ratio of dialdehyde gel is 1:2), and immediately transferred to the bottom area after stirring evenly, the area is 10*10cm 2 Freeze at -5°C for 10 h in...

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Abstract

The invention relates to the technical field of strain sensors, and in particular, relates to a preparation method of a high-sensitivity piezoresistive strain sensor. The method comprises the steps: adding distilled water into polyvinyl alcohol, firstly swelling, then stirring and heating until the polyvinyl alcohol is completely dissolved to prepare polyvinyl alcohol gel, and cooling to room temperature for later use; dropwise adding a glutaraldehyde solution into the polyvinyl alcohol gel, uniformly stirring, and standing at room temperature to obtain polyvinyl alcohol/glutaraldehyde gel; dropwise adding a prepared ferric trichloride aqueous solution into the polyvinyl alcohol/glutaraldehyde gel, uniformly stirring, immediately transferring into a polytetrafluoroethylene mold, freezing,and freeze-drying to obtain a ferric trichloride/polyvinyl alcohol composite membrane; and adding a pyrrole monomer into an aqueous solution of acetonitrile, uniformly stirring to form a monomer solution, soaking the ferric trichloride/polyvinyl alcohol composite membrane into the monomer solution, reacting at room temperature, and washing with methanol to obtain a polypyrrole/polyvinyl alcohol composite membrane, namely the high-sensitivity piezoresistive strain sensor.

Description

technical field [0001] The invention relates to the technical field of strain sensors, in particular to a preparation method of a high-sensitivity piezoresistive strain sensor. Background technique [0002] In recent years, the rapid development of flexible and wearable electronic devices has stimulated people's research interest in sensors, and developing a flexible and highly sensitive strain sensor has become an important research direction. The strain sensor based on the piezoresistive effect has attracted much attention because it can directly respond to the strain through the change of resistance and has high sensitivity. [0003] A piezoresistive strain sensor is mainly composed of a conductive component and an elastic substrate. Sensors formed by combining conductive materials such as carbon black, silver nanowires, graphene, and conductive polymers with materials such as carbon paper and polyurethane yarns (CS Appl. Mater. Interfaces 2020, 12, 1, 1558–1566; ACS Nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 石婉辉韩高义常云珍侯文静
Owner SHANXI UNIV
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