Preparation method of a 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: 2021-09-28
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 a high-sensitivity piezoresistive strain sensor
  • Preparation method of a high-sensitivity piezoresistive strain sensor
  • Preparation method of a high-sensitivity piezoresistive strain sensor

Examples

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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 then 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...

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Abstract

The invention relates to the technical field of strain sensors, in particular to a preparation method of a high-sensitivity piezoresistive strain sensor. The method comprises: adding distilled water to polyvinyl alcohol, first swelling and then stirring and heating until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol gel, which is cooled to room temperature for later use; adding glutaraldehyde solution dropwise to the polyvinyl alcohol gel In the gel, stir evenly and place it at room temperature to prepare polyvinyl alcohol / glutaraldehyde gel; add the prepared ferric chloride aqueous solution to the polyvinyl alcohol / glutaraldehyde gel dropwise, and transfer it to Freeze in a polytetrafluoroethylene mold, and then freeze-dry to prepare a ferric chloride / polyvinyl alcohol composite film; add pyrrole monomer to an aqueous solution of acetonitrile, stir to form a monomer solution, and ferric chloride / polyvinyl alcohol The polyvinyl alcohol composite film is immersed in the monomer solution, reacted at room temperature, and then washed with methanol to obtain a polypyrrole / polyvinyl alcohol composite film, which is 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 Patents(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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