A piezoresistive sensor with superelastic porous structure and its preparation method

A piezoresistive sensor and porous structure technology, which is applied in the measurement of the property force of piezoresistive materials, etc., can solve the problems of inability to measure piezoresistive sensors, achieve good accuracy and piezoresistive sensitivity, high sensitivity, and reduce small damage effect

Active Publication Date: 2021-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing flexible piezoresistive sensors use silicon wafer dies to prepare flexible micro-protrusions on the surface. Such micro-protrusion structures are only suitable for small deformations, and are not suitable for large deformations, especially for larger cracks. , the existing piezoresistive sensors are often unable to measure it well

Method used

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  • A piezoresistive sensor with superelastic porous structure and its preparation method
  • A piezoresistive sensor with superelastic porous structure and its preparation method
  • A piezoresistive sensor with superelastic porous structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of a piezoresistive sensor with a superelastic porous structure based on 3% acetylene black by mass.

[0028] Concrete preparation is carried out as follows:

[0029] 1. Mix the Eco-flex monomer and the curing agent according to the mass ratio of 1:1 to obtain the Eco-flex mixed solution, which is used to prepare the matrix material;

[0030] 2. Add acetylene black powder with a mass of 3% of the Eco-flex monomer used to the above mixed solution, and mix evenly to obtain a mixed solution;

[0031] 3. Add 6.67% CaCO in the above mixed solution 3 Powder and surfactant, fully mixed to obtain uncured conductive adhesive;

[0032] 4. Transfer the conductive adhesive to a clean glass template, and add CH with a volume concentration of 5% at a constant temperature of 20°C. 3 COOH, and stir to make it foam, then let it stand for a period of time, and then remove the excess CH 3 COOH poured out of the template;

[0033] 5. Heating the coated sample at...

Embodiment 2

[0035] Example 2: Preparation of a piezoresistive sensor with a superelastic porous structure based on 3.5% by mass of acetylene black.

[0036] Concrete preparation is carried out as follows:

[0037] 1. Mix the Eco-flex monomer and the curing agent according to the mass ratio of 1:1 to obtain the Eco-flex mixed solution, which is used to prepare the matrix material;

[0038]2. Add acetylene black powder with a mass of 3.5% of the Eco-flex monomer used to the above mixed solution, and mix evenly to obtain a mixed solution;

[0039] 3. Add 6.67% CaCO in the above mixed solution 3 Powder and surfactant, fully mixed to obtain uncured conductive adhesive;

[0040] 4. Transfer the conductive adhesive to a clean glass template, and add CH with a volume concentration of 5% at a constant temperature of 20°C. 3 COOH, and stirred to make the reaction foam. Then let it stand for a period of time to react, and then add excess CH 3 COOH poured out of the template;

[0041] 5. Heatin...

Embodiment 3

[0043] Example 3: Preparation of a piezoresistive sensor with a superelastic porous structure based on 5% acetylene black by mass.

[0044] Concrete preparation is carried out as follows:

[0045] 1. Mix the Eco-flex monomer and the curing agent according to the mass ratio of 1:1 to obtain the Eco-flex mixed solution, which is used to prepare the matrix material;

[0046] 2. Add acetylene black powder with a mass of 5% of the Eco-flex monomer used to the above mixed solution, and mix evenly to obtain a mixed solution;

[0047] 3. Add 6.67% CaCO in the above mixed solution 3 Powder and surfactant, fully mixed to obtain uncured conductive adhesive;

[0048] 4. Transfer the conductive adhesive to a clean glass template, and add CH with a volume concentration of 5% at a constant temperature of 20°C. 3 COOH, and stirred to make the reaction foam. Then let it stand for a period of time to react, and then add excess CH 3 COOH poured out of the template;

[0049] 5. Heating the ...

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Abstract

The invention discloses a piezoresistive sensor with a hyperelastic porous structure and a preparation method thereof. According to the piezoresistive sensor, a composite material formed by a hyperelastic matrix and a conductive phase is regarded as the basic material, and foaming of the basic material with mixing of foaming reaction powder and CH3COOH is performed to obtain a pressure-sensitive layer, wherein the thickness of the pressure-sensitive layer, the porosity and the aperture dimension can be randomly regulated and controlled according to different usage conditions. According to thepiezoresistive sensor with the hyperelastic porous structure, functions of an ordinary piezoresistive sensor can be realized, the sensitivity is very high, the measuring range is hardly restricted, and the sensor can be applicable to detection of a large slit or distance; through the hyperelastic characteristic, the damage to a detected object can be reduced to the maximum, high-precision measurement in a low pressure can be realized, and the sensor is especially applicable to nondestructive detection of cultural relic cracks; and the method is simple and easy to implement, the cost is low, the performance is excellent, and the application prospect is good.

Description

technical field [0001] The invention belongs to the field of flexible and stretchable piezoresistive sensors, in particular to a piezoresistive sensor with a superelastic porous structure and a preparation method thereof. The piezoresistive sensor uses a conductive layer of a superelastic porous structure as a pressure sensitive layer, and can be used in Non-destructive testing of gaps, especially the detection of cracks in cultural relics. Background technique [0002] Traditional crack measurement methods include: feeler gauge, electronic ruler, crack width tester, laser gap gun, Bragg fiber optic sensor, etc., but there are certain problems, such as the feeler gauge cannot meet the real-time measurement requirements, the measurement error is large and it is easy to cause Secondary damage. However, the crack width tester has larger equipment volume and higher cost. The Bragg fiber optic sensor needs to be punched for embedded measurement, which will cause great damage to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 王宗荣李皓盛王珊陈国瑞简阅王子琦周麟铭许露杭苗雨欣牛韶玉陈凯峰孟成达郑小奕杜丕一
Owner ZHEJIANG UNIV
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