Piezoresistive sensor material and preparation method and application thereof

A sensor device and piezoresistive technology, applied in the field of piezoresistive sensor device materials and their preparation, can solve problems such as poor force sensitivity and low electrical conductivity, and achieve improved mechanical strength, pore wall integrity, and good cyclic compression performance. Effect

Active Publication Date: 2020-02-11
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyelectrolyte hydrogels are excellent ion-conducting three-dimensional networks, but suffer from low conductivity and poor force sensitivity

Method used

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  • Piezoresistive sensor material and preparation method and application thereof
  • Piezoresistive sensor material and preparation method and application thereof
  • Piezoresistive sensor material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of piezoresistive sensor material, comprising the following steps:

[0047] S1: Use ionic liquid to treat poplar wood powder with a particle size of 60 mesh, then solify it, chemically cross-link-gelize it, and freeze-dry to obtain lignocellulosic aerogel. The specific operations include: S11: Add 1-ethyl -Add 4% wood powder in mass fraction to 3-methyl-imidazole acetate ionic liquid, then heat and stir at 110°C for 24h to form a suspension, then transfer the suspension to 8 times its volume , the concentration is 40% v / v acetone aqueous solution, stir 1h, suction filter and wash to obtain filter residue, filter residue is dried at 100 ℃ to obtain wood fiber; S12: add the wood fiber to 4wt% NaOH and 4wt% urea In the aqueous solution, the mass ratio of the wood fiber to the aqueous solution is 0.8:100. After the suspension is formed, it is frozen at -40°C for 9 hours, then thawed at room temperature, and the above freeze-thaw treatment is repeated 3 ...

Embodiment 2

[0053] A preparation method of piezoresistive sensor material, comprising the following steps:

[0054] S1: Use ionic liquid to treat balsa wood powder with a particle size of 100 meshes, then solify it, chemically cross-link-gelize it, and freeze-dry to obtain lignocellulosic airgel. The specific operations include: S11: Add 1-ethyl - Add 6% wood flour by mass fraction to 3-methyl-imidazole acetate ionic liquid, then heat and stir at 185°C for 30min to form a suspension, then transfer the suspension to 10 times its volume , the concentration is 60% v / v acetone aqueous solution, stir 3h, suction filter and wash to obtain filter residue, filter residue is dried at 110 ℃ to obtain wood fiber; S12: add described wood fiber to 4wt% NaOH and 4wt% urea In the aqueous solution, the mass ratio of the wood fiber to the aqueous solution is 1.5:100 to form a suspension, which is then frozen at -20°C for 9 hours and then thawed at room temperature, and the above-mentioned freeze-thaw trea...

Embodiment 3

[0060] A preparation method of piezoresistive sensor material, comprising the following steps:

[0061] S1: Use ionic liquid to treat poplar wood powder with a particle size of 80 mesh, then solify it, chemically cross-link-gelize it, and freeze-dry to obtain lignocellulosic airgel. The specific operations include: S11: Add 1-ethyl -Add 5% wood powder by mass fraction to 3-methyl-imidazole acetate ionic liquid, then heat and stir at 147.5°C for 9h to form a suspension, then transfer the above suspension to 9 times its volume , the concentration is 50% v / v acetone aqueous solution, stir 2h, suction filter and wash to obtain filter residue, filter residue is dried at 105 ℃ to obtain wood fiber; In the aqueous solution, the mass ratio of the wood fiber to the aqueous solution is 1.0:100 to form a suspension, which is then frozen at -30°C for 9 hours and then thawed at room temperature, and the above-mentioned freeze-thaw treatment is repeated 4 times to obtain solified wood fiber...

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Abstract

The invention provides a preparation method of a piezoresistive sensor material. The preparation method comprises the following steps: preparing a wood fiber aerogel; then, subjecting dopamine to self-polymerization on the surface of the wood fiber aerogel so as to obtain a wood fiber-based hydrogel; immersing the wood fiber-based hydrogel into a nanometer conductive phase suspension or a nanometer conductive phase precursor solution to form a conductive phase wood fiber-based hydrogel; reacting the conductive phase wood fiber-based hydrogel with an aqueous solution containing a polyelectrolyte monomer, a cross-linking agent, an initiator and a catalyst to form a composite conductive phase wood fiber-based hydrogel; and complexing the composite conductive phase wood fiber-based hydrogel with metal ions. The invention further discloses a piezoresistive sensor containing the sensor material and a preparation method of the piezoresistive sensor. The sensor material prepared by the methodprovided by the invention has excellent mechanical strength and ionic conductivity, and the prepared sensor has very high sensitivity.

Description

technical field [0001] The invention belongs to the field of sensor material preparation, and in particular relates to a piezoresistive sensor material and its preparation method and application. Background technique [0002] Flexible piezoresistive sensors have the ability to assist in identifying environmental features or stimuli, so they can be used as important components in the field of human-computer interaction such as wearable smart devices, artificial muscles, electronic skin, and medical diagnosis. The fundamental mechanism of the piezoresistive effect lies in the phenomenon that the conductive network or energy band structure of the material changes under the action of external stress, thereby causing the resistivity to change. Among them, the three-dimensional conductive network system is a common piezoresistive material. By filling the conductive phase in the flexible polymer elastomer, a continuous conductive network is formed. When deformation occurs, the cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/26G01L1/18C08L97/02C08L33/02
CPCC08J9/40C08J9/405C08J9/26G01L1/18C08J2397/02C08J2433/02C08K2201/011C08K2003/0806C08K3/042C08K2201/001B27N3/04B27N5/00B01J13/0052B01J13/0065B01J13/0091B27K3/0207B27K3/15B27K3/16B27K2200/10B27K2240/00B27N3/02B27N3/18
Inventor 沈晓萍孙庆丰聂康晨郑理
Owner ZHEJIANG FORESTRY UNIVERSITY
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