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High-sensitivity stretchable flexible strain sensor and preparation method thereof

A strain sensor, flexible technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of low stretchability, low sensitivity, poor stability, etc., achieve simple preparation method, improve Sensing performance, cost reduction effects

Active Publication Date: 2018-02-02
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and provide a flexible strain sensor and its preparation method, which solves the problem of low sensitivity and stretchability of the sensor when it is stretched. The problem of not high and long-term use stability is not good, which greatly improves the sensing performance

Method used

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  • High-sensitivity stretchable flexible strain sensor and preparation method thereof
  • High-sensitivity stretchable flexible strain sensor and preparation method thereof
  • High-sensitivity stretchable flexible strain sensor and preparation method thereof

Examples

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Embodiment 1

[0072] This embodiment provides a flexible strain sensor and a preparation method thereof, the method comprising the following steps:

[0073] (1)'Urethane sponge (thickness 0.8mm, length 20mm, width 10mm) is repeatedly washed with deionized water and absolute ethanol, and then dried;

[0074] (1) Soak the dried polyurethane sponge in a graphene solution for 4 hours, and then use hot hydroiodic acid to reduce the polyurethane sponge soaked with graphene oxide at 85°C for 12 minutes in a water bath. The concentration of the solution is calibrated as follows: make the volume ratio of hydriodic acid to deionized water in the solution of graphene oxide be 1:1, dry, then repeat the above-mentioned steps of soaking, reducing and drying for 4 times successively, and repeat the last time After time-reduction, it is washed with deionized water and then dried to obtain a graphene-coated polyurethane sponge;

[0075] (2) the graphene-coated polyurethane sponge described in step (1) is u...

Embodiment 2

[0081] (1)'Urethane sponge (thickness 1mm, length 25mm, width 10mm) is repeatedly washed with deionized water and absolute ethanol, and then dried;

[0082] (1) Soak the dried polyurethane sponge in a graphene solution for 3 hours, and then use hot hydroiodic acid to reduce the polyurethane sponge soaked with graphene oxide at 90°C for 10 minutes in a water bath. The concentration of the deionized water is calibrated as follows: make the volume ratio of hydriodic acid to deionized water in the solution of graphene oxide be 1:2, dry, then repeat the above-mentioned steps of soaking, reducing and drying for 3 times successively, and repeat the last time After time-reduction, it is washed with deionized water and then dried to obtain a graphene-coated polyurethane sponge;

[0083] (2) the graphene-coated polyurethane sponge described in step (1) is used as the cathode, the nickel foil is the anode, and the NiCl 2 ·6H 2 O, H 3 BO 3 and a mixed solution of ethylenediamine dihyd...

Embodiment 3

[0087] (1) 'Polyurethane sponge (thickness 1.5mm, length 30mm, width 15mm) is repeatedly washed with deionized water and absolute ethanol, and then dried;

[0088] (1) Soak the dried polyurethane sponge in a graphene solution for 5 hours, and then use hot hydroiodic acid to reduce the polyurethane sponge soaked with graphene oxide at 85°C for 10 minutes in a water bath. The concentration of the solution is calibrated as follows: make the volume ratio of hydriodic acid to deionized water in the solution of graphene oxide be 1:5, dry, then repeat the above-mentioned steps of soaking, reducing and drying twice successively, and repeat the last time After time-reduction, it is washed with deionized water and then dried to obtain a graphene-coated polyurethane sponge;

[0089] (2) the graphene-coated polyurethane sponge described in step (1) is used as the cathode, the nickel foil is the anode, and the NiCl 2 ·6H 2 O, H 3 BO 3 and a mixed solution of ethylenediamine dihydrochlo...

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Abstract

The invention provides a high-sensitivity stretchable flexible strain sensor and a preparation method thereof. The flexible strain sensor includes a composite material which is formed by coating polyurethane foam with graphene and a nickel film with cracks in sequence from inside to outside, and a packaging layer which packages the composite material. As the graphene and the nickel film with cracks are arranged on the polyurethane foam, the sensitivity of the sensor can be greatly improved when the sensor is stretched. The PDMS package further improves the bending and tensile properties of theflexible strain sensor. The problem that a sensor has low sensitivity, low stretchability and poor long-time use stability under strain tension is solved, and the sensing performance is greatly improved. The method of the invention is simple, and low in cost. The problem that the flexible strain sensor process is complex and costs high and the flexible strain sensor prepared has low conductivityand poor reusability is solved.

Description

technical field [0001] The invention relates to the field of composite materials, and relates to a flexible strain sensor and a preparation method thereof, in particular to a high-sensitivity stretchable flexible strain sensor and a preparation method thereof. Background technique [0002] With the development of flexible wearable devices and robotics industry, smart wearable flexible devices have been widely used in people's lives and human-computer interaction interfaces, and have gradually become an important direction and technology for the development of smart technology in the future. For flexible wearable devices, maintaining relatively stable sensitivity under different strains is an important part of realizing their normal operation. Therefore, it is important to develop flexible strain sensors with high conductivity and high reliability under different strains. [0003] In the current research on flexible strain sensors, graphene, carbon nanotubes, metal nanowires...

Claims

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Application Information

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IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 张国平韩飞李金辉张愿孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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