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

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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 sol

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

Experimental program
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Example Embodiment

[0071] Example 1

[0072] This embodiment provides a flexible strain sensor and a preparation method thereof. The method includes the following steps:

[0073] (1)' The polyurethane 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 impregnated with graphene oxide at 85°C in a water bath for 12 minutes, hydroiodic acid The concentration is calibrated as follows: make the volume ratio of deionized water in the solution of hydroiodic acid and graphene oxide 1:1, dry, and then repeat the above-mentioned soaking, reduction and drying steps 4 times, and repeat the last time After time reduction, it is washed with deionized water and then dried to obtain graphene-coated polyurethane sponge;

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

Example Embodiment

[0080] Example 2

[0081] (1)' The polyurethane 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 impregnated with graphene oxide at 90°C in a water bath for 10 minutes, hydroiodic acid The concentration is calibrated as follows: make the volume ratio of deionized water in the solution of hydroiodic acid and graphene oxide 1:2, dry, and then repeat the above-mentioned soaking, reduction and drying steps 3 times, and repeat the last time After time reduction, it is washed with deionized water and then dried to obtain graphene-coated polyurethane sponge;

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

Example Embodiment

[0086] Example 3

[0087] (1)' The 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 impregnated with graphene oxide at 85°C in a water bath for 10 minutes. The concentration is calibrated as follows: make the volume ratio of deionized water in the solution of hydroiodic acid and graphene oxide 1:5, dry, and then repeat the above-mentioned soaking, reduction and drying steps twice, and repeat the last time After time reduction, it is washed with deionized water and then dried to obtain graphene-coated polyurethane sponge;

[0089] (2) Use the graphene-coated polyurethane sponge described in step (1) as the cathode, nickel foil as the anode, and NiCl 2 ·6H 2 O, H 3 BO 3 And ethylenediamine dihydrochloride mixed solution (NiCl 2 ·6H 2 O concentr...

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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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