Strain sensor with high sensitivity and large strain response and preparation method thereof

A strain sensor and sensor technology, applied in the field of strain sensors, can solve the problems of restricting the widespread promotion and application of materials, high stretchability, low sensitivity, etc., and achieve a large strain sensing range, low production cost, and simple and convenient operation. Effect

Active Publication Date: 2018-05-18
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the contradiction between high stretchability/low sensitivity and low stretchability/high sensitivity commonly exists in the reported stretchable strain sensors, which greatly limits the wide promotion and applica

Method used

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  • Strain sensor with high sensitivity and large strain response and preparation method thereof
  • Strain sensor with high sensitivity and large strain response and preparation method thereof
  • Strain sensor with high sensitivity and large strain response and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0052] Example one:

[0053] In this embodiment, polyurethane fiber is used as the matrix, carbon nanotube ink is used as the conductive coating, the fiber is swelled in DMF, and then the conductive ink is uniformly distributed on the surface of the fiber during the ultrasonic process to make a strain sensor. Finally, the strain sensor is manufactured in the electronic universal testing machine. The strain sensor with crack-fold microstructure is prepared by applying stress; the specific process is:

[0054] (1) Cut the polyurethane fiber into a length of 4cm, and wash it with absolute ethanol and deionized water in an ultrasonic cleaner for 10 minutes to remove surface impurities; the size of the polyurethane fiber used is 2500D and the diameter is 500μm;

[0055] (2) Put the polyurethane fibers cleaned in step (1) into the DMF solution, swell for 1 hour, and then put the swollen polyurethane fibers into the carbon nanotube ink dispersion in turn, and the carbon nanotube ink complet...

Example Embodiment

[0058] Example two

[0059] The first three steps of the preparation method are the same as in Example 1. When constructing the crack-fold microstructure in the fourth step, apply 50% strain at a rate of 2mm / min, and then return to the initial position at the same rate; The two ends of the polyurethane fiber covered with carbon nanotube coating are connected with copper tape as electrodes to obtain a strain sensor with microstructure.

Example Embodiment

[0060] Example three

[0061] The first three steps of the preparation method are the same as in Example 1. When constructing the crack-fold microstructure in the fourth step, a strain of 70% is applied at a rate of 2mm / min, and then it returns to the original position at the same rate; The two ends of the polyurethane fiber covered with carbon nanotube coating are connected with copper tape as electrodes to obtain a strain sensor with microstructure.

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Abstract

The invention belongs to the field of strain sensors, in particular relates to a strain sensor with high sensitivity and a large strain response and a preparation method thereof. The invention provides a flexible strain sensor, the sensor comprises a flexible substrate, a conductive coating with which the surface of the flexible substrate is covered, a conductive wire fixing unit and a pair of electrodes, wherein the flexible substrate is fiber, the conductive coating surface has a uniformly distributed fracture-fold microstructure. According to the sensor, by building the microstructure in the conductive coating, it can meet the requirement of high sensitivity of the sensor under a large tensile strain in the use process.

Description

technical field [0001] The invention belongs to the field of strain sensors, in particular to a strain sensor with large strain response and ultrahigh sensitivity and a preparation method thereof. Background technique [0002] Traditional strain sensors based on metal foils, metal oxides or semiconductors, due to poor toughness, the strain response range of the materials during use is very limited (strain<5%); irreversible damage occurs, which greatly limits its application in wearable devices. [0003] In recent years, flexible strain sensors based on wide strain response range, good response repeatability and fast strain response rate have attracted extensive attention from researchers in the fields of human health monitoring, electronic skin, and wearable flexible electronic motion detection. . However, the contradiction between high stretchability / low sensitivity and low stretchability / high sensitivity generally exists in the reported stretchable strain sensors, whi...

Claims

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Application Information

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IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 代坤孙红玲魏向东李建伟郑国强刘春太
Owner ZHENGZHOU UNIV
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