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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 wide popularization and application of materials, low high stretchability, low sensitivity, etc., and achieve large strain sensing range, low production cost, and simple and convenient operation Effect

Active Publication Date: 2020-05-01
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 application of materials in the market.
In other words, the preparation of strain sensors with good stretchability (strain > 50%) and high response sensitivity (sensitivity factor GF > 100) is still a major challenge in this field.

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

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Comparison scheme
Effect test

Embodiment 1

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

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

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

Embodiment 2

[0059] The first three steps of the preparation method are the same as in Example 1. When the crack-wrinkle microstructure is constructed in the fourth step, a 50% strain is applied at a rate of 2mm / min, and then 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, and the strain sensor with microstructure is obtained.

Embodiment 3

[0061] The first three steps of the preparation method are the same as in Example 1. When the crack-wrinkle microstructure is constructed in the fourth step, a strain of 70% is applied at a rate of 2 mm / min, and then 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, and the strain sensor with microstructure is obtained.

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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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Patent Type & Authority Patents(China)
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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