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Flexible strain sensor with crack structure and preparation method thereof

A strain sensor, flexible technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measuring device, etc., can solve the problems of poor sensitivity of flexible strain sensor, restrict the development of flexible strain sensor, high production cost, etc., achieve low production cost and easy processing , the effect of high sensitivity

Active Publication Date: 2016-07-20
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, compared with traditional strain sensors, flexible strain sensors have disadvantages such as poor sensitivity, poor signal-to-noise ratio, poor stability, and high production costs; these disadvantages restrict the development of flexible strain sensors.

Method used

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  • Flexible strain sensor with crack structure and preparation method thereof
  • Flexible strain sensor with crack structure and preparation method thereof
  • Flexible strain sensor with crack structure and preparation method thereof

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Embodiment

[0045] In this embodiment, thermoplastic polyurethane (TPU) is used as a flexible substrate, graphene is used as a conductive layer, and polydimethylsiloxane (PDMS) is used as a protective layer to prepare a flexible strain sensor with a crack structure. The specific process is as follows:

[0046] a. Preheat 3 g of TPU pellets at 205°C for 10 minutes, then hot-press for 5 minutes under a pressure of 2 MPa, and finally cool to room temperature under a pressure of 2 MPa to prepare a TPU film; wherein, the density of the TPU pellets used is 1.12 g / cm 3 , the melt index is 17.5g / 10min (215°C, 10kg), and the thickness of the prepared TPU film is 0.15mm;

[0047] b. Roll-coat 2.5 mL of graphene conductive paste on the TPU film pressed and formed in step a, and place the composite material coated with conductive paste in an oven for 20 minutes at an oven temperature of 70 ° C. , to form a conductive layer on its surface; the graphene conductive paste is purchased commercially, and...

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Abstract

The invention belongs to the technical field of sensor manufacturing and especially relates to a flexible strain sensor with a crack structure and a preparation method thereof. The invention provides a flexible strain sensor comprising a flexible substrate, a conducting coating which is coated on the flexible substrate and provided with a prefabricated crack structure, a pair of electrodes which are positioned at two ends of the conducting coating surface, and a protection layer which covers the conducting coating surface and is made from flexible polymer. By means of the flexible strain sensor provided by the invention, small strain changes can be accurately monitored; the preparation method is simple and low in cost; the flexible strain sensor has high sensitivity, good stability and long service life, and can be bended and twisted.

Description

technical field [0001] The invention belongs to the technical field of sensor manufacturing, and in particular relates to a flexible strain sensor with a crack structure and a preparation method thereof. Background technique [0002] Strain sensors are widely used in optoelectronics, machinery, petroleum, metallurgy, biology, medical treatment, transportation and national defense. Traditional strain sensors are made of inorganic materials such as silicon or zinc oxide. Large deformation will cause irreversible damage to the sensor; therefore, it is imperative to develop new strain sensors, among which polymer-based flexible strain sensors have become a hot spot of attention and research. The flexible strain sensor is a type of sensor based on measuring the force deformation of an object accompanied by a change in resistance. It uses flexible materials (generally polymer materials) instead of rigid substrates. Compared with traditional strain sensors, it has a larger measurab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 代坤李泽宇李国杰郑国强刘春太申长雨
Owner ZHENGZHOU UNIV
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