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Preparation method of flexible strain sensor with adjustable sensing performance

A strain sensor and performance technology, applied in the field of flexible strain sensor preparation, can solve the problems of single sensor structure, practical application limitations of the sensor, and difficulty in adjusting the sensing performance of the sensor, so as to achieve a wide strain monitoring range, and adjustable sensitivity and linearity. Effect

Active Publication Date: 2020-06-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the sensor prepared by the above two methods is single, and the sensing performance of the sensor is difficult to adjust, which severely limits the practical application of the sensor.

Method used

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  • Preparation method of flexible strain sensor with adjustable sensing performance
  • Preparation method of flexible strain sensor with adjustable sensing performance
  • Preparation method of flexible strain sensor with adjustable sensing performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 500 mg of carbon nanotubes into 1000 mL of deionized water, and ultrasonically disperse for 10 minutes at 100 W using a sonicator. Then pour the solution into a centrifuge, centrifuge at a rate of 6000 r / min for 30 minutes, repeat ultrasonic dispersion and centrifugal dispersion three times to obtain a carbon nanotube dispersion. Suction filter the carbon nanotube dispersion to prepare a carbon nanotube film with a thickness of 30 μm, according to 3×10mm 2 Cut the prepared carbon nanotube film to size and place it in a mold, mix liquid polydimethylsiloxane and curing agent into the mold with a mass ratio of 10:1, and let it stand at room temperature for 30 minutes, and then placed in an oven at 70°C for 2 hours to cure and then peeled off to prepare a single-sided conductive flexible substrate. Apply a 10% pre-strain to the flexible substrate using a jig and use it as the cathode of the electrolytic cell with the copper plate as the anode at a current density of 3A...

Embodiment 2

[0020] The difference from Example 1 is that a clamp is used to apply a 20% pre-strain to the flexible substrate to electrodeposit the copper film. The prepared copper / flexible substrate composite film is observed with a laser scanning confocal microscope, and it can be seen that the electrodeposited copper film has a laminated structure. After testing, the sensitivity of the prepared flexible strain sensor is 36-122, and the strain monitoring range is 0-74%. image 3 (b) shown.

Embodiment 3

[0022] The difference from Example 1 is that a clamp is used to apply a 30% pre-strain to the flexible substrate to electrodeposit the copper film. The prepared copper / flexible substrate composite film was observed with a laser scanning confocal microscope, and it can be seen that the electrodeposited copper film has a coiled structure. After testing, the sensitivity of the prepared flexible strain sensor is 24, the strain monitoring range is 0-84%, and it is linear in the whole strain monitoring range, and the linearity is as high as 99.3%. image 3 (c) shown.

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Abstract

The invention discloses a preparation method of a strain sensor with adjustable sensing performance, which comprises the following steps: carrying out suction filtration on a carbon nanotube dispersion liquid to obtain a carbon nanotube film, and carrying out curing compounding on the carbon nanotube film and an elastomer to obtain a single-sided conductive flexible substrate; performing electro-deposition of a copper film on the flexible substrate in a pre-stretched state, and returning to a free state to prepare a microstructure-adjustable copper / flexible substrate composite film; connectingtwo copper wires to the two ends of the composite film respectively, and then packaging the composite film by the elastomer, so that the flexible strain sensor with adjustable sensing performance isprepared. The sensor prepared by the invention is composed of a single-sided conductive flexible substrate and an electrodeposited copper film, can realize the characteristics of adjustable sensitivity and linearity and wide strain monitoring range, and can be applied to the fields of flexible wearing, structural health monitoring, gravity testing technology and the like.

Description

technical field [0001] The invention belongs to the technical field of composite material flexible sensor preparation, and relates to a preparation method of a flexible strain sensor with adjustable sensitivity and linearity and a wide strain monitoring range. Background technique [0002] With the development and progress of society, miniaturized and intelligent strain sensors can be seen everywhere in our lives. Compared with traditional strain sensors based on metal and semiconductor materials, flexible strain sensors overcome their brittleness, are flexible and stretchable, and have great potential in the fields of human health monitoring, structural health monitoring, and gravity testing. . Flexible sensors are mainly composed of flexible polymer substrates and conductive sensing materials. Among them, the polymers that can be used to prepare flexible substrates include materials such as polyester, polyimide, polyethylene terephthalate, polyurethane, polydimethylsilox...

Claims

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Application Information

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IPC IPC(8): G01B7/16B82Y40/00B82Y15/00
CPCB82Y15/00B82Y40/00G01B7/16
Inventor 张滨白瑶瑶王哲轩
Owner NORTHEASTERN UNIV
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