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Layered structure strain sensor based on graphene composite thin film material and its fabrication

A strain sensor, graphene composite technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of limiting industrial application potential, difficult to meet application requirements, complex preparation process, etc., to improve strain sensitivity, The effect of high transparency and simple process

Inactive Publication Date: 2017-11-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphene-based strain sensor prepared by this method has high sensitivity, but the CVD method has limited its industrial application potential due to defects such as complex preparation process, high cost, and long production cycle.
In addition, in the actual application process, the contact interface between the graphene-based strain sensor and the object to be detected is easy to separate, which is difficult to meet the actual application requirements.

Method used

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  • Layered structure strain sensor based on graphene composite thin film material and its fabrication
  • Layered structure strain sensor based on graphene composite thin film material and its fabrication
  • Layered structure strain sensor based on graphene composite thin film material and its fabrication

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Experimental program
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Effect test

Embodiment 1

[0031] use as figure 1 The shown model prepares a layered structure strain sensor based on graphene composite thin film material.

[0032] The manufacture method of the layered structure strain sensor based on graphene composite film material, comprises the following steps:

[0033] (1) Take 1mL of styrene-acrylic emulsion (solid content 50%, viscosity 500-2000mPa·s, pH 6.5-8.5), dilute it with 1mL deionized water, and spray it on the rubber sheet substrate with a spray gun to facilitate For the test of strain sensing performance, the size of the rubber sheet is 90mm*15mm, and the amount of emulsion spraying is about 370g / m 2 , forming an emulsion coating.

[0034] (2) Weigh 500mg of graphene (prepared by liquid phase exfoliation method, lateral size 150-550nm, layer number 1-10 layers) into 1000mL deionized water, add 5mg of surfactant sodium lauryl sulfate, magnetically stir After 30 min, ultrasonic treatment was performed for 2 h to obtain a graphene dispersion with a go...

Embodiment 2

[0037] The manufacture method of the layered structure strain sensor based on graphene composite film material, comprises the following steps:

[0038](1) Take 1mL of styrene-acrylic emulsion (solid content 50%, viscosity 500-2000mPa·s, pH 6.5-8.5), dilute it with 1mL deionized water, and spray it on the rubber sheet substrate with a spray gun to facilitate For the test of strain sensing performance, the size of the rubber sheet is 90mm*15mm, and the amount of emulsion spraying is about 370g / m 2 , forming an emulsion coating.

[0039] (2) Weigh 500 mg of graphene (prepared by liquid phase exfoliation method, lateral size 150-550 nm, layer number 1-10 layers) and add it to 1000 mL deionized water, add 5 mg of surfactant ammonium cholate, and stir magnetically for 30 min. After ultrasonic treatment for 2 hours, a graphene dispersion with good dispersibility and a concentration of 0.5 mg / mL was obtained. Get 3.5mL above-mentioned graphene dispersion liquid, use spray gun to con...

Embodiment 3

[0042] The manufacture method of the layered structure strain sensor based on graphene composite film material, comprises the following steps:

[0043] (1) Take 1mL of styrene-acrylic emulsion (solid content 57%, viscosity 300-750mPa·s, pH 7-8.5), dilute it with 1mL deionized water, and spray it on the rubber sheet substrate with a spray gun to facilitate The test of strain sensing performance, the size of the rubber sheet is 90mm*15mm, and the amount of emulsion spraying is about 422g / m 2 .

[0044] (2) Weigh 500mg of graphene (prepared by liquid phase exfoliation method, lateral size 150-550nm, layer number 1-10 layers) and add it to 1000mL deionized water, add 5mg of surfactant sodium dodecylbenzenesulfonate, After magnetic stirring for 30 min, ultrasonic treatment was performed for 2 h to obtain a graphene dispersion with good dispersibility and a concentration of 0.5 mg / mL. Get 3mL above-mentioned graphene dispersion liquid, use spray gun to continue to spray graphene d...

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Abstract

The invention relates to a layered structure strain sensor based on a graphene composite film material and its manufacture, comprising the following steps: (1) spraying a polymer emulsion on an object to be detected to prepare an emulsion coating; (2) preparing graphene Dispersion liquid, continue spraying graphene dispersion liquid on polymer emulsion coating, prepare and form graphene film, emulsion coating and graphene film form layered composite film; (3) at both ends of layered composite film, insert Wires are connected to electrical test equipment to obtain a layered structure strain sensor based on graphene composite thin film material integrated with the object to be detected. Compared with the prior art, the present invention can better solve the problem of interface contact with the object to be detected. This method can regulate the sensitivity of the graphene strain sensor by controlling the spraying amount of the graphene dispersion liquid, and a series of strain sensor devices with different strain sensitivities can be prepared on a large scale to meet different application requirements.

Description

technical field [0001] The invention belongs to the field of graphene nanomaterials, in particular to a layered structure strain sensor based on a graphene composite film material and its manufacture. Background technique [0002] The strain sensor is a functional device based on measuring the strain generated by the force deformation of the object, and has a wide range of applications in damage detection and structural monitoring. Traditional strain sensors are mainly prepared by using the geometric deformation and piezoresistive effect of metal materials or semiconductor materials. However, the technological level of traditional strain sensors has failed to achieve major breakthroughs in the past few decades. Due to the defects of the traditional strain sensor itself (poor toughness, etc.) and its application in the monitoring of large strain and complex structures, it is increasingly unable to meet people's needs. Therefore, the development of strain sensors with high s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
Inventor 张东刘泳
Owner TONGJI UNIV