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Graphene-based strain sensing film and preparation method and application thereof

A strain sensing, graphene-based technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve the problem that the level of strain sensor technology has not achieved major breakthroughs, graphene nanosheets are not tightly packed, graphene nanometers It can improve the reusability, high transparency and compact stacking effect.

Active Publication Date: 2017-05-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technological level of traditional strain sensors has failed to achieve major breakthroughs in the past few decades.
Traditional strain sensors have their own defects, such as poor toughness, and their application in the monitoring of large strains and complex structures is increasingly unable to meet people's needs. Therefore, the development of strain sensors with high sensitivity, low cost and easy use is very important. necessary
But the graphene-based surface strain sensor that this method makes has no emulsion layer between the substrate and the graphene layer, and the graphene nanosheets are not packed tightly, and the graphene nanosheets are easy to come off from the substrate.

Method used

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  • Graphene-based strain sensing film and preparation method and application thereof
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  • Graphene-based strain sensing film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Measure 10ml PX 7026X ap (solid content 50%) was added to 10mL deionized water, and after magnetic stirring for 10min, a diluted emulsion was obtained. Take 1.5mL of the above-mentioned diluted emulsion, and spray it on the rubber sheet substrate with a spray gun to facilitate strain transmission. Sensitivity test, in which the size of the rubber sheet is 100mm×15mm, and the amount of emulsion spraying is about 555g / m 2 ;

[0043] (2) Weigh 500mg of graphene raw material as C750 (XG Science Inc., USA) and add it to 1000mL of deionized water, after magnetic stirring for 30min, ultrasonic treatment for 2h to obtain graphite with good dispersibility and a concentration of 0.5mg / mL olefin dispersion, the spraying amount is 0.1g / m 2 , using a spray gun to spray a graphene dispersion on the emulsion coating to form a graphene film;

[0044] (3) Take 0.45mL of the emulsion diluted in (1), and spray it on the graphene film with a spray gun. The amount of emulsion sprayi...

Embodiment 2

[0047] (1) Measure 10ml PX 7026X ap (solid content 50%) was added to 10mL deionized water, and after magnetic stirring for 10min, a diluted emulsion was obtained. Take 1.5mL of the above-mentioned diluted emulsion, and spray it on the rubber sheet substrate with a spray gun to facilitate strain transmission. Sensitivity test, in which the size of the rubber sheet is 100mm×15mm, and the amount of emulsion spraying is about 555g / m 2 ;

[0048] (2) Weigh 500mg of graphene raw material as C750 (XG Science Inc., USA) and add it to 1000mL of deionized water, after magnetic stirring for 30min, ultrasonic treatment for 2h to obtain graphite with good dispersibility and a concentration of 0.5mg / mL olefin dispersion, the spraying amount is 0.1g / m 2 , using a spray gun to continue spraying the graphene dispersion on the emulsion coating to form a graphene film;

[0049] (3) Take 0.75mL of the emulsion diluted in (1), and spray it on the graphene film with a spray gun. The amount of e...

Embodiment 3

[0052] (1) Measure 10ml PX 7026X ap (solid content 50%) was added to 10mL deionized water, and after magnetic stirring for 10min, an emulsion was obtained. Take 1.5mL of the above emulsion, and use a spray gun to spray it on the rubber sheet substrate to facilitate the test of strain sensing performance. The size of the rubber sheet is 100mm×15mm, and the amount of emulsion spraying is about 555g / m 2 ;

[0053] (2) Weigh 500mg of graphene raw material as C750 (XG Science Inc., USA) and add it to 1000mL of deionized water, after magnetic stirring for 30min, ultrasonic treatment for 2h to obtain graphite with good dispersibility and a concentration of 0.5mg / mL olefin dispersion, the spraying amount is 0.1g / m 2 , using a spray gun to continue spraying the graphene dispersion on the emulsion coating to form a graphene film;

[0054] (3) Take 3mL of the emulsion in (1), and use a spray gun to spray it on the graphene film. The amount of emulsion spraying is about 1110g / m 2 ; ...

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Abstract

The invention relates to a graphene-based strain sensing film and a preparation method and an application thereof. The strain sensing film is a composite coating film formed by an upper emulsion coating, a lower emulsion coating and an intermediate graphene coating, wherein both ends of the film are connected to a wire, the upper emulsion coating and the lower emulsion coating are prepared from an acrylate emulsion polymer, and the graphene coating is prepared from a graphene dispersion liquid. Compared with the prior art, the graphene-based strain sensing film can operate on any shapes of substrates, the method is simple and the cost is low; the graphene dispersion liquid is used to act as a raw material, electrical and mechanical properties of graphene are directly utilized, and the technological process is simplified; the emulsion coating is sprayed, so that the graphene coating is effectively protected from being damaged, the service life of the strain sensing film is prolonged, the reusability and the weather resistance of the strain sensing film are improved, and no adverse effects are imposed on the appearance of the strain sensing film at the same time because the applied polymer emulsion has high transparency after film formation; and the sensitivity of the strain sending film can be set at will according to requirements.

Description

technical field [0001] The invention belongs to the field of graphene nanomaterials, and in particular relates to a graphene-based strain sensing film and its preparation method and application. Background technique [0002] Strain sensor is a functional device that measures the strain generated by the force deformation of an 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. Traditional strain sensors have their own defects, such as poor toughness, and their applications in the monitoring of large strains and complex structures are increasingly unable to meet people's needs. Therefore, the development of highly sensitive, low-cost, and easy-to-use strai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
Inventor 张东李苗苗
Owner TONGJI UNIV
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