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Preparation method of graphene-based surface strain sensor

A strain sensor, graphene-based technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve the problems of difficult to prepare area thin film, unable to meet health detection, complicated preparation process, etc., to achieve low price, manufacturing The effect of low cost and simple operation

Inactive Publication Date: 2015-03-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene in this patent is obtained by deposition method, its manufacturing cost is relatively high, and the preparation process is relatively complicated
Moreover, this method is limited by the size of the atmosphere furnace cavity, and it is difficult to prepare a large-area film, which cannot meet the health detection of some large-area structures (such as glass curtain walls, concrete structures, etc.)

Method used

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  • Preparation method of graphene-based surface strain sensor
  • Preparation method of graphene-based surface strain sensor
  • Preparation method of graphene-based surface strain sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Take 50ml of the 1mg / ml graphene oxide solution, and add 250ml of ethanol thereto. Stably dispersed graphene oxide dispersions were prepared in water / ethanol solutions. Ultrasound for a while, take 6ml of uniform solution and add it to the airbrush spray can. The polytetrafluoroethylene substrate was cleaned, then dried, and placed on a heating platform to raise the temperature to 100°C. At this time, use a spray pen connected with an air pump to spray the above solution on the polytetrafluoroethylene substrate with an area of ​​2×10 cm, and the spray distance is about 5 cm. Graphene oxide films (such as Figure 1 ~ Figure 4 shown), and then utilize HI acid to reduce the film to form a graphene film. At the two ends of the graphene film, connect two copper electrodes with conductive glue, and connect an ohmmeter between the two electrodes; then on the graphene film Continue to spray a layer of styrene-acrylic emulsion to form a polymer latex film, that is, to obtain ...

Embodiment 2

[0038] A 0.2 mg / ml graphene oxide solution was prepared using ethanol solution as a dispersion medium. Ultrasound for a while, take 6ml of uniform solution and add it to the airbrush spray can. The silica gel substrate is cleaned and then dried. At this time, use a spray pen connected with an air pump to spray the above solution on the silica gel substrate with an area of ​​2×10 cm, and the spray distance is about 5 cm. Prepared a graphene oxide film, and then used HI acid to reduce the film to form a graphene film. At both ends of the graphene film, connect two copper electrodes with conductive glue, and connect an ohmmeter between the two electrodes; then spray a layer of Styrene emulsion. After the emulsion film was dried, the sensing performance test was carried out.

[0039] Among them, the sensitivity index Gauge factor (GF) is about 5 (GF=(R-R 0 ) / R 0 ε, where R represents the resistance before deformation, R 0 Indicates the resistance after deformation, ε indicat...

Embodiment 3

[0041]A 0.2 mg / ml graphene oxide solution was prepared using ethanol solution as a dispersion medium. Add carbon nanotubes wherein, make graphene oxide: the mass ratio of carbon nanotubes is 5: 1, after ultrasonic 30min, get 6ml this solution, add the titanium dioxide solution of 0.5mg / ml wherein (particle diameter: 5nm, sharp titanium ore) 2ml. At this time, use a spray pen connected with an air pump to spray the above solution on the polytetrafluoroethylene substrate with an area of ​​2×10 cm, and the spray distance is about 5 cm. A graphene oxide film / carbon nanotube / titanium dioxide composite film (such as Image 6 , Figure 7 shown). Irradiate under ultraviolet light for 10h, (wherein the ultraviolet lamp is 175W, and the sample is 15cm away from the lamp tube) to reduce to form a graphene film. At the two ends of the graphene film, connect two copper electrodes with conductive glue. Connect the ohmmeter between the electrodes; then spray a layer of styrene-acrylic em...

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Abstract

The invention relates to a preparation method of a graphene-based surface strain sensor. The method comprises the following steps: (1), preparing graphene oxide dispersion liquid; (2), spraying the graphene oxide dispersion liquid on a substrate to form a thin graphene oxide film; (3), carrying out chemical reduction or ultraviolet irradiation on the thin graphene oxide film to form a thin graphene film; (4), connecting two copper electrodes to the two ends of the thin graphene film by conducting resins and connecting an ohm gauge between the two electrodes; and (5), spraying or brushing a high molecular solution on the thin graphene film continuously to form a high-molecular latex film. Compared with the prior art, the thin graphene oxide film is prepared by spraying; reduction is carried out by using a certain means; and then the graphene-based surface strain sensor is prepared. Because the operation is simple, the cost is low, and large-scale preparation can be realized well, the preparation method can be applied to the heath monitoring of the building structure.

Description

technical field [0001] The invention relates to a preparation method of a graphene-based surface strain sensor, belonging to the technical field of functional thin films. Background technique [0002] Graphene has good transmittance, both theoretical calculation and experimental results show that its transmittance is 97.7%. Each carbon atom in graphene is sp 2 The hybrid orbital (σ bond) is connected to the other three carbon atoms, and the extremely strong C-C bond makes the graphene sheet have excellent mechanical properties. The remaining p-electron orbit is perpendicular to the graphene plane and forms a delocalized π-bond with the surrounding carbon atoms, so that electrons can move freely in the crystal, endowing graphene with good electrical properties. Its electron mobility can reach 2×10 5 cm 2 / (V s), is the material with the best conductivity at room temperature. During the stretching process of the graphene-based film, its structure is deformed, and there is...

Claims

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Application Information

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IPC IPC(8): G01B7/16
Inventor 张东李秀强
Owner TONGJI UNIV
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