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Preparation method of patterned graphene gas sensitive sensor

A gas-sensing sensor and graphene technology, applied in the field of nano-sensors, can solve the problems of reduced graphene conductivity and difficult control of active groups, and achieve the effect of safety in the preparation process

Inactive Publication Date: 2019-07-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for preparing a patterned graphene gas sensor, which solves the defects that the existing methods of increasing graphene active sites have reduced electrical conductivity of graphene and difficult control of active groups

Method used

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preparation example Construction

[0023] In order to solve the technical problems existing in the background technology, the present invention provides a method for preparing a patterned graphene gas sensor, that is, using an ultrashort pulse laser to pattern the complete graphene so that it has a specific topological structure, each The edge of each topological structure contains abundant dangling bonds and vacancy defects. Different defect types have different adsorption characteristics for different gases, so that different gases can be selectively sensed by designing different topological structures.

[0024] A kind of preparation method of patterned graphene gas sensor provided by the invention comprises the following steps:

[0025] Step 1. Put the copper foil sample loaded with graphene into the corrosion solution to etch the copper foil. After the copper in the sample is completely etched, transfer the graphene to deionized water and soak for 30 minutes. Repeat this process for 2-3 times, and then the ...

Embodiment 1

[0036] The graphene on polydimethylsiloxane (PDMS) was square-etched by a picosecond laser, and the adsorption and desorption performance of the patterned graphene sample on formaldehyde was detected.

[0037] The preparation steps are as follows:

[0038] (1) Preparation of transparent substrate PDMS

[0039] Mix DC184 and curing agent in a ratio of 10:1, stir well to generate air bubbles, put it into an ultrasonic cleaning instrument until the air bubbles completely disappear, pour it into a mold (150mm*150mm*10mm), and place it in an oven at 80°C for 2 hours to cure .

[0040] (2) Graphene transfer

[0041] Prepare FeCl with a concentration of 0.5mol / l 3 / HCl solution is used to etch copper, and the graphene / copper foil with an area of ​​10mm*10mm is cut and placed on the surface of the etching solution. After etching for 2 to 4 hours, transfer the graphene to deionized water with filter paper, soak for 30 minutes, then transfer to new deionized water, soak for 30 minutes...

Embodiment 2

[0047] The graphene on polydimethylsiloxane (PDMS) was square-etched by a femtosecond laser, and the adsorption and desorption performance of the patterned graphene sample on formaldehyde was detected.

[0048] The preparation steps are as follows:

[0049] (1) Preparation of transparent substrate PDMS

[0050] Mix DC184 and curing agent in a ratio of 10:1, stir well to generate air bubbles, put it into an ultrasonic cleaning instrument until the air bubbles completely disappear, pour it into a mold (150mm*150mm*10mm), and place it in an oven at 80°C for 2 hours to cure .

[0051] (2) Graphene transfer

[0052] Prepare FeCl with a concentration of 0.5mol / l 3 / HCl solution is used to etch copper, and the graphene / copper foil with an area of ​​10mm*10mm is cut and placed on the surface of the etching solution. After etching for 2 to 4 hours, transfer the graphene to deionized water with filter paper, soak for 30 minutes, then transfer to new deionized water, soak for 30 minu...

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Abstract

The invention provides a preparation method of a patterned graphene gas sensitive sensor. The preparation method comprises the steps: firstly, graphene is patterned through pulse lasers, and the graphene with a topological structure is obtained; and finally, the graphene gas sensitive sensor is assembled through the graphene with the topological structure. By designing the topological structure with different pattern types and density, the graphene pattern-defect-gas sensitive sensing performance one-to-one-correspondence relation is established; and the preparation process is safe and free ofpollution and can be completed in an open environment at the constant temperature and the constant pressure.

Description

technical field [0001] The invention belongs to the field of nanometer sensors, in particular to a method for preparing a patterned graphene gas sensor. Background technique [0002] With the gradual development and progress of society and science and technology, people's material living standards have been greatly improved and improved. The emergence of environmental air pollution and corresponding safety hazards has caused huge property losses to the society, and has caused great threats and harm to people's health. Therefore, effective real-time monitoring of toxic and harmful gases in the atmosphere, people's living and working environments, and real-time detection of flammable and explosive gases in factories and companies is an important task to solve gas pollution and safety problems, and has great significance. social significance. This, in turn, places new demands on gas sensor technology. The sensors widely used now are mainly based on metal oxides and conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 叶晓慧齐明杨凯姚心成羊奕帆杨艳玲张荔侯小江冯雷锁国权
Owner SHAANXI UNIV OF SCI & TECH
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