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Graphene composite material and sensor and application thereof

A composite material and graphene technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of sensor instability and high operating temperature, and achieve excellent repeatability and selectivity.

Pending Publication Date: 2021-10-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum disulfide (MoS 2 ) is the most typical two-dimensional transition metal sulfide, which is of great significance for improving the gas-sensing performance of graphene composites, but its sensors have disadvantages such as instability and high operating temperature.

Method used

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  • Graphene composite material and sensor and application thereof
  • Graphene composite material and sensor and application thereof
  • Graphene composite material and sensor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one graphene composite material

[0021] Graphene quantum dots (GQDs) were prepared, and the experimental steps were as follows: Weigh 1 g of benzopyrene into a flask, add 80 ml of HNO 3 Solution (mass concentration 65%), put it at 80 °C for 12 h to complete the nitration reaction, take out the flask and cool it naturally, then use deionized water to filter the product until the filtrate becomes colorless to obtain the product 1 , 3,6-trinitropyrene; the above product 1,3,6-trinitropyrene was freeze-dried at -52 ℃ for 12 h, turned into a foam, and then weighed 1.5 g in 300 ml with a concentration of 2 mol / l NaOH aqueous solution, conventional ultrasonication for 3 h and magnetic stirring for 5 h, then poured into the reaction kettle, placed in an oven, and reacted at 200 °C for 8 h, cooled to room temperature and added deionized water, using 0.22 micron micro pore filter membrane for suction filtration; the filtrate was dialyzed for two days, and then rotary...

Embodiment 2

[0037] Embodiment 2 Sensor

[0038] The SEM image of the existing interdigitated electrodes is shown in image 3 , stick it on the metal base and conduct it with a wire, then drop 3 μL of gas-sensitive material water dispersion (concentration: 1 mg / ml) on the interdigital electrode, let it dry naturally and then vacuum-dry to obtain the sensor. The gas sensitive material is MoS 2 / rGO / GQDs composites, MoS 2 / rGO composites, MoS 2 / GQDs composite materials, MoS 2 materials, rGO materials or GQDs composites.

[0039] NO at room temperature 2 For gas detection, the gas sensor is in a closed space during the test, which effectively isolates the external environment. to NO 2 Gas is used as detection gas, and air is used to dilute NO 2 Obtain different concentrations of the gas to be tested. The test voltage is set to 5 mV, and the precise current information collected by the Agilent test instrument is integrated into an I-V diagram, from which the resistance value of the g...

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Abstract

The invention discloses a graphene composite material and a sensor and application thereof. The graphene composite material comprises molybdenum disulfide, graphene and graphene quantum dots. Specifically, the graphene composite material is composed of molybdenum disulfide, graphene and graphene quantum dots, has more active sites and is beneficial to gas adsorption, and the supporting substrate inhibits accumulation of molybdenum disulfide to a certain extent, so that the graphene composite material is an effective means for improving the gas-sensitive response performance of the material. Particularly, the problem that an existing molybdenum disulfide sensor can only detect nitrogen dioxide by heating is solved, nitrogen dioxide can be detected at the room temperature, and a test result shows that the MoS2 / rGO / GQDs composite material gas sensor is high in response value, the detection concentration is as low as 5ppb, the device still has 13.0% response value, and excellent repeatability and selectivity are achieved.

Description

technical field [0001] The invention belongs to gas sensor technology, and in particular relates to a graphene composite material and its sensor and application. Background technique [0002] As a member of the carbon material dot family, graphene quantum dots (GQDs) play a very unique role in material synthesis. Graphene oxide (GO) is a simple and easy-to-obtain raw material that does not pollute the environment. In addition, graphite Graphene has a large specific surface area and can provide abundant growth sites, and many other characteristics have also received great attention. Nowadays, more and more gas-sensing materials have been discovered, such as metal oxides, conductive polymers and various carbon-based materials, etc., because of their high specific surface area and good conductivity, they have become strong candidates for gas sensing application materials, among which Graphene has received extensive attention due to its unique properties since it was invented, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 王艳艳吴哲昆杨成张展搏彭长四
Owner SUZHOU UNIV