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Preparation method of self-heating laser-induced graphene flexible NO2 gas sensor

A gas sensor and laser-induced technology, applied in the field of sensors, can solve the problems of small response and slow response/recovery process, and achieve the effects of short manufacturing cycle, reduced process complexity and simple method

Inactive Publication Date: 2020-08-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most high-sensitivity gas sensors have a small response when working at room temperature, and the response / recovery process is slow. It needs to be heated to accelerate the adsorption and desorption process of gas molecules, so an additional micro heater is required.

Method used

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  • Preparation method of self-heating laser-induced graphene flexible NO2 gas sensor
  • Preparation method of self-heating laser-induced graphene flexible NO2 gas sensor
  • Preparation method of self-heating laser-induced graphene flexible NO2 gas sensor

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preparation example Construction

[0036] Above-mentioned self-heating laser-induced graphene flexible NO gas sensor preparation method, the method steps are as follows:

[0037] (1) Cut the polyimide (Polyimide, PI) tape into a rectangular shape of appropriate size (it is better to completely cover the surface of the glass slide in step (2));

[0038] (2) Through hydrosol (such as common water-soluble gel containing PVA (polyvinyl alcohol), PVP (polyvinyl pyrrolidone), CMC (sodium carboxymethylcellulose), low modulus sodium silicate and cationic gum arabic, etc. Any glue can be dissolved in water again and quickly lose its adhesive properties) stick the PI tape obtained through step (1) to the surface of the glass slide;

[0039] (3) Use the high-energy laser to induce three-dimensional graphene patterns on the PI tape obtained in step (2), in which the square graphene patterns at both ends are the electrode connection areas, and the single-line graphene area is used as a bridge for the electrode connection ar...

Embodiment 1

[0043] In this embodiment, the self-heating laser-induced graphene flexible NO2 gas sensor includes an insulating region, an electrode region, a silver coating region and a gas-sensitive region, the insulating region is arranged at the bottom, and the electrode region is arranged at the insulating region On the upper surface, the left and right ends of the electrode area are provided with two electrode connection areas formed by laser-induced graphene, and the upper surface of the electrode connection area is coated with a silver coating to form a silver coating area.

[0044] The two electrode connection areas are connected together by the single-line graphene formed by laser-induced graphene; the area where the single-line graphene is located is directly the gas-sensitive area; the width of the single-line graphene is 60 μm; the two electrode connection areas and the single-line graphene form a barbell shape structure. The electrode connection area is a square structure with...

Embodiment 2

[0048] The difference between the technical solution of this embodiment and Embodiment 1 is that the concentration of the test gas is different. This embodiment only describes the different parts, and the same parts will not be repeated. The test gas in this embodiment is NO2, the test temperature in the gas sensitive area is 40°C, the test concentration is 0.2ppm, 0.4ppm, 0.6ppm, 0.8ppm, 1ppm, 2ppm, 5ppm, and it is found that the detection range of NO2 is relatively wide, and the resolution It has high rate and obvious response, which can meet the requirements of air quality monitoring and breath detection.

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Abstract

The invention relates to a preparation method of a self-heating laser-induced graphene flexible NO2 gas sensor. The gas sensor comprises an insulating region, an electrode region, a silver coating region and a gas sensitive region; the insulating region is arranged at the bottom end; the electrode region and the gas sensitive region are arranged on the upper surface of the insulating region; the silver coating region is arranged on the electrode connecting regions at the two ends of the electrode region; and the electrode region and the gas sensitive region are three-dimensional porous graphene patterns which are prepared through high-energy one-step induction of laser and have larger porosity structures. Due to the unique graphene three-dimensional structure size of the gas sensitive region, the step of additionally adding a gas sensitive material can be omitted, and gas adsorption with the same or even better effect is achieved. The method is beneficial to rapid desorption of NO2 gasmolecules, improves the use repeatability of the sensor, reduces the manufacturing cost, is short in manufacturing period and high in sensitivity, has the detection limit reaching 10ppb, and has a wide application prospect in the aspects of environmental monitoring and medical diagnosis.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a preparation method of a self-heating laser-induced graphene flexible NO2 gas sensor. Background technique [0002] Nitrogen dioxide (NO2) is a volatile and irritating toxic gas. According to the national standard "Occupational Exposure Limits of Hazardous Factors in the Workplace (GBZ2-2007)", the human NO2 exposure limit is 5mg / m 3 (2.54PPM). Even if the human body is exposed to nitrogen dioxide for a short time, lung function will be damaged; if exposed to nitrogen dioxide for a long time, the chance of respiratory infection will increase, and it may lead to permanent organic disease of the lungs. Human exhaled breath condensate also contains NO2, and studies have found that the higher the concentration of NO2 in the exhaled breath condensate, the higher the probability of acute attack of bronchial asthma. Therefore, a NO2 gas sensor with high sensitivity, flexibility, and low detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C01B32/184B82Y40/00
CPCB82Y40/00C01B32/184G01N27/127
Inventor 杨丽郑广浩姬华东王宏丽
Owner HEBEI UNIV OF TECH
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