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Printed type graphene-based NO2 gas-sensitive element and preparation method thereof

A graphene-based, gas sensor technology, applied in the direction of material resistance, etc., can solve the problems of rough preparation method, uncontrollable graphene sensitive layer thickness, poor performance of graphene-based gas sensor, etc., to achieve good gas sensing characteristics and sensitivity , low cost, good repeatability

Inactive Publication Date: 2014-08-20
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method is too rough to control the thickness of the graphene sensitive layer, resulting in poor performance of the graphene-based gas sensor

Method used

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  • Printed type graphene-based NO2 gas-sensitive element and preparation method thereof
  • Printed type graphene-based NO2 gas-sensitive element and preparation method thereof
  • Printed type graphene-based NO2 gas-sensitive element and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first step is to ultrasonically clean the PET substrate in deionized water, dry it, and etch the substrate with oxygen plasma, with an air flow of 100 sccm, a power of 100 W, and an etching time of 20 seconds;

[0031] The second step is to use gravure printing technology to print silver interdigitated electrodes on the PI substrate, and dry them in an oven at 120°C for 30 minutes;

[0032] The third step is to use gravure printing technology to print the graphene-based sensitive ink on the PI substrate with silver interdigitated electrodes, and mark the position of the substrate so that the graphene sensitive film completely covers the surface of the silver interdigitated electrodes. , put it in an oven and dry it at 80°C for 10 minutes to obtain a printed graphene-based NO 2 gas sensor.

[0033] figure 2 It is the printed graphene-based NO prepared in this embodiment 2 Gas sensor for 10,20,30,40,50ppm NO 2 The gas-sensing characteristics, the working conditio...

Embodiment 2

[0036] The first step is to ultrasonically clean the PI substrate in deionized water, dry it, and etch the substrate with oxygen plasma, with an air flow of 100sccm, a power of 100W, and an etching time of 20 seconds;

[0037] The second step is to use gravure printing technology to print silver interdigitated electrodes on the PI substrate, and dry them in an oven at 120°C for 30 minutes;

[0038] The third step is to use gravure printing technology to print the graphene-based sensitive ink on the PI substrate with silver interdigitated electrodes, and mark the position of the substrate so that the graphene sensitive film completely covers the surface of the silver interdigitated electrodes. , put it in an oven to dry at 80°C for 10 minutes, repeat the above operation according to the position of the substrate mark, and obtain a graphene-based NO layer with a multi-layer graphene sensitive layer. 2 gas sensor.

Embodiment 3

[0040] The first step is to ultrasonically clean the PI substrate in deionized water and dry it;

[0041] The second step is to use gravure printing technology to directly print the graphene-based sensitive ink on the PI substrate, and dry it in an oven at 80°C for 10 minutes to obtain a printed graphene-based NO ink. 2 gas sensor.

[0042] Among them, the graphene-based sensitive ink is prepared according to the following steps: uniformly disperse graphene in deionized water, control the concentration to 15-80 mg / mL, stir with low-speed magnetic force for 5-10 minutes, and then ultrasonically vibrate for 5-10 minutes; repeat the process Step 3-5 times are completely uniformly dispersed to obtain graphene-based sensitive ink.

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Abstract

The invention discloses a printed type graphene-based NO2 gas-sensitive element and a preparation method thereof. The preparation method comprises the following step: by fully combining the advantages of intaglio printing technology and graphene, sequentially printing a comb-type interdigital electrode and a graphene sensitive layer on a substrate, thus finally obtaining the printed type graphene-based NO2 gas-sensitive element. The printed type graphene-based NO2 gas-sensitive element has the following advantages that (1) the NO2 gas-sensitive element based on the comb-type interdigital electrode and the graphene sensitive layer has excellent gas-sensitive characteristic and sensitivity on NO2 under the room-temperature condition; (2) the printed type graphene-based NO2 gas-sensitive element is scientific in design, and stable in performance running, and can meet the demands of accurately and continuously monitoring the concentration of NO2 in a life environment in real time; (3) the graphene-based NO2 gas-sensitive element prepared by adopting a printing manner is simple in technology, convenient to operate, low in cost, and suitable for industrial mass production, and technology parameters are easy to control.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a printed graphene-based NO 2 Gas sensor and its preparation method. Background technique [0002] In recent years, with the rapid rise of my country's urban automobile consumption market, the environmental problems caused by nitrogen oxide (NOx) emissions have become increasingly prominent. NO 2 It is not only one of the main pollutants that cause environmental problems such as acid rain and smog, but also has a strong stimulating effect on the respiratory tract, seriously threatening the health of citizens. Therefore, for NO in the living environment 2 Real-time, accurate and continuous monitoring of the concentration is very necessary. [0003] Graphene, a hexagonal lattice structure with single-layer carbon atoms, has a large specific surface area, high electrical conductivity and low signal-to-noise ratio, and is very suitable as a NO 2 sensitive material. with tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 黄磊王振平林有杰李云香
Owner SHANGHAI NORMAL UNIVERSITY
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