Pencil drawing type NO2 sensing element and production method thereof

Abstract

The invention relates to a pencil drawing type NO2 sensing element and a production method of the pencil drawing type NO2 sensing element. The sensing element is composed of a comb-shaped conductive interdigital electrode (1), a pencil drawing sensing layer (2) and a paper substrate (3); the advantages of the printing technology and the material of a pencil (4) are combined; the production method comprises the steps of printing the comb-shaped conductive interdigital electrode (1) on the paper substrate (3) and drying and sintering in a drying box; drawing a NO2 sensing film on the paper substrate (3) with the comb-shaped conductive interdigital electrode (1), and finally obtaining the pencil drawing type NO2 sensing element. Compared with the prior art, the production process is simple and can be operated conveniently, the technological parameters can be controlled easily, the production process is free of pollution, the sensing film material can be taken easily, the cost is low, the electrical performance is stable, and the pencil drawing type NO2 sensing element has the characteristics of miniaturization, light and thin property and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of gas sensing elements, in particular to a pencil-drawing NO 2 Sensing element and method of making the same. Background technique [0002] At present, large and medium-sized cities around the world are facing the problem of vehicle exhaust pollution. Nitrogen oxides, as one of the exhaust emissions, have posed a serious threat to the environment and human health. my country's "Ambient Air Quality Standards" stipulates that NO in the atmosphere of human settlements 2 The daily average maximum allowable concentration is 0.15mg / m 3 (Third level standard). Therefore, it is urgent to develop suitable for low concentration NO 2 The sensing element for gas molecule detection meets the needs of the development of environmental detection. Preparation of a low detection limit, specific selectivity, fast response and recovery characteristics, high sensitivity NO 2 The sensing element becomes a very important ta...

AI Technical Summary

Problems solved by technology

Because the patent adopts the gas-jet film-forming process to deposit reduced graphene oxide and N-methylpyrrole thin films, the ink contains a large amount of liquid additives, and the residual solvent after deposition needs to be removed by evaporation, so the operation and treatment are more complicated

In addition, the silicon dioxide or silicon used is a hard substrate, which limits its application in flexible electronic devices. The gas-sensitive material used is reduced graphene oxide, which requires a complex chemical synthesis process.

In addition, the patent uses poly N-methylpyrrole as a selective layer for gas adsorption, and uses reduced graphene oxide as a gas-sensing material to test nitrogen dioxide gas molecules. Although this structure improves the NO 2 Gas selectivity, but detrimental to NO 2 Direct contact with the reduced graphene oxide gas-sensing material will greatly reduce the sensor's sensitivity to NO 2 Sensitivity to gases, in particular, can greatly increase sensor response and recovery times

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