Ammonia gas sensor based on polyaniline/graphene nanoribbons/silicon dioxide/silicon

Abstract

The invention belongs to the field of ammonia gas sensors, and in particular relates to an ammonia gas sensor based on polyaniline / graphene nanoribbons / silicon dioxide / silicon. A preparation method of the ammonia gas sensor comprises the following steps: transferring a graphene nanoribbon film onto a silicon wafer via a suction filtration method and a transfer printing method, and carrying out low-temperature reduction so as to obtain a graphene nanoribbon / silicon dioxide / silicon heterostructure material; then carrying out polyaniline modification on the surface of the heterostructure material via a chemical method; and finally, smearing silver colloid and an indium metal layer on the upper surface and the lower surface of the heterostructure material to serve as an upper electrode and a lower electrode, thereby preparing the ammonia gas sensor which is based on polyaniline / graphene nanoribbons / silicon dioxide / silicon and is excellent in ammonia gas sensitivity. The ammonia gas sensor does not require a heater and can work at room temperature, and also has the characteristics of low energy consumption, simple process, high sensitivity, short response and recovery time and the like. Thus, the ammonia gas sensor has important application prospect in the field of gas detection.

Description

technical field [0001] The invention belongs to the field of ammonia sensors, in particular to an ammonia sensor based on polyaniline / graphene nanobelt / silicon dioxide / silicon. Background technique [0002] Ammonia is a colorless gas with a strong pungent smell and is widely used in industry and medicine. However, ammonia gas is corrosive and can cause serious harm to the human respiratory tract, eyes and skin if inhaled or directly contacted. Therefore, it is of great significance to detect ammonia in people's production and life. [0003] In order to obtain safe, highly sensitive and low-cost gas sensors, various materials have been developed. In the past, most gas sensors were based on metal oxide and conductive polymer materials. Among them, some metal oxide sensors have attracted extensive attention because of their advantages such as simple preparation process and low price. However, since most metal oxides (such as ZnO, TiO 2 , SnO 2 etc.) need to work at high t...

AI Technical Summary

Problems solved by technology

However, since most metal oxides (such as ZnO, TiO 2 , SnO 2 etc.) need to work at high temperature to have high sensitivity to gas molecules, thus limiting the application of such sensors in many fields

In addition, conductive polymer gas sensors can work at room temperature, but have the disadvantages of short lifetime and poor stability

However, there is no report on the detection of ammonia gas using polyaniline / graphene nanoribbons / silica / silicon materials.

Images