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

A graphene nanoribbon and ammonia sensor technology, applied in the field of ammonia sensors, can solve the problems of ammonia detection, short life, poor stability, etc., and achieve the effects of short recovery time, low energy consumption and high sensitivity

Active Publication Date: 2015-01-21
薛洁
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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 poly

Method used

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

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Embodiment 1

[0022] Example 1, 2.5 mg of graphene oxide nanobelts prepared by oxidizing and longitudinally exfoliating multi-walled carbon nanotubes were added to 30 milliliters of deionized water, and ultrasonic (power was 40 watts) was dispersed for 5 minutes to obtain a graphene oxide nanobelt solution; The graphene nanoribbon solution is placed in a filter membrane (cellulose acetate filter membrane) with a pore size of 0.44 micron in a suction filtration device, and is vacuum filtered so that the upper surface of the filter paper is uniformly attached to a layer of graphene oxide nanoribbon film, the filter paper is taken out, and After drying at 80°C for 1 hour, the filter paper was soaked in deionized water to keep it moist. as attached figure 1 , select the silicon wafer (2) that retains the natural oxide layer (3) with a thickness of 0.5 mm as the substrate, and clean the silicon wafer for 5 minutes in ultrasonic waves (power of 100 watts) with ethanol, acetone and deionized water...

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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...

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Application Information

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IPC IPC(8): G01N27/12
Inventor 薛洁张忠阳
Owner 薛洁
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