Abstract
A brand-new gas sensor nanocomposite, In2O3-InN, was synthesized by in-situ partial oxidation of InN and presented fast response–recovery property for NO2 detecting. The structure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray detection (EDX) analysis. The results show that the final In2O3-InN composites were composed of hexagonal type In2O3 and hexagonal type InN, which exhibited bottle nanotube structure on the relative macroscopic level. Microscopically, at the interface of In2O3 and InN, n–n hetero junction formed. Works form gas sensing property found that it is obviously that In2O3-InN got a quite stronger response, 1021, at relatively lower temperature, 100 °C, comparing to pure In2O3, 279.1 at 150 °C. After doping, the gas-sensing performance was improved. By analyzing the concentration of oxygen vacation and n–n hetero junctions mechanism, it was verified that the superiority of gas sensing properties of the In2O3-InN can be attributed to the high concentration of oxygen vacancies and the formation of n–n hetero junctions.
Highlights
Environmental Protection Administration [1]
By analyzing the concentration of oxygen vacation and n–n hetero junctions mechanism, it was verified that the superiority of gas sensing properties of the In2 O3 -InN can be attributed to the high concentration of oxygen vacancies and the formation of n–n hetero junctions
The following four instruments were used in the preparation of this experiment: KSY-419 box resistance furnace (Energy-saving Electric Furnace Factory, Shenyang, China); T09-1S magnetic stirrer (Sile Instrument, Shanghai, China); OTF-1200X vacuum tube type high temperature sintering furnace (Kejing Material Technology Co., Ltd., Hefei, China); and SK-G08123K vacuum tube type high temperature oxidation furnace (Zhonghuan Experimental Instrument Factory, Tianjin, China)
Summary
Environmental Protection Administration [1]. It mainly comes from the combustion of fuel and city automobile exhaust. Industrial production processes can produce some nitrogen dioxide [2]. With the increasingly serious air pollution, the monitoring situation of major atmospheric pollutants such as nitrogen oxides is becoming increasingly severe, and the sensitivity and anti-interference requirements for the NO2 detection system are increasing. With the development of new technology, new energy and new materials [3], the difficulty of preparing new functional materials that are completely different from traditional materials has become increasingly apparent [4]. How to synthesize new composite materials on the basis of traditional materials has gradually become the breakthrough point of current materials science [5]
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