Abstract
In this paper, Zn-doped In2S3 flowers grow on the surface of the ceramic tube, and the surface was locally oxidized by injecting oxygen on the surface, so as to prepare Zn-doped In2S3/In2O3 composites with good sensing to ethanol gas. The characterization results showed that the composite has a hierarchical flower structure with uniform size (5–6 μm). Gas sensing tests exhibit that the sensor has outstanding response for ethanol gas. Zn doping and local oxidation significantly reduced the operating temperature of In2S3 from the original 240 °C–100 °C, and the gas sensing response of the sensor was also significantly improved. When the temperature is 100 °C, the response value of pure In2S3 sensor for 10 ppm ethanol gas is 3.55 and Zn/In2S3/In2O3 sensor's response value is increased to 22.82, which can be attributed to the increase of oxygen vacancy caused by Zn doping and the construction of In2S3/In2O3 heterojunction. Finally, density functional theory (DFT), as the theoretical basis of first-principle calculation, is used to calculate and analyze the gas-sensing enhancement mechanism of composite materials.
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