The Gas Sensing Properties Of In₂O₃-Based Micro/Nanomaterials

Metal Oxide Semiconductor have attracted much attention due to their easy fabrication procedures,low cost,and high gas sensing efficiency in the field of enviromental monitoring.In this paper,the research work focuses on gas molecule optimization,electronic transmission and interfacial modification,especially on the improvement of charge separation and transport in gas sensor,so as to enhance the conversion efficiency of gas sensor.The structure,morphology,gas sensing properties and the photocatalytic performances were characterized to deeply understand the working mechanisms of In₂O₃ gas sensor.The main research results are as follows:1.Research on Zn-doped In₂O₃ for gas sensorZn-doped In₂O₃ nano spheres were synthesized by hydrothermal synthesis method.XRD,SEM,and XPS were respectively used to characterize surface crystallinity and morphology.The Zn-doped In₂O₃ nano spheres exhibit highly sensitive and selective sensing properties to triethylamine?TEA?gas.The response can reach to be 267 for 500 ppm TEA gas,which is much higher than that of pure In₂O₃.We proposed the enhanced gas sensing performances by doping.The Zn doped In₂O₃ materials were also used as efficient photocatalysts and exhibited excellent degradation for MB.After Zn doping,the morphology of In₂O₃ spheres was transformed,the active sites of surface were improved,the conversion efficiency of gas sensor was enhanced.The Zn doped In₂O₃ materials exhibit better performance to glycol gas than that of undoped In₂O₃,showing an low working temperature.The response of Zn-doped In₂O₃ composite can reach to be 184for 100 ppm,which is about 9 times larger than that of the pristine.2.Research on ZnO/In₂O₃ composite for gas sensorPristine In₂O₃,ZnO and ZnO-In₂O₃ composite with porous micro-/nano structures were synthesized by hydrothermal method.Compared with different materials,the ZnO-In₂O₃composite shows the improvement response for target gas.The sensor response on 200 ppm ethanol for ZnO-In₂O₃ composite is about 65,which is about 3 times larger than that of the pristine In₂O₃.The results show that ZnO-In₂O₃ composite structure can enhance the gas sensitive properties of the sensor.3.Research on Sn-doped In₂O₃ for gas sensorPristine In₂O₃ and Sn-doped In₂O₃ composite were uniformly grown on the Al₂O₃ planar electrode.The results show that the amount of Sn doping could change the size of In₂O₃spheres,so as to increase the specific surface area.The results show that Sn-doped In₂O₃composite exhibited excellent gas sensitivity for IPA gas.The response of Sn-doped In₂O₃composite?S1?can reach to be 71.06 for 100 ppm IPA gas at 200??...