Preparation and NO2-gas sensing property of individual β-Ga2O3 nanobelt

• Published in: Chinese physics B Vol. 19; no. 7; pp. 404 - 407
• Main Author: 马海林 范多旺 牛晓山
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2010
• Subjects: SAED; 二氧化氮分子; 传感特性; 氧化镓; 电子显微镜; 纳米带
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/7/076102

Monoclinic gallium oxide （βGa2O3） nanobelts are synthesized from gallium and oxygen by thermal evaporation in an axgon atmosphere and their NO2 sensing properties are studied at room temperature. Electron microscopy studies show that the nanobelts have breadths ranging from 30 to 50 nm and lengths up to tens of micrometers. Both the x-ray diffraction （XRD） and the selected are electron diffraction （SAED） examinations indicate that β-Ga203 nanobelts have grown into single crystals. Room temperature NO2 sensing tests show that the current of individual β-Ga2O3 nanobelt decreases quickly, and then gently when the NO2 concentration increases from low to high. It is caused by the NO2 molecule chemisorption and desorption processes in the surface of β-Ga2O3 nanobelt.