Structure and NO<sub>2sub> gas sensing properties of SnO<sub>2sub>-core/In<sub>2sub>O<sub>3sub>-shell nanobelts
- 作者：Hyunsu Kim ; Soyeon An ; Changhyun Jin ; Chongmu Lee<sup> ; sup><sup>cmlee@inha.ac.krsup>
- 关键词：SnO2 ; In2O3 ; Nanobelts ; Sensor ; NO2
- 刊名：Current Applied Physics
- 出版年：2012
- 期刊代码：15_15671739
- 类别：ph
- 出版时间：July, 2012
- 卷：12
- 期：4
- 页码：1125-1130
- 文件大小：806 K
摘要
SnO<sub>2sub>-core/In<sub>2sub>O<sub>3sub>-shell nanobelts were fabricated by a two-step process comprising thermal evaporation of Sn powders and sputter-deposition of In<sub>2sub>O<sub>3sub>. Transmission electron microscopy and X-ray diffraction analyses revealed that the core of a typical core-shell nanobelt comprised a simple tetragonal-structured single crystal SnO<sub>2sub> and that the shell comprised an amorphous In<sub>2sub>O<sub>3sub>. Multiple networked SnO<sub>2sub>-core/In<sub>2sub>O<sub>3sub>-shell nanobelt sensors showed the response of 5.35%at a NO<sub>2sub> concentration of 10聽ppm at 300聽掳C. This response value is more than three times larger than that of bare-SnO<sub>2sub> nanobelt sensors at the same NO<sub>2sub> concentration. The enhancement in the sensitivity of SnO<sub>2sub> nanobelts to NO<sub>2sub> gas by sheathing the nanobelts with In<sub>2sub>O<sub>3sub> can be accounted for by the modulation of electron transport by the In<sub>2sub>O<sub>3sub>-In<sub>2sub>O<sub>3sub> homojunction.