Enhanced H2S gas sensing properties of In2O3 nanowires

초록

We report the preparation and thermal annealing of SnO2-core/In2O3-shell nanorods using a two-step process comprising thermal evaporation of Sn powders and the sputter-deposition of In2O3. X-ray diffraction analysis revealed that the shells were crystallized by annealing. Photoluminescence measurements showed that the orange emission of the SnO2 nanorods was enhanced in intensity by sheathing them with In2O3 and further enhanced by annealing them. A reducing atmosphere was found to be more efficient in enhancing the orange emission intensity by annealing than an oxidizing atmosphere. The origin of the emission enhancement by annealing is also discussed.