High-quality indium oxide (In2O3) nanobelts were successfully synthesized without catalyst at low temperature ranged from 600 to 850°C using a simple physical vapor deposition. To synthesize the In 2O3 nanobelts, we employed a simple reaction of thermally evaporated indium vapor in a wet oxidizing environment. The In2O 3 nanobelts have diameters in the range of 20-200 nm and lengths over several hundreds micrometer. The synthesized nanobelts indicate high-purity and single-crystalline cubic structure. Most of In2O 3 nanobelts have 〈100〉 growth direction but some nanobelts have 〈110〉 growth direction. Photoluminescence spectra under excitation at 325 nm showed a strong and broad emission at 570 nm with a shoulder at 630 nm related to oxygen vacancies. We suggest that the synthesis of the In2O3 nanobelts follows the self-assisted growth mechanism in our method.
Bibliographical noteFunding Information:
The authors acknowledge the support of this research by the Ministry of Science, Technology of Korea through the National Research Laboratory Program, and Center for Nanotubes and Nanostructured Composites at SKKU in Korea.
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