Self-catalytic growth of hierarchical In2O3 nanostructures on SnO2 nanowires and their CO sensing properties

Yung-Chiun Her; Ching-Kuo Chiang; Sen-Tsun Jean; Sing-Lin Huang

doi:10.1039/C1CE06086D

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Self-catalytic growth of hierarchical In₂O₃nanostructures on SnO₂nanowires and their CO sensing properties

Yung-Chiun Her,*^a Ching-Kuo Chiang,^a Sen-Tsun Jean^a and Sing-Lin Huang^a

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* Corresponding authors

^a Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan, R.O.C.
E-mail: ycho@dragon.nchu.edu.tw
Fax: +886-4-22857017
Tel: +886-4-22859112 ext. 506

Abstract

Brush-like hierarchical In₂O₃ nanostructures on SnO₂ nanowires have been synthesized by a two-step thermal vapor transport process. To elucidate the growth mechanism, the structural evolution of hierarchical In₂O₃ nanostructures during the synthesis process was carefully examined. The experimental results showed that a self-catalytic vapor–liquid–solid (VLS) growth mechanism was responsible for the growth of hierarchical In₂O₃ nanostructures. Compared with the film counterparts, the hierarchical In₂O₃ nanostructures exhibited a higher sensitivity to low-concentration CO, which can be attributed to more active centers on the surface obtained from the enhanced oxygen vacancy defects and formation of bridging point contacts in the random network between the two electrodes.

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Article information

DOI: https://doi.org/10.1039/C1CE06086D
Article type: Paper
Submitted: 23 Aug 2011
Accepted: 08 Nov 2011
First published: 30 Nov 2011

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CrystEngComm, 2012,14, 1296-1300

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Self-catalytic growth of hierarchical In₂O₃ nanostructures on SnO₂ nanowires and their CO sensing properties

Y. Her, C. Chiang, S. Jean and S. Huang, CrystEngComm, 2012, 14, 1296 DOI: 10.1039/C1CE06086D

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