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Enhancement of Ethanol Vapor Sensing of TiO2 Nanobelts by Surface Engineering
Abstract
TiO(2) nanobelts were prepared by a hydrothermal process, and the structures were manipulated by surface engineering, including surface coarsening by an acid-corrosion procedure and formation of Ag-TiO(2) heterostuctures on TiO(2) nanobelts surface by photoreduction. Their performance in the detection of ethanol vapor was then examined and compared by electrical conductivity measurements at varied temperatures. Of the sensors based on the four nanobelt samples (TiO(2) nanobelts, Ag-TiO(2) nanobelts, surface-coarsened TiO(2) nanobelts, and surface-coarsened Ag-TiO(2) nanobelts), they all displayed improved sensitivity, selectivity, and short response times for ethanol vapor detection, in comparison with sensors based on other oxide nanostructures. Importantly, the formation of Ag-TiO(2) heterostuctures on TiO(2) nanobelts surface and surface coarsening of TiO(2) nanobelts were found to lead to apparent further enhancement of the sensors sensitivity, as well as a decrease of the optimal working temperature. That is, within the present experimental context, the vapor sensor based on surface-coarsened Ag-TiO(2) composite nanobelts exhibited the best performance. The sensing mechanism was interpreted on the basis of the surface depletion model, and the improvement by oxide surface engineering was accounted for by the chemical sensitization mechanism. This work provided a practical approach to the enhancement of gas sensing performance by one-dimensional oxide nanomaterials.
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Citations
Cited by
Kapilashrami, M., Zhang, Y., Liu, Y.-S., Hagfeldt, A., & Guo, J. (2014) · Chemical Reviews · doi:10.1021/cr5000893 · Cited by 508
Structure, Synthesis, and Applications of TiO2 Nanobelts
Zhao, Z., Tian, J., Sang, Y., Cabot, A., & Liu, H. (2015) · Advanced Materials · doi:10.1002/adma.201405589 · Cited by 342
Self-citationAg2V4O11 nanostructures for highly ethanol sensitive performance
Liang, Y., Zhu, L. F., Liu, P., Li, H. B., Xiao, J., Ji, X. W., & Yang, G. W. (2013) · CrystEngComm · doi:10.1039/c3ce40787j · Cited by 19
Metadata
- Authors
- Hu, P., Du, G., Zhou, W., Cui, J., Lin, J., Liu, H., Liu, D., Wang, J., & Chen, S.
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-10-22
- Volume
- 2
- Issue
- 11
- Pages
- 3263-3269
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2101304410
- Cited by
- 197
- References
- 0
- FWCI
- 10.47
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hu, P., Du, G., Zhou, W., Cui, J., Lin, J., Liu, H., Liu, D., Wang, J., & Chen, S. (2010). Enhancement of Ethanol Vapor Sensing of TiO2 Nanobelts by Surface Engineering. ACS Applied Materials & Interfaces. https://doi.org/10.1021/am100707h
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