Hydrothermal synthesis of hierarchical nanoparticle-decorated ZnO microdisks and the structure-enhanced acetylene sensing properties at high temperatures
✍ Scribed by Lexi Zhang; Jianghong Zhao; Jianfeng Zheng; Li Li; Zhenping Zhu
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 998 KB
- Volume
- 158
- Category
- Article
- ISSN
- 0925-4005
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✦ Synopsis
Nanoparticle-decorated ZnO microdisks showing a hierarchical structure were successfully synthesized through a citric acid-assisted hydrothermal process. The ZnO microdisks had a hexagonal wurtzite structure with high crystallinity. Sensors based on these microdisks exhibited high response values, fast response-recovery, good selectivity and long-term stability to 1-4000 ppm acetylene at 420 • C. In addition, even 1 ppm acetylene can be detected with high response (S = 7.9). The hierarchical structure can facilitate to fix the ZnO nanoparticles leading to a less aggregated configuration, which is expected to contribute much to the excellent acetylene sensing properties at high temperatures.