期刊
RSC ADVANCES
卷 9, 期 14, 页码 7723-7728出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra00116f
关键词
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资金
- National Key R&D Program of China [2016YFA0202200]
- National Natural Science Foundation of China [11574335, 61471345, 51772213]
- Frontier Science Research Project (Key Programs) of Chinese Academy of Sciences [QYZDJ-SSW-SLH018]
Sub-stoichiometric WO3-x has provided an alternative platform to investigate oxygen vacancies in gas sensors based on metal-oxides. We present an experimental study on the influence of sub-stoichiometric WO3-x phase upon gas sensing performance. High-quality WO3-x nanostructures with several x values (WO3, W19O55, W5O14, W18O49) were synthesized and used to fabricate H2S gas sensors. Temperature programmed desorption of oxygen (O-2-TPD) shows that oxygen absorption behaviors of the as-prepared WO3-x nanostructures are affected by oxygen vacancies, which played a critical role in the detection of H2S at varying temperature range. We find that oxygen vacancies in sub-stoichiometric WO3-x facilitate the ionosorption process and in turn enhance the performance of the gas sensor.
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