Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 8, Pages 10006-10013Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.03.103
Keywords
SnO2 spheres; Cu doping; Gas sensing; First-principles calculation
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Funding
- National Natural Science Foundation of China [51202302, 11332013]
- Fundamental Research Funds for Central Universities [106112015CDJXY130013]
- JSPS [15H04114, 15K14117]
- CAS under Japan-China Scientific Cooperation Program
- Shorai Foundation for Science and Technology
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We report on the synthesis of pristine and Cu-doped SnO2 spheres using a facile hydrothermal method and investigate their microstructures and gas-sensing response. We focus on how Cu doping can have an impact on gas-sensing behavior of SnO2-based sensors toward H2S. We find that Cu doping can enhance significantly the gas response of SnO2 toward H2S, the origin of which can be clarified with a proposed adsorption model. First-principles calculations reveal that adsorption energy of H2S on Cu-doped surface is lower than that on undoped one and the interaction between adsorbed H2S and Cu-doped surface is stronger than that between adsorbed H2S and pure surface, which consequently improves gas-sensing performances of SnO2 toward H2S. Such a combined experimental and calculational study offers an explanation on how Cu doping affects gas-sensing performances of SnO2. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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