Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 156, Issue 2, Pages 867-874Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.02.057
Keywords
Hetero-nanostructures; Sensor; CeO2; TiO2; Ethanol sensing characteristics
Funding
- National Natural Science Foundation of China [51072038, 50772025, 21001035, 21003041]
- Outstanding Youth Foundation of Heilongjiang Province [JC201008]
- Natural Science Foundation of Heilongjiang Province, China [F200828, E200839]
- Ministry of Science and Technology of China [2008DFR20420]
- Fundamental Research Funds for the Central Universities [HEUCFT1010, HEUCF101016]
- '973' National Key Basic Research Program of China [2007CB310500]
- Harbin Key Sci-tech Project [2010AA4BG004]
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Crystalline CeO2/TiO2 core/shell nanorods were fabricated by a hydrothermal method and a subsequent annealing process under the hydrogen and air atmosphere. The thickness of the outer shell composed of crystal TiO2 nanoparticles can be tuned in the range of 5-11 nm. The crystal core/shell nanorods exhibited enhanced gas-sensing properties to ethanol vapor in terms of sensor response and selectivity. The calculated sensor response based on the change of the heterojunction barrier formed at the interface between CeO2 and TiO2 is agreed with the experimental results, and thus the change of the heterojunction barrier at different gas atmosphere can be used to explain the enhanced ethanol sensing properties. (C) 2011 Elsevier B.V. All rights reserved.
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