Current-voltage characteristics and selective CO detection of Zn2SnO4 and ZnO/Zn2SnO4, SnO2/Zn2SnO4 layered-type sensors
SCIE
SCOPUS
- Title
- Current-voltage characteristics and selective CO detection of Zn2SnO4 and ZnO/Zn2SnO4, SnO2/Zn2SnO4 layered-type sensors
- Authors
- Yu, JH; Choi, GM
- Date Issued
- 2001-01-25
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- The current-voltage characteristics and the CO gas-sensing properties of porous Zn2SnO4 were examined. ZnO/Zn2SnO4 and SnO2/Zn2SnO4 layered-type samples were also fabricated for the investigation of the interfacial effect between ZnO (or SnO2) and Zn2SnO4 by sequentially die-pressing respective powders. To form a stable contact between ZnO (or SnO2) and Zn2SnO4, the composition and thus the sinterability of ZnO (or SnO2) was controlled. The electrical and gas-sensing properties of the layered samples were compared with those of individual ZnO, SnO2 and Zn2SnO4. Zn2SnO4 showed the higher sensitivity values to CO gas than to H-2 gas at relatively low temperature. The sensitivity of Zn2SnO4 decreased with the increasing magnitude of applied voltage at high temperature. Both SnO2/Zn2SnO4 and ZnO/Zn2SnO4, layered-type samples showed the sensing characteristics varying with the direction of applied bias. The interface between Pt and Zn2SnO4 was responsible for the observed non-ohmic current-voltage characteristics and the resultant gas sensitivity. (C) 2001 Elsevier Science B.V. All rights reserved.
- Keywords
- ZnO; SnO2; Zn2SnO4; layered structure; CO sensor; GAS-SENSING PROPERTIES; SENSITIVITY; CERAMICS; CONTACT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19702
- DOI
- 10.1016/S0925-4005(00)00642-0
- ISSN
- 0925-4005
- Article Type
- Article
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, vol. 72, no. 2, page. 141 - 148, 2001-01-25
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