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Synthesis and gas sensing characteristics of highly crystalline ZnO-SnO2 core-shell nanowires
- Authors
- Hwang, In-Sung; Kim, Sun-Jung; Choi, Joong-Ki; Choi, Jaewan; Ji, Hyunjin; Kim, Gyu-Tae; Cao, Guozhong; Lee, Jong-Heun
- Issue Date
- 15-7월-2010
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- ZnO-SnO2; Core-shell nanowires; Gas sensors; NO2 sensor; C2H5OH sensor
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.148, no.2, pp.595 - 600
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 148
- Number
- 2
- Start Page
- 595
- End Page
- 600
- ISSN
- 0925-4005
- Abstract
- The ZnO-SnO2 core-shell nanowires (NWs) were synthesized by a continuous two-step vapor growth method at different synthesis temperatures. A crystalline 15-20 nm-thick, SnO2 shell layer was pseudo-epitaxially coated on ZnO NWs with a diameter of 50-80 nm. The gas response of the ZnO-SnO2 core-shell NW sensor to 10 ppm NO2 reached similar to 33 times enhancement compared to that of the ZnO NWs at 200 degrees C. In addition, the ZnO-SnO2 core-shell NW sensors showed selective detection to NO2 at 200-300 degrees C and to C2H5OH at 400 degrees C. The enhanced gas responses to NO2 and C2H5OH are discussed in relation to the thin SnO2 shell layer and core-shell configuration of the NWs. (C) 2010 Elsevier B.V. All rights reserved.
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