Co-Doped Branched ZnO Nanowires for Ultraselective and Sensitive Detection of Xylene
- Authors
- Woo, Hyung-Sik; Kwak, Chang-Hoon; Chung, Jae-Ho; Lee, Jong-Heun
- Issue Date
- 24-12월-2014
- Publisher
- AMER CHEMICAL SOC
- Keywords
- gas sensor; Co-doping; ZnO nanowires; selectivity; xylene
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.6, no.24, pp.22553 - 22560
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 6
- Number
- 24
- Start Page
- 22553
- End Page
- 22560
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/96449
- DOI
- 10.1021/am506674u
- ISSN
- 1944-8244
- Abstract
- Co-doped branched ZnO nanowires were prepared by multistep vapor-phase reactions for the ultraselective and sensitive detection of p-xylene. Highly crystalline ZnO NWs were transformed into CoO NWs by thermal evaporation of CoCl2 powder at 700 degrees C. The Co-doped ZnO branches were grown subsequently by thermal evaporation of Zn metal powder at 500 degrees C using CoO NWs as catalyst. The response (resistance ratio) of the Co-doped branched ZnO NW network sensor to 5 ppm p-xylene at 400 degrees C was 19.55, which was significantly higher than those to 5 ppm toluene, C2H5OH, and other interference gases. The sensitive and selective detection of p-xylene, particularly distinguishing among benzene, toluene, and xylene with lower cross-responses to C2H5OH, can be attributed to the tuned catalytic activity of Co components, which induces preferential dissociation of p-xylene into more active species, as well as the increase of chemiresistive variation due to the abundant formation of Schottky barriers between the branches.
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Collections - College of Science > Department of Physics > 1. Journal Articles
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