期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 24, 页码 22553-22560出版社
AMER CHEMICAL SOC
DOI: 10.1021/am506674u
关键词
gas sensor; Co-doping; ZnO nanowires; selectivity; xylene
资金
- National Research Foundation of Korea (NRF) grant - Korea Government (MEST) [2013R1A2A1A01006545]
- ARCNEX from NRF of Korea - MEST [2011-0031933]
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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