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Enhanced H2S sensing characteristics of SnO2 nanowires functionalized with CuO

Authors
Hwang, In-SungChoi, Joong-KiKim, Sun-JungDong, Ki-YoungKwon, Jae-HongJu, Byeong-KwonLee, Jong-Heun
Issue Date
12-10월-2009
Publisher
ELSEVIER SCIENCE SA
Keywords
SnO2 nanowires; Gas sensors; CuO-SnO2; H2S detection; Selectivity
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.142, no.1, pp.105 - 110
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
142
Number
1
Start Page
105
End Page
110
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/119116
DOI
10.1016/j.snb.2009.07.052
ISSN
0925-4005
Abstract
The CuO-functionalized SnO2 nanowire (NW) sensors were fabricated by depositing a slurry containing SnO2 NWs on a polydimethylsiloxane (PDMS)-guided substrate and subsequently dropping Cu nitrate aqueous solution. The CuO coating increased the gas responses to 20 ppm H2S up to similar to 74-fold. The Ra/Rg value of the CuO-doped SnO2 NWs to 20 ppm H2S was as high as 809 at 300 degrees C, while the cross-gas responses to 5 ppm NO2, 100 ppm CO, 200 ppm C2H5OH, and 100 ppm C3H8 were negligibly low (1.5-4.0). Moreover, the 90% response times to H2S were as short as 1-2 s at 300-400 degrees C. The selective detection of H2S and enhancement of the gas response were attributed to the uniform distribution of the sensitizer (CuO) on the surface of the less agglomerated network of the SnO2 NWs. (c) 2009 Elsevier B.V. All rights reserved.
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공과대학 (전기전자공학부)
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