Novel growth of CuO-functionalized, branched SnO2 nanowires and their application to H2S sensors
- Authors
- Kim, Sang Sub; Na, Han Gil; Choi, Sun-Woo; Kwak, Dong Sub; Kim, Hyoun Woo
- Issue Date
- May-2012
- Publisher
- IOP PUBLISHING LTD
- Citation
- JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.45, no.20, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Volume
- 45
- Number
- 20
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/165736
- DOI
- 10.1088/0022-3727/45/20/205301
- ISSN
- 0022-3727
- Abstract
- A novel growth method for CuO-functionalized, branched tin oxide (SnO2) nanowires was developed on the basis of a Cu-triggered tip-growth vapour-liquid-solid (VLS) process during annealing of Cu-coated SnO2 nanowires. The variation in annealing temperature changed the morphology, in which higher temperatures (>= 500 degrees C) are favourable for the formation of branches. From the observation of tip nanoparticles, we revealed that the growth of branches at 500 and 700 degrees C was dominated by base-growth and tip-growth VLS processes, respectively. The tip nanoparticles at 700 degrees C were mainly comprised of a CuO phase. We have demonstrated the potential applicability of the CuO-functionalized, branched SnO2 nanowires to H2S sensors. CuO functionalization significantly enhanced the response to H2S. In sharp contrast, it degraded the response to NO2, suggesting their selective sensing performance to H2S.
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