Attachment of Metal Nanoparticles to SnO2 Nanowires for Enhancement of Gas Sensing Properties
- Authors
- Kim, Hyoun Woo; Kwon, Yong Jung; Cho, Hong Yeon; Na, Han Gil
- Issue Date
- Nov-2014
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- SnO2; Nanowires; Co; Sensors; NO2
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.14, no.11, pp.8242 - 8247
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 14
- Number
- 11
- Start Page
- 8242
- End Page
- 8247
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158713
- DOI
- 10.1166/jnn.2014.9902
- ISSN
- 1533-4880
- Abstract
- We fabricated SnO2/cobalt (Co) core shell nanowires by means of a two-step process, for their application as chemical sensors. For Co-functionalization, we synthesized SnO2-Co core shell nanowires by the sputtering deposition of Co layers on the surface of networked SnO2 nanowires, subsequently transforming the continuous Co-shell layers into crystalline islands by thermal heating. While scanning electron microscopy (SEM) images of annealed core shell nanowires exhibited a rough surface, transmission electron microscopy (TEM) images revealed that the roughness is related to the agglomeration of the sputtered Co layer. The X-ray diffraction (XRD) pattern and lattice-resolved TEM images coincidentally indicated that the agglomerated particles are comprised of a hexagonal Co phase. The NO2 sensing test revealed that the sensor response was enhanced by decoration with Co nanoparticles. In addition, both response and recovery times tended to decrease as a result of the Co-functionalization. This indicates that the Co-functionalized SnO2 nanowire sensors can be used to sense gases at very low concentrations. We discussed possible mechanisms for enhancing sensor properties by Co-functionalization. The NO2 gas sensing test demonstrated the ability of the Co-functionalization to provide higher sensitivity, shorter response time, and shorter recovery time than would bare SnO2 nanowires.
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