Attachment of Co₃O₄ layer to SnO₂ nanowires for enhanced gas sensing properties
- Authors
- Kwon, Yong Jung; Na, Han Gil; Kang, Sung Yong; Choi, Myung Sik; Bang, Jae Hoon; Kim, Tae Whan; Mirzaei, Ali; Kim, Hyoun Woo
- Issue Date
- Feb-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- SnO2; Nanowires; Co3O4; Sensors; NO2
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.239, pp.180 - 192
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 239
- Start Page
- 180
- End Page
- 192
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/20571
- DOI
- 10.1016/j.snb.2016.07.177
- ISSN
- 0925-4005
- Abstract
- We prepared nanocomposites of n-SnO₂/p-Co₃O₄ for application in chemical sensors. In order to fabricate p-Co₃O₄-decorated n-SnO₂ nanowires, we sputtered a Co layer and subsequently annealed the material in air ambient. Characterization revealed that crystalline cubic Co₃O₄ with a tubular-like structure was attached to the surface of SnO₂ core nanowires. We carried out sensing tests at 573 K in at NO₂ gas concentrations ranging between 2 and 10 ppm. The sensor response was increased both by adding the Co₃O₄ layer and also by decreasing the thickness of the Co₃O₄ layer from 19.2 to 6.4 nm. We proposed possible mechanisms to explain the enhanced sensor properties obtained by Co₃O₄-functionalization. Co₃O₄-functionalized SnO₂ nanowires exhibited a higher sensor response than pristine nanowires, not only due to the heterostructure-induced depletion of n-SnO₂ region but also due to the surface effects of Co₃O₄. The generation of hole-accumulated Co₃O₄ layer in case of thicker-layered nanowires will decrease the sensor response. We demonstrated that Co₃O₄-functionalized SnO₂ nanowire sensors can be used as gas sensors at very low concentrations.
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