Exploration of the use of p-TeO₂-branch/n-SnO₂ core nanowires nanocomposites for gas sensingExploration of the use of p-TeO2-branch/n-SnO2 core nanowires nanocomposites for gas sensing
- Other Titles
- Exploration of the use of p-TeO2-branch/n-SnO2 core nanowires nanocomposites for gas sensing
- Authors
- Choi, Myung Sik; Bang, Jae Hoon; Mirzaei, Ali; Na, Han Gil; Jin, Changhyun; Oum, Wansik; Kim, Sang Sub; Kim, Hyoun Woo
- Issue Date
- Aug-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Branched NWs, TeO2; SnO2; Sensing mechanism; Gas sensor
- Citation
- APPLIED SURFACE SCIENCE, v.484, pp.1102 - 1110
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 484
- Start Page
- 1102
- End Page
- 1110
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/13237
- DOI
- 10.1016/j.apsusc.2019.04.122
- ISSN
- 0169-4332
- Abstract
- Branched nanowires (NWs) are a novel class of composite materials with increased surface area relative to their pristine one-dimensional counterparts. Accordingly, they are good choice for gas sensing studies. In this study, p-n, TeO₂-branched SnO₂ NWs were produced by a two-step catalyst-assisted vapor-liquid-solid (VLS) growth technique for gas sensing studies. First, SnO₂ NWs were synthesized from highly pure Sn powders, and TeO₂ branches were subsequently added. The fabricated samples were well characterized in terms of morphology, crystallinity, and chemical composition. Gas sensing results exhibited the enhanced NO₂ sensing capability of TeO₂ branched SnO₂ NW sensors relative to pristine SnO₂ NWs. In particular, the maximum responses (Rg/Ra) of pristine and TeO₂ branched SnO₂ sensors to 10 ppm NO₂ were 6.34 and 10.25, respectively. Furthermore, dynamics of TeO₂ branched sensor at the optimal temperature was faster. Superior sensing properties of TeO₂ branched SnO₂ NWs were related to the high surface area of the branched sensors and creation of p-n heterojunctions on the surfaces of this sensor. We believe that branching is a good way to realize gas sensors for practical usages.
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