Exploration of the use of p-TeO2-branch/n-SnO2 core nanowires nanocomposites for gas sensing.
In: Applied Surface Science, Jg. 484 (2019-08-01), S. 1102-1110
Online
academicJournal
Zugriff:
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, TeO 2 -branched SnO 2 NWs were produced by a two-step catalyst-assisted vapor-liquid-solid (VLS) growth technique for gas sensing studies. First, SnO 2 NWs were synthesized from highly pure Sn powders, and TeO 2 branches were subsequently added. The fabricated samples were well characterized in terms of morphology, crystallinity, and chemical composition. Gas sensing results exhibited the enhanced NO 2 sensing capability of TeO 2 branched SnO 2 NW sensors relative to pristine SnO 2 NWs. In particular, the maximum responses (R g /R a) of pristine and TeO 2 branched SnO 2 sensors to 10 ppm NO 2 were 6.34 and 10.25, respectively. Furthermore, dynamics of TeO 2 branched sensor at the optimal temperature was faster. Superior sensing properties of TeO 2 branched SnO 2 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. • We fabricated p-n heterojunction TeO 2 branched SnO 2 NWs by a two-step gold-assisted VLS growth method for NO 2 gas sensing. • Superior sensing was related to the high surface area of the branched sensors and creation of p-n heterojunctions. • Sensor responses of pristine and TeO 2 branched SnO 2 sensors to 10 ppm NO 2 at 100 °C were 5.26 and 10.25, respectively. [ABSTRACT FROM AUTHOR]
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Exploration of the use of p-TeO2-branch/n-SnO2 core nanowires nanocomposites for gas sensing.
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Autor/in / Beteiligte Person: | Choi, Myung Sik ; Bang, Jae Hoon ; Mirzaei, Ali ; Na, Han Gil ; Jin, Changhyun ; Oum, Wansik ; Kim, Sang Sub ; Kim, Hyoun Woo |
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Zeitschrift: | Applied Surface Science, Jg. 484 (2019-08-01), S. 1102-1110 |
Veröffentlichung: | 2019 |
Medientyp: | academicJournal |
ISSN: | 0169-4332 (print) |
DOI: | 10.1016/j.apsusc.2019.04.122 |
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