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http://dx.doi.org/10.3740/MRSK.2022.32.10.435

Synthesis and Low-concentration (50 ppm) NO2 Sensing Properties of Bare and ZnO (n) Decorated TeO2 (p) Nanowires  

Yu, Dong Jae (Division of Materials Science and Engineering, Hanyang University)
Shin, Ka Yoon (Division of Materials Science and Engineering, Hanyang University)
Oum, Wansik (Division of Materials Science and Engineering, Hanyang University)
Kang, Suk Woo (Division of Materials Science and Engineering, Hanyang University)
Kim, Eun Bi (Division of Materials Science and Engineering, Hanyang University)
Kim, Hyeong Min (Division of Materials Science and Engineering, Hanyang University)
Kim, Hyoun Woo (Division of Materials Science and Engineering, Hanyang University)
Publication Information
Korean Journal of Materials Research / v.32, no.10, 2022 , pp. 435-441 More about this Journal
Abstract
We report the synthesis and gas sensing properties of bare and ZnO decorated TeO2 nanowires (NWs). A catalyst assisted-vapor-liquid-solid (VLS) growth method was used to synthesize TeO2 NWs and ZnO decoration was performed using an Au-catalyst assisted-VLS growth method followed by a subsequent heat treatment. Structural and morphological analyses using X-ray diffraction (XRD) and scanning/transmission electron microscopies, respectively, demonstrated the formation of bare and ZnO decorated TeO2 NWs with desired phase and morphology. NO2 gas sensing studies were performed at different temperatures ranging from 50 to 400 ℃ towards 50 ppm NO2 gas. The results obtained showed that both sensors had their best optimal sensing temperature at 350 ℃, while ZnO decorated TeO2 NWs sensor showed much better sensitivity towards NO2 relative to a bare TeO2 NWs gas sensor. The reason for the enhanced sensing performance of the ZnO decorated TeO2 NWs sensor was attributed to the formation of ZnO (n)/ TeO2 (p) heterojunctions and the high intrinsic gas sensing properties of ZnO.
Keywords
$TeO_2$; ZnO; $NO_2$; gas sensor; sensing mechanism;
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