화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.32, No.10, 435-441, October, 2022
DOI10.3740/MRSK.2022.32.10.435  Export Citation
ZnO가 첨가된 TeO2 나노와이어의 합성 및 저농도(50 ppm) 이산화질소 가스 센싱 특성
Synthesis and Low-concentration (50 ppm) NO2 Sensing Properties of Bare and ZnO (n) Decorated TeO2 (p) Nanowires
유동재, 신가윤, 엄완식, 강석우, 김은비, 김형민, 김현우†
  • 한양대학교 신소재공학부
Dong Jae Yu, Ka Yoon Shin, Wansik Oum, Suk Woo Kang, Eun Bi Kim, Hyeong Min Kim, and Hyoun Woo Kim†
  • Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
E-mail:
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:TeO2;ZnO;NO2;gas sensor;sensing mechanism
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