Korean Journal of Materials Research (한국재료학회지)

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

ZnO가 첨가된 TeO2 나노와이어의 합성 및 저농도(50 ppm) 이산화질소 가스 센싱 특성

  • 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)
  • 유동재 (한양대학교 신소재공학부) ;
  • 신가윤 (한양대학교 신소재공학부) ;
  • 엄완식 (한양대학교 신소재공학부) ;
  • 강석우 (한양대학교 신소재공학부) ;
  • 김은비 (한양대학교 신소재공학부) ;
  • 김형민 (한양대학교 신소재공학부) ;
  • 김현우 (한양대학교 신소재공학부)
  • Received : 2022.09.06
  • Accepted : 2022.10.11
  • Published : 2022.10.27
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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

Acknowledgement

This work was supported by the Technology Innovation Program (20013726) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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