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 oC towards 50 ppm NO2 gas. The results obtained showed that both sensors had their best optimal sensing temperature at 350 oC, 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.

Abstract
1. 서 론
2. 실험 방법
    2.1. TeO2 NWs 합성
    2.2. ZnO 장식된 TeO2 NWs 합성
    2.3. 특성 분석
    2.3. 센서 제작 및 센싱 테스트
3. 결과 및 고찰
    3.1. 구조 및 형태 분석
    3.2. 가스 센싱 연구
    3.3. 가스 센싱 메커니즘
4. 결 론
Acknowledgement
References

• 유동재(한양대학교 신소재공학부) | Dong Jae Yu (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea)
• 신가윤(한양대학교 신소재공학부) | Ka Yoon Shin (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea)
• 엄완식(한양대학교 신소재공학부) | Wansik Oum (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea)
• 강석우(한양대학교 신소재공학부) | Suk Woo Kang (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea)
• 김은비(한양대학교 신소재공학부) | Eun Bi Kim (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea)
• 김형민(한양대학교 신소재공학부) | Hyeong Min Kim (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea)
• 김현우(한양대학교 신소재공학부) | Hyoun Woo Kim (Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea) Corresponding author