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

Dong Jae Yu; Ka Yoon Shin; Wansik Oum; Suk Woo Kang; Eun Bi Kim; Hyeong Min Kim; Hyoun Woo Kim

doi:10.3740/MRSK.2022.32.10.435

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2022 Vol.32, Issue 10 Preview Page Next Page

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

October 2022. pp. 435-441

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

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 32
No :10
Pages :435-441
Received Date : 2022-09-06
Revised Date : 2022-10-11
Accepted Date : 2022-10-11
DOI :https://doi.org/10.3740/MRSK.2022.32.10.435

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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