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Adsorption behaviors of gas molecules on the surface of ZnO nanocrystals under UV irradiation

  • QiuPing Zhang
  • GuangZhong Xie
  • HongFei Du
  • Jing Yang
  • YuanJie Su
  • HuiLing TaiEmail author
  • Ming XuEmail author
  • Kang Zhao
Article
  • 4 Downloads

Abstract

A UV-activated room temperature chemiresistive gas sensor based on ZnO nanocrystals film was fabricated. Its gas sensing properties under various conditions were also investigated in detail. The results shed new insight into the adsorption behaviors of gas molecules on the surface of ZnO nanocrystals under UV irradiation. The chemisorbed oxygen species (O 2(ads) (hv)) induced by UV light govern the adsorption and desorption ways of other gas molecules on the surface of ZnO nanocrystals, which is dependent on the electron affinity of gas molecules. Gas molecules with higher electron affinity than oxygen molecules can be adsorbed on the surface by the competitive adsorption way, extracting electrons from the surface. Gas molecules with lower electron affinity than oxygen molecules are attracted by the adsorbed O 2(ads) (hv) layer, releasing electrons to the surface. These processes can influence the gas sensing properties of the sensor. Our findings will pave the way for the fundamental understanding and design of UV-activated gas sensor in the future.

Keywords

adsorption behaviors electron affinity UV-activated gas sensor ZnO nanocrystals 

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Adsorption behaviors of gas molecules on the surface of ZnO nanocrystals under UV irradiation

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • QiuPing Zhang
    • 1
  • GuangZhong Xie
    • 1
  • HongFei Du
    • 1
  • Jing Yang
    • 1
  • YuanJie Su
    • 1
  • HuiLing Tai
    • 1
    Email author
  • Ming Xu
    • 2
    Email author
  • Kang Zhao
    • 1
  1. 1.State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China (UESTC)ChengduChina
  2. 2.Key Laboratory of Information Materials of Sichuan Province, School of Electrical and Information EngineeringSouthwest University for NationalitiesChengduChina

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