Sensitive Room Temperature Photoluminescence-Based Sensing of H2S with Novel CuO–ZnO Nanorods

Xiao Liu, Baosheng Du, Ye Sun, Miao Yu, Yongqi Yin, Wei Tang, Chong Chen, Lei Sun, Bin Yang, Wenwu Cao, Michael N R Ashfold

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Abstract

Novel CuO nanoparticle-capped ZnO nanorods have been produced using a pulsed laser deposition (PLD) method. These nanorods are shown to grow by a CuO-nanoparticle-assisted vapour-solid-solid (V-S-S) mechanism. The photoluminescence (PL) accompanying ultraviolet illumination of these capped nanorod samples shows large variations upon exposure to trace quantities of H2S gas. The present data suggests that both the Cu-doped ZnO stem and the CuO capping nanoparticle contribute to optical H2S sensing with these CuO-ZnO nanorods. This study represents the first demonstration of PL-based H2S gas sensing, at room temperature, with sub-ppm sensitivity. It also opens the way to producing CuO-ZnO nanorods by a V-S-S mechanism using gas phase methods other than PLD.
Original languageEnglish
Pages (from-to)16379–16385
Number of pages7
JournalACS Applied Materials and Interfaces
Volume8
Issue number25
Early online date3 Jun 2016
DOIs
Publication statusPublished - 29 Jun 2016

Keywords

  • Cu-doped ZnO nanorods
  • heterostructure
  • pulsed laser deposition
  • vapour-solid-solid mode
  • gas sensing
  • optical sensor

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