Reversible sensing of nitrogen dioxide using photoluminescent CdSe/ZnS quantum dots and enhanced response by combination with noble metals

DOI Web Site 被引用文献1件 参考文献24件 オープンアクセス
  • ANDO Masanori
    Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • INAGAKI Kosuke
    Faculty of Chemistry, Materials and Bioengineering, Kansai University
  • KAWASAKI Hideya
    Faculty of Chemistry, Materials and Bioengineering, Kansai University
  • SHIGERI Yasushi
    Department of Chemistry, Wakayama Medical University

抄録

<p>We report here a novel, sensitive detection method for nitrogen dioxide (NO2) using thin films of CdSe/ZnS core–shell type quantum dots (QDs) with and without noble metal (NM) nanoparticles (Au, Pt, or Pt-Pd alloy) deposited on a glass substrate. The photoluminescence (PL) intensity of the QD-only film and NM-QD composite films with porous microstructure rapidly decreased on exposure to NO2 (1–100 ppm) in air, and it reversibly recovered after the atmosphere was changed back to air without NO2. Interestingly, the Au-QD, Pt-QD, and Pt-Pd-QD films showed higher sensitivity when compared with the QD-only film. The reversible responses of QD-only film, Au-QD film, Pt-QD film, and Pt-Pd-QD film to NO2 in air suggested that the CdSe/ZnS QD film and NM-QD films could be promising PL-based optical NO2 sensors. Furthermore, the high NO2 sensitivity, but low ozone sensitivity, in the Pt-Pd-QD film suggests the possibility of recognizing these two oxidizing gases by using the gas-selective catalytic activity of Pd.</p>

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