Heterojunction gas sensors for environmental NO2 and CO2 monitoring

Z. Ling, C. Leach, R. Freer

    Research output: Contribution to journalArticlepeer-review


    The NO2 and CO2 sensing properties of a heterojunction gas sensor formed between n-type ZnO and a p-type composite based on a mixture of BaTiO3/CuO/La2O3 have been evaluated and compared with the performance of its component p- and n-type materials. It was found that the individual ZnO and BaTiO3/CuO/La2O3 sensors showed resistance increases when exposed to NO2. When exposed to CO2, the ZnO based sensor showed no response, while the BaTiO3/CuO/La2O3 sensor showed a small resistance increase. The heterojunction sensor was found to be insensitive to <3000 ppm CO2 although at higher concentrations it showed a small decrease in resistance. The resistance also decreased when exposed to low levels of NO2, indicating that a different detection mechanism was operative at the heterocontact compared with the single-phase materials. © 2001 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)1977-1980
    Number of pages3
    JournalJournal of the European Ceramic Society
    Issue number10-11
    Publication statusPublished - 2001


    • BaTiO3 and titanates
    • Electrical properties
    • Interfaces
    • ZnO


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