Hydrogen sensing using gold nanoclusters supported on tungsten trioxide thin films

Muhammad Ahmad, Vladimir Golovko, Rohul Adnan, Faridah Bakar, Jan-Yves Ruzicka, David Anderson, Gunther Andersson, Wojtek Wlodarski

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Controlled amounts of chemically synthesised gold (Au) nanoclusters were deposited onto tungsten trioxide (WO3) nanostructured thin films as sensors for hydrogen. The Au/WO3 thin films were characterised by XPS, XRD, SEM and TEM. Performance of Au/WO3 films was tested at operating temperatures varying from room temperature to 450 C. It was demonstrated that Au metal loading plays an important role in defining enhancement of the sensor response towards hydrogen. "Less is more" principle applies to the reported here sensors as materials made using lower concentration of Au nanoclusters demonstrated significantly better response. HRTEM images of the Au/WO3 thin films provide evidence that the more active sensors are enriched with smaller Au nanoparticles (≤5 nm). Fast response towards H2 within a wide range of industrially relevant concentrations, excellent baseline stability and signal reproducibility at optimized operating temperature demonstrate feasibility of this novel approach toward fabrication of sensors.

    Original languageEnglish
    Pages (from-to)12865-12877
    Number of pages13
    JournalInternational Journal of Hydrogen Energy
    Volume38
    Issue number29
    DOIs
    Publication statusPublished - 30 Sep 2013

    Keywords

    • Au nanoclusters
    • Highly sensitive
    • Hydrogen sensors
    • Reproducible
    • Tungsten trioxide

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