Hysteresis-free nanoplasmonic pd-au alloy hydrogen sensors

Carl Wadell, Ferry Anggoro Ardy Nugroho, Emil Lidström, Beniamino Iandolo, Jakob Birkedal Wagner, Christoph Langhammer

    Research output: Contribution to journalJournal articleResearchpeer-review


    The recent market introduction of hydrogen fuel cell cars and the prospect of a hydrogen economy have drastically accelerated the need for safe and accurate detection of hydrogen. In this Letter, we investigate the use of arrays of nanofabricated Pd-Au alloy nanoparticles as plasmonic optical hydrogen sensors. By increasing the amount of Au in the alloy nanoparticles up to 25 atom %, we are able to suppress the hysteresis between hydrogen absorption and desorption, thereby increasing the sensor accuracy to below 5% throughout the investigated 1 mbar to 1 bar hydrogen pressure range. Furthermore, we observe an 8-fold absolute sensitivity enhancement at low hydrogen pressures compared to sensors made of pure Pd, and an improved sensor response time to below one second within the 0-40 mbar pressure range, that is, below the flammability limit, by engineering the nanoparticle size.
    Original languageEnglish
    JournalNano letters
    Issue number5
    Pages (from-to)3563-3570
    Number of pages8
    Publication statusPublished - 2015


    • Hydrogen sensing
    • Localized surface plasmon resonance
    • Plasmonic sensing
    • Alloy nanoparticles
    • Palladium


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