Impact of hydrogen on carrier mobility and concentration in graphene decorated with Pd nanoparticle

Akihito Goto, Go Takeuchi, Ryosuke Yamachi, Takahisa Tanaka, Tsunaki Takahashi, Ken Uchida

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    As a candidate of highly-sensitive hydrogen sensors, Palladium (Pd)-decorated graphene sensors have been investigated. Thanks to high reactivity of Pd nanoparticles to hydrogen and high surface-tovolume ratio of two-dimensionally layered graphene, graphene decorated with Pd nanoparticles can be used as a highly sensitive hydrogen sensor. Although the conductivity of Pd-graphene sensor is known to be greatly changed in hydrogen atmosphere, the mechanisms of conductivity change have not been fully understood. In this work, both carrier concentration and mobility in hydrogen are investigated using Hall effect measurement. It is shown that relative change of carrier concentration is greater when carrier concentration is lower. On the other hand, mobility is not systematically changed as a function of carrier concentration. This mobility behavior is attributed to the competition between greater effective mass and shorter screening length at higher carrier concentration. Based on these observations, we develop strategy for achieving high sensitivity in Pd graphene hydrogen sensor.

    Original languageEnglish
    Title of host publicationGraphene and Beyond
    Subtitle of host publication2D Materials
    PublisherElectrochemical Society Inc.
    Pages7-12
    Number of pages6
    Volume72
    Edition14
    ISBN (Electronic)9781607685395
    DOIs
    Publication statusPublished - 2016
    EventSymposium on Graphene and Beyond: 2D Materials - 229th ECS Meeting - San Diego, United States
    Duration: 2016 May 292016 Jun 2

    Other

    OtherSymposium on Graphene and Beyond: 2D Materials - 229th ECS Meeting
    CountryUnited States
    CitySan Diego
    Period16/5/2916/6/2

    ASJC Scopus subject areas

    • Engineering(all)

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  • Cite this

    Goto, A., Takeuchi, G., Yamachi, R., Tanaka, T., Takahashi, T., & Uchida, K. (2016). Impact of hydrogen on carrier mobility and concentration in graphene decorated with Pd nanoparticle. In Graphene and Beyond: 2D Materials (14 ed., Vol. 72, pp. 7-12). Electrochemical Society Inc.. https://doi.org/10.1149/07214.0007ecst