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

    研究成果: Conference contribution

    2 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    ホスト出版物のタイトルGraphene and Beyond
    ホスト出版物のサブタイトル2D Materials
    出版社Electrochemical Society Inc.
    ページ7-12
    ページ数6
    72
    14
    ISBN(電子版)9781607685395
    DOI
    出版ステータスPublished - 2016
    イベントSymposium on Graphene and Beyond: 2D Materials - 229th ECS Meeting - San Diego, United States
    継続期間: 2016 5 292016 6 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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