Enhancement of sensor response in graphene gas sensors by gate-induced field

Takahisa Tanaka, Takamune Yokoyama, Ken Uchida

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The effects of the gate-induced field on sensor response in functionalized graphene sensor have not been fully understood yet. In this letter, graphene sensors decorated with Pd nanoparticles were fabricated, and gate voltage dependences of drain current and sensor response to hydrogen were experimentally and numerically examined. The sensor response was enhanced in the gate-induced electron conduction regime, compared to that in hole conduction regime. By utilizing the non-equilibrium Green's function calculations, the origin of the response enhancement was modeled as asymmetric potentials for holes and electrons. We conclude that the sensor response of graphene can be enhanced using the gate-induced electric field in various types of graphene sensors.

    Original languageEnglish
    Article number8491313
    Pages (from-to)1924-1927
    Number of pages4
    JournalIEEE Electron Device Letters
    Volume39
    Issue number12
    DOIs
    Publication statusPublished - 2018 Dec 1

    Keywords

    • Gas sensors
    • gate-induced field
    • graphene
    • palladium
    • surface functionalization

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

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