Characteristics of diamond electrolyte solution-gate FETs (SGFETs) and applications to biosensor

Kwang Soup Song, Hiroshi Kawarada

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    A diamond electrolyte solution-gate FET (SGFET) for use in electrolyte solutions has been fabricated for the first time. Perfect device characteristics (pinch-off and saturation in IDS-VDS) have been obtained with bias voltages within the potential window of diamond. The hydrogen-terminated (H-terminated) diamond surface was sensitive to halogen ions at approximately 30 mV/decade. We modified the H-terminated diamond surface with oxygen by treatment with ozone. Partially oxygen-terminated sites were insulating and insensitive to halogen ions. The H-terminated channel surface was modified to be partially amine-oxygen-terminated (H-A-O-terminated) to achieve pH sensitivity when irradiated with UV light in an ammonia solution. The pH sensitivity of a diamond surface modified was about 50 mV/pH unit from pH 2 to 10. We immobilized specific enzymes (urease and glucose oxidase) on the modified channel surface. The sensitivities to urea and glucose were approximately 30 mV/decade and 20 mV/decade, respectively.

    Original languageEnglish
    Article numberNDFCT 497
    Pages (from-to)325-335
    Number of pages11
    JournalNew Diamond and Frontier Carbon Technology
    Volume15
    Issue number6
    Publication statusPublished - 2005

    Fingerprint

    Diamond
    Field effect transistors
    bioinstrumentation
    Biosensors
    Electrolytes
    Diamonds
    field effect transistors
    diamonds
    electrolytes
    Hydrogen
    Halogens
    Oxygen
    glucose
    halogens
    sensitivity
    oxygen
    hydrogen
    Ions
    Glucose Oxidase
    Glucose oxidase

    Keywords

    • Biosensor
    • Diamond SGFETs
    • Enzyme
    • Halogen ions
    • pH

    ASJC Scopus subject areas

    • Surfaces, Coatings and Films
    • Surfaces and Interfaces
    • Materials Science(all)

    Cite this

    Characteristics of diamond electrolyte solution-gate FETs (SGFETs) and applications to biosensor. / Song, Kwang Soup; Kawarada, Hiroshi.

    In: New Diamond and Frontier Carbon Technology, Vol. 15, No. 6, NDFCT 497, 2005, p. 325-335.

    Research output: Contribution to journalArticle

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