pH-sensitive diamond field-effect transistors (FETs) with directly aminated channel surface

Kwang Soup Song, Yusuke Nakamura, Yuichi Sasaki, Munenori Degawa, Jung Hoon Yang, Hiroshi Kawarada

    Research output: Contribution to journalArticle

    39 Citations (Scopus)

    Abstract

    We have introduced pH sensors fabricated on diamond thin films through modification of the surface-terminated atom. We directly modified the diamond surface from hydrogen to amine or oxygen with ultraviolet (UV) irradiation under ammonia gas. The quantified amine site based on the spectra obtained by X-ray photoelectron spectroscopy (XPS) is 26% (2.6 × 1014 cm-2) with UV irradiation for 8 h and its coverage is dependent on the UV irradiation time. This directly aminated diamond surface is stable with long-term exposure in air and electrolyte solution. We fabricated diamond solution-gate field-effect transistors (SGFETs) without insulating layers on the channel surface. These diamond SGFETs with amine modified by direct amination are sensitive to pH (45 mV/pH) over a wide range from pH 2 to 12 and their sensitivity is dependent on the density of binding sites corresponding to UV irradiation time on the channel surface.

    Original languageEnglish
    Pages (from-to)3-8
    Number of pages6
    JournalAnalytica Chimica Acta
    Volume573-574
    DOIs
    Publication statusPublished - 2006 Jul 28

    Fingerprint

    Diamond
    Field effect transistors
    diamond
    irradiation
    Irradiation
    Amines
    Gates (transistor)
    pH sensors
    Amination
    Photoelectron Spectroscopy
    Diamond films
    Ammonia
    electrolyte
    Electrolytes
    X-ray spectroscopy
    Hydrogen
    X ray photoelectron spectroscopy
    ammonia
    Gases
    Binding Sites

    Keywords

    • Diamond
    • Directly aminated channel surface
    • pH sensors
    • Solution-gate field-effect transistors (SGFETs)
    • X-ray photoelectron spectroscopy (XPS)

    ASJC Scopus subject areas

    • Biochemistry
    • Analytical Chemistry
    • Spectroscopy
    • Environmental Chemistry

    Cite this

    pH-sensitive diamond field-effect transistors (FETs) with directly aminated channel surface. / Song, Kwang Soup; Nakamura, Yusuke; Sasaki, Yuichi; Degawa, Munenori; Yang, Jung Hoon; Kawarada, Hiroshi.

    In: Analytica Chimica Acta, Vol. 573-574, 28.07.2006, p. 3-8.

    Research output: Contribution to journalArticle

    Song, Kwang Soup ; Nakamura, Yusuke ; Sasaki, Yuichi ; Degawa, Munenori ; Yang, Jung Hoon ; Kawarada, Hiroshi. / pH-sensitive diamond field-effect transistors (FETs) with directly aminated channel surface. In: Analytica Chimica Acta. 2006 ; Vol. 573-574. pp. 3-8.
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    abstract = "We have introduced pH sensors fabricated on diamond thin films through modification of the surface-terminated atom. We directly modified the diamond surface from hydrogen to amine or oxygen with ultraviolet (UV) irradiation under ammonia gas. The quantified amine site based on the spectra obtained by X-ray photoelectron spectroscopy (XPS) is 26{\%} (2.6 × 1014 cm-2) with UV irradiation for 8 h and its coverage is dependent on the UV irradiation time. This directly aminated diamond surface is stable with long-term exposure in air and electrolyte solution. We fabricated diamond solution-gate field-effect transistors (SGFETs) without insulating layers on the channel surface. These diamond SGFETs with amine modified by direct amination are sensitive to pH (45 mV/pH) over a wide range from pH 2 to 12 and their sensitivity is dependent on the density of binding sites corresponding to UV irradiation time on the channel surface.",
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    AU - Nakamura, Yusuke

    AU - Sasaki, Yuichi

    AU - Degawa, Munenori

    AU - Yang, Jung Hoon

    AU - Kawarada, Hiroshi

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