Nanoscale Pt thin film sensor for accurate detection of ppm level hydrogen in air at high humidity

Takahisa Tanaka, Shinsuke Hoshino, Tsunaki Takahashi, Ken Uchida

    研究成果: Article査読

    24 被引用数 (Scopus)

    抄録

    Hydrogen is an important biomarker for the human digestive system. However, accurate detection of ppm-level hydrogen in breath is difficult due to the competing detection of high concentration water. We fabricated Pt thin films that respond to hydrogen in air at concentrations as low as 500 ppb. In both dry and humid air, these films have almost identical response to hydrogen, i.e., their resistance decreases linearly with increasing hydrogen concentration regardless of relative humidity. Even at high relative humidity, these Pt thin films can detect ppm-level hydrogen. Furthermore, it was strongly suggested that these films can be applied to low-level hydrogen in the air expired by a healthy human. Based on the chemical kinetics, namely the adsorption and desorption of hydrogen and oxygen, the sensor response is quantitatively described by relating the hydrogen surface coverage to the magnitude of electron scattering at the Pt surface. The proposed model successfully reproduces the effects of hydrogen concentration and time on the sensor response, particularly at hydrogen concentrations below 20 ppm. Based on this model, these Pt thin film sensors have the potential to detect 1 ppm hydrogen in expired air within 30 s.

    本文言語English
    ページ(範囲)913-919
    ページ数7
    ジャーナルSensors and Actuators, B: Chemical
    258
    DOI
    出版ステータスPublished - 2018 4月 1

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 器械工学
    • 凝縮系物理学
    • 表面、皮膜および薄膜
    • 金属および合金
    • 電子工学および電気工学
    • 材料化学

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