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

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)913-919
    Number of pages7
    JournalSensors and Actuators, B: Chemical
    Volume258
    DOIs
    Publication statusPublished - 2018 Apr 1

    Keywords

    • Adsorption
    • Humidity
    • Hydrogen
    • Platinum
    • Scattering
    • Sensor

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Instrumentation
    • Condensed Matter Physics
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Electrical and Electronic Engineering
    • Materials Chemistry

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