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Sub-ppb-level sensitive hydrogen gas sensing based on PDMS-Pt enhanced microrod cavity.

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    This study presents a novel optical sensor for highly sensitive hydrogen detection. The device utilizes a platinum-coated microrod resonator, achieving parts-per-billion sensitivity for clean energy safety.

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    Area of Science:

    • Materials Science
    • Chemical Engineering
    • Optoelectronics

    Background:

    • Hydrogen is a crucial clean energy source requiring sensitive and rapid detection for safety.
    • Conventional optical microcavities lack sensitivity to hydrogen due to its small molecular weight.
    • Surface-functionalized microcavities offer a promising solution for enhanced hydrogen sensing.

    Purpose of the Study:

    • To develop a highly sensitive and selective optical sensor for hydrogen detection.
    • To leverage whispering-gallery-mode (WGM) microcavities for improved hydrogen sensing performance.
    • To demonstrate a novel optical strategy for practical hydrogen sensing applications.

    Main Methods:

    • Fabrication of a high-quality-factor polydimethylsiloxane-platinum coated microrod resonator.
    • Utilizing platinum as a catalytic site for hydrogen oxidation.
    • Employing polydimethylsiloxane (PDMS) for microcavity protection and leveraging its thermo-optic properties for detection.

    Main Results:

    • Successful detection of hydrogen at concentrations as low as 0.16 parts per billion (ppb).
    • Achieved selective hydrogen detection with a wide dynamic range up to 100 parts per million (ppm).
    • Demonstrated real-time monitoring of transmission spectrum shifts for sensitive detection.

    Conclusions:

    • The developed sensor offers a novel and effective optical strategy for hydrogen detection.
    • The sensor exhibits high sensitivity, selectivity, and a broad dynamic range, suitable for practical applications.
    • This approach enhances the safety and efficiency of hydrogen production, transportation, and utilization.