Abstract
Miniaturized high-performance hydrogen (H2) sensors often suffer from reliability issues in terms of baseline drift and surrounding air flow. Normally, the sensors are often realized on microheaters to facilitate the redox reaction (desorption of generated water molecules at high temperature) to avoid the baseline drift, which leads to structural instability. In this paper, we report an UV (λ -400 nm/P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</sub> -400 μW/P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</sub> -18 mW) excited ZnO nanosphere-based H2 sensor, which is almost independent of surrounding air flow with minimum base line drift. The ZnO nanospheres are synthesized by microwave-assisted technique and characterized at a different temperatures in the presence and absence of UV light to optimize the operating condition. It can be observed that the UV irradiated sensor is getting sufficient activation energy to enable the current modulation at different temperatures (60 °C and 100 °C), including room temperature (27 °C) in different concentrations of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (1% to 4%). By exploiting the UV radiation, flow independent (250-1000 sccm) with negligible baseline drift H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> sensor is demonstrated with fast response/recovery time at room temperature (27 °C). Theoretical reasoning for sensing characteristic is attempted to explain with the help of scanning electron microscopy, X-ray diffraction, ultraviolet-visible-near infrared, and photoluminescence spectrum. Flow dependence, repeatability, cross selectivity, and humidity tests were also conducted to study the reliable issues.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
