Hydrogen sensor (400 ppm - 1%) based on 20% ScAlN pyroelectric detector for a sustainable society

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Hydrogen sensor (400 ppm - 1%) based on 20% ScAlN pyroelectric detector for a sustainable society
Title:
Hydrogen sensor (400 ppm - 1%) based on 20% ScAlN pyroelectric detector for a sustainable society
Journal Title:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII
Publication Date:
11 March 2024
Citation:
Ng, D. K. T., Chen, W., Wang, H., Gu, Z., Md Husni, M. H. K., Koh, I. J. W. Y., Xu, L., Wee, K. P. X., Ho, C. P., Goh, J. S., & Zhang, Q. (2024). Hydrogen sensor (400 ppm - 1%) based on 20% ScAlN pyroelectric detector for a sustainable society. In L. P. Sadwick & T. Yang (Eds.), Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII. SPIE. https://doi.org/10.1117/12.3021874
Abstract:
We develop H2 gas sensors based on CMOS compatible 20% ScAlN-based pyroelectric detectors fabricated in-house. Leveraging on the high thermal conductivity of H2, ScAlN-based pyroelectric detector is used in the H2 sensor for H2 to conduct away thermal energy received by the detector, resulting in a drop in signal received by the detector, thereby leading to different voltage signals measured for different H2 gas concentrations. The higher the H2 gas concentration, the lower the voltage measured as more thermal energy is conducted away from the detector. We successfully demonstrate H2 gas sensing with the signal received by the pyroelectric detector at concentration ranging from 400 ppm to 1% H2 concentration. The gases are cycled at 2-minute intervals between different concentrations of H2, using N2 as the reference gas. Our measurements show H2 sensing down to 400 ppm gas concentration with response time ranging from ~3-7 s. In addition, a linear relationship is also observed between the measured output signal from the H2 gas sensor and the H2 gas concentration flowing across the pyroelectric detector. The results show promise in using CMOS compatible 20% ScAlN-based pyroelectric detectors for development of thermal conductivity H2 gas sensor in H2 leakage sensing to increase confidence towards adoption of H2 as a clean energy as we move towards a sustainable society.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation / A*STAR - Low-Carbon Energy Research (LCER) Funding Initiative (FI)
Grant Reference no. : U2102d2012
Description:
Copyright 2024 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
ISBN:
10.1117/12.3021874
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