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arXiv · 1706.05517

Optical readout of hydrogen storage in films of Au and Pd

Yoshiaki Nishijima·Shogo Shimizu·Keisuke Kurihara·Yoshikazu Hashimoto·Hajime Takahashi·Armandas Balcytis·Gediminas Seniutinas·Shinji Okazaki·Jurga Juodkazyte·Takeshi Iwasa·Tetsuya Taketsugu·Yoriko Tominaga·Saulius Juodkazis
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Abstract

For hydrogen sensor and storage applications, films of Au and Pd were (i) co-sputtered at different rates or (ii) deposited in a sequential layer-by-layer fashion on a cover glass. Peculiarities of hydrogen uptake and release were optically monitored using 1.3 micrometers wavelength light. Increase of optical transmission was observed for hydrogenated Pd-rich films of 10-30 nm thickness. Up to a three times slower hydrogen release took place as compared with the hydrogen uptake. Composition ratio of Au:Pd and thermal treatment of films provided control over the optical extinction changes and hydrogen uptake/release time constants. Higher uptake and release rates were observed in the annealed Au:Pd films as compared to those deposited at room temperature and were faster for the Au-richer films. Three main parameters relevant for sensors: sensitivity, selectivity, stability (reproducibility) are discussed together with the hydrogenation mechanism in Au:Pd alloys.

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Yoshiaki Nishijima, Shogo Shimizu, Keisuke Kurihara, Yoshikazu Hashimoto, Hajime Takahashi, Armandas Balcytis, Gediminas Seniutinas, Shinji Okazaki, Jurga Juodkazyte, Takeshi Iwasa, Tetsuya Taketsugu, Yoriko Tominaga, Saulius Juodkazis. 2017-06-17. Optical readout of hydrogen storage in films of Au and Pd. https://doi.org/10.1364/oe.25.024081

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