Optical readout of hydrogen storage in films of Au and Pd
For hydrogen sensor and storage applications, films of Au and Pd were (i) co-sputtered at different rates or (ii) deposited in a sequentially alternating fashion to create a layered structure on a cover glass. Peculiarities of hydrogen uptake and release were optically monitored using 1.3 μm wavelen...
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Veröffentlicht in: | Optics express 2017-10, Vol.25 (20), p.24081-24092 |
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creator | Nishijima, Yoshiaki Shimizu, Shogo Kurihara, Keisuke Hashimoto, Yoshikazu Takahashi, Hajime Balčytis, Armandas Seniutinas, Gediminas Okazaki, Shinji Juodkazytė, Jurga Iwasa, Takeshi Taketsugu, Tetsuya Tominaga, Yoriko Juodkazis, Saulius |
description | For hydrogen sensor and storage applications, films of Au and Pd were (i) co-sputtered at different rates or (ii) deposited in a sequentially alternating fashion to create a layered structure on a cover glass. Peculiarities of hydrogen uptake and release were optically monitored using 1.3 μm 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. Compositional 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 Auricher films. Three main parameters relevant for sensors: sensitivity, selectivity, stability (reproducibility) are discussed together with the hydrogenation mechanism in Au:Pd alloys. |
doi_str_mv | 10.1364/OE.25.024081 |
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title | Optical readout of hydrogen storage in films of Au and Pd |
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