Room-temperature optical detection of hydrogen gas using palladium nano-islands |
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| Authors: | Alain J. Corso Enrico Tessarolo Martino Guidolin Enrico Della Gaspera Alessandro Martucci Marco Angiola Alberto Donazzan Maria G. Pelizzo |
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| Affiliation: | 1. National Research Council of Italy, Institute for Photonics and Nanotechnologies, Via Trasea 7, 35131 Padova, Italy;2. Centre of Studies and Activities for Space, University of Padova, Via Venezia 15, 35131 Padova, Italy;3. RMIT University, School of Science, Melbourne, VIC, Australia;4. University of Padova, Department of Industrial Engineering, Via Marzolo 9, 35131 Padova, Italy;5. University of Padova, Department of Information Engineering, Via Gradenigo 6/B, 35131 Padova, Italy |
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| Abstract: | Palladium thin films of different thicknesses have been processed by oxidation and subsequent reduction in hydrogen atmosphere. Hydrogen optical sensing properties of as-deposited (Pd) and processed (r-Pd) samples have been experimentally tested with a H2 concentration of 5% and 1%, discovering that the reduced films show improved performances in term of response/recovery time. As reveled by SEM images, the oxidation/reduction process modifies the surface appearance, which assumes a nano-islands structured morphology. The porosity of the processed films may explain the reduction of the response/recovery time, while the larger effective sensing surface in thinner samples justifies the responsivity performances. |
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| Keywords: | Hydrogen detection Palladium Palladium oxide Optical sensor |
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