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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 81: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
CPP 81.7: Vortrag
Mittwoch, 18. März 2020, 17:00–17:15, WIL A317
Hydrogen Sensing with Palladium-based Perfect Absorber under variable ambient pressures — •Ramon Walter1, Florian Stern1, Ediz Herkert1,2, Tobias Pohl1, and Harald Giessen1 — 1University of Stuttgart, Germany — 2ICFO - The Institute of Photonic Sciences, Castelldefels (Barcelona), Spain
The increasing C02-content makes it necessary to replace the fossil energy carrier by alternative climate-neutral energy sources. Hydrogen has the potential to be one of this new energy sources. However, this gas has a high potential risk when mixed with oxygen. A reliable and sensitive sensor is needed to reduce this risk and safe lives.
Previous works showed that palladium is an ideal material for such a sensor. Nanoparticles made out of palladium will change under hydrogen pressure their lattice constant and consequently their dielectric properties. This will have a measurable influence of their optical properties depending on the hydrogen content in the lattice.
In this work, we investigate the potential of such palladium based perfect absorber devices as hydrogen sensor under different variable ambient pressures, which is required for a number of technically relevant applications. We believe that this should extend the range of possible applications without increasing a potential risk, as the sensor works pure optical and is completely separated by any kind of evaluation electronics. Furthermore, means to shield the sensor from contamination with other gases and the consequences for our sensing geometry are discussed.