Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 21: Poster Monday: Plasmonics and Nanooptics

O 21.8: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

Magensium Nickel Alloy Thin Films for Electrochemical Switching — •Elinor Kath, Florian Sterl, Mario Hentschel, and Harald Giessen — 4. Physikalisches Institut, Universität Stuttgart

Hydrogen can be reversibly loaded in and unloaded from magnesium, which is why magnesium gained significant attention as a potential low-risk storage medium for Hydrogen. Concurrently, magnesium also has found applications in switchable and active plasmonics. While elementary magnesium is metallic, magnesium hydride (MgH₂) is a transparent dielectric which allows switching on and off the plasmonic resonances in individual nanoparticles. For many potential applications the loading and unloading times are impractically long. To increase this switching rate we introduce small amounts of nickel into magnesium films. We are able to fabricate magnesium-nickel alloy thin films with different and controllable nickel concentrations. In our experiments these films are switched gasochromically, that is, using a hydrogen-nitrogen atmosphere, to determine the ideal amount of nickel for the best switching properties. Our measurements show that the loading and unloading times can be significantly reduced in the alloyed systems. Future directions include the potential to switch the magnesium-nickel alloy films electrochemically by immersing them into a KOH electrolyte and applying a negative voltage to the magnesium.