Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 24: Functional Materials II

MM 24.3: Vortrag

Dienstag, 27. März 2012, 12:00–12:15, H 1029

Systematic Study of the Hydrogen-Sensing Performance of Buffered and Capped Pd and PdNi Layers for Plasmonic Applications — •Nikolai Strohfeldt, Andreas Tittl, and Harald Giessen — 4th Physics Institute and Research Center SCOPE, University of Stuttgart, D-70569 Stuttgart, Germany

We present a systematic experimental study of the hydrogen-sensing performance of buffered and capped Pd and PdNi layers. We focus specifically on the aging behavior of the thin films and compare the magnitude of the sensor response as well as the response time for freshly evaporated and 4 and 11 day old samples.

We find an optimized sample geometry consisting of a PdNi layer capped with 3 nm Pt and buffered with 10 nm of CaF₂ that exhibits excellent signal stability and linear signal response in the concentration range from 0.5% to 5% hydrogen in nitrogen.

The samples were measured in a custom-designed sensor head consisting of a light emitting diode and two photo-diodes that allow us to simultaneously track the reflected and transmitted light from our samples.

The observed insights can be easily incorporated into plasmonic geometries to improve concepts like antenna enhanced or perfect absorber based hydrogen sensing and allow us to move one step closer to a durable and industrially feasible optical plasmonic hydrogen sensor.