META 2021, META'12

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Systematic Study of the Hydrogen-Sensing Performance of Buffered and Capped Pd and PdNi Layers for Plasmonic Applications
Nikolai Strohfeldt, Andreas Tittl, Harald Giessen

Last modified: 2012-01-06

Abstract


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 3% hydrogen in nitrogen.

Keywords


plasmonics; palladium; hydrogen