NDLI: Hydrogen sensing with Pd-coated long-range surface plasmon membrane waveguides

Content Provider	Royal Society of Chemistry (RSC)
Author	Fong, Norman R. Tait, R. N. Berini, Pierre
Copyright Year	2016
Abstract	A low power, reusable optical hydrogen sensor using long-range surface plasmon polariton (LRSPP) cladded membrane waveguides is demonstrated. The sensor incorporates a 5 μm wide, 20 nm thick gold stripe embedded in a 160 nm thick free-standing Cytop membrane with a 5 nm thick Pd over-layer. Input and output coupling is achieved with directly integrated broadside grating couplers. The sensor is tested with hydrogen concentrations up to 3% and demonstrates a strong response with an estimated detection limit of 290 ppm, and a response time of 7 s to a 0.6% H2 step – this level of performance is among the best reported for optical H2 sensors. Cycling of the hydrogen exposure shows a significant hysteresis response, however no film deformation or delamination was observed over many cycles. The high stress that is induced in clamped films during hydrogenation is relaxed in due to the film being deposited on the flexible and elastic Cytop membrane. This could result in improved lifetimes for this sensor and increased uptake ability.
Starting Page	4284
Ending Page	4290
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	8
Issue Number	7
Journal	Nanoscale
DOI	10.1039/c5nr08001k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Broadside Hydrogen Micrometre Hydrogen sensor Surface plasmon Polariton Hydrogenation Hysteresis
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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