Enhanced hydrogen sensing employing electrodeposited palladium nanowires enclosed in anodized aluminum oxide nanopores

Palladium nanowire sensors have been limited to detecting small concentrations of molecular hydrogen (H 2 ). Upon excessive hydrogen uptake, tunneling currents fuse the nanowires creating a short circuit causing permanent failure. Here we demonstrate that electrodeposited palladium nanowires enclose...

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Bibliographic Details
Main Authors: Kocanda, M., Potluri, L., Haji-Sheikh, M., Ballantine, D.S., Bose, A.
Format: Conference Proceeding
Language:English
Subjects:
Aluminum oxide
Chemical sensors
Electrodes
Electrons
Etching
Fuses
Hydrogen
Nanoporous materials
Nanowires
Palladium
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Summary:Palladium nanowire sensors have been limited to detecting small concentrations of molecular hydrogen (H 2 ). Upon excessive hydrogen uptake, tunneling currents fuse the nanowires creating a short circuit causing permanent failure. Here we demonstrate that electrodeposited palladium nanowires enclosed within single-step anodized aluminum oxide nanopores reliably detect hydrogen concentrations greater than four percent and do not suffer the mechanical and electrical failures of conventional self-supporting nanowires. Multiple cycling of molecular hydrogen at 100% concentration and long-term exposure to high concentration of hydrogen does not contribute to permanent short-circuit failure of the sensor.
ISSN:1930-0395
2168-9229
DOI:10.1109/ICSENS.2009.5398155