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Author Zeng, X. -Q. ♦ Wang, Y. -L. ♦ Deng, H. ♦ Latimer, M. L. ♦ Xu, T. ♦ Wang, H. -H. ♦ Welp, U. ♦ Crabtree, G. W. ♦ Kwok, W. -K.
Sponsorship USDOE Office of Science (SC) ♦ Northern Illinois Univ.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ADHESION ♦ DEPOSITION ♦ DETECTION ♦ FILTRATION ♦ HYDRIDES ♦ HYDROGEN ♦ INHIBITION ♦ LAYERS ♦ MEMBRANES ♦ PALLADIUM ♦ PERFORMANCE ♦ SENSITIVITY ♦ SENSORS ♦ SOLID SOLUTIONS ♦ SPUTTERING ♦ SURFACE AREA
Abstract The newly developed hydrogen sensor, based on a network of ultrasmall pure palladium nanowires sputter-deposited on a filtration membrane, takes advantage of single palladium nanowires' characteristics of high speed and sensitivity while eliminating their nanofabrication obstacles. However, this new type of sensor, like the single palladium nanowires, cannot distinguish hydrogen concentrations above 3%, thus limiting the potential applications of the sensor. This study reports hydrogen sensors based on a network of ultrasmall Cr-buffered Pd (Pd/Cr) nanowires on a filtration membrane. These sensors not only are able to outperform their pure Pd counterparts in speed and durability but also allow hydrogen detection at concentrations up to 100%. The new networks consist of a thin layer of palladium deposited on top of a Cr adhesion layer 1-3 nm thick. Although the Cr layer is insensitive to hydrogen, it enables the formation of a network of continuous Pd/Cr nanowires with thicknesses of the Pd layer as thin as 2 nm. The improved performance of the Pd/Cr sensors can be attributed to the increased surface area to volume ratio and to the confinement-induced suppression of the phase transition from Pd/H solid solution ({alpha}-phase) to Pd hydride ({beta}-phase).
ISSN 1936086X
Educational Use Research
Learning Resource Type Article
Publisher Date 2011-01-01
Publisher Place United States
Journal ACS Nano
Volume Number 5
Issue Number 9
Technical Publication No. ANL/MSD/JA-70457
Organization Argonne National Lab. (ANL), Argonne, IL (United States)


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