Measuring and testing – Gas analysis
Reexamination Certificate
2006-07-14
2008-05-06
Williams, Hezron (Department: 2856)
Measuring and testing
Gas analysis
C438S048000
Reexamination Certificate
active
07367215
ABSTRACT:
The present invention provides for variable-range hydrogen sensors and methods for making same. Such variable-range hydrogen sensors comprise a series of fabricated Pd—Ag (palladium-silver) nanowires—each wire of the series having a different Ag to Pd ratio—with nanobreakjunctions in them and wherein the nanowires have predefined dimensions and orientation. When the nanowires are exposed to H2, their lattice swells when the H2concentration reaches a threshold value (unique to that particular ratio of Pd to Ag). This causes the nanobreakjunctions to close leading to a 6-8 orders of magnitude decrease in the resistance along the length of the wire and providing a sensing mechanism for a range of hydrogen concentrations.
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EP Search Report for related application 03791939.6; mailed Sep. 13, 2007.
Monty Greg
Ng Kwok
Yang Mohshi
Fish & Richardson P.C.
Frank Rodney
Kordzik Kelly K.
Nano-Proprietary, Inc.
Williams Hezron
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