Formation of metal nanowires for use as variable-range hydrogen sensors
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United States of America Patent
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May 6, 2008
Grant Date -
Apr 3, 2008
app pub date -
Jul 14, 2006
filing date -
Aug 30, 2002
priority date (Note) -
Expired
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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 H.sub.2, their lattice swells when the H.sub.2 concentration 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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