Measuring and testing – Gas analysis
Reexamination Certificate
2007-09-27
2010-10-26
Caputo, Lisa M (Department: 2855)
Measuring and testing
Gas analysis
C977S748000, C977S957000
Reexamination Certificate
active
07818993
ABSTRACT:
Single-walled carbon nanotubes (SWNTs) are decorated with metal nanoparticles to form high-performance flexible hydrogen sensors. The special process to form the high-performance flexible hydrogen sensors can combine a dry transfer printing technique and modification of SWNTs with palladium (Pd) nanoparticles to provide high-performance hydrogen sensors with excellent mechanical flexibility on plastic substrates. Two approaches can be used to decorate the SWNTs. One is physical deposition, such as electron beam evaporation (EBE) and the other is electrochemical deposition which can selectively grow palladium nanoparticles on the surface of the SWNTs, resulting in significantly decreasing the use of palladium. Preferably, the Pd nanoparticles are deposed on the SWNTs in a discontinuous arrangement so that the Pd nanoparticles are spaced away from each other to form individual discontinuous Pd nanoparticles rather a continuous Pd film. Advantageously, the SWNTs are arranged with substantial semiconducting pathways. Desirably, the high-performance flexible hydrogen sensors have an excellent response and recovery time, provide superior sensitivity for detecting hydrogen, and are bendable to conform to the contours of other structures.
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Publication: Yugang Sun, et al., “Electrodeposition of Pd Nanoparticles on Single-Walled Carbon Nanotubes for Flexible Hydrogen Sensors”, Applied Physics Letters 90, American Institute of Physics, Illinois, 2007.
Publication: Yugan Sun, et al., “High-Performance, Flexible Hydrogen Sensors That Use Carbon Nanotubes Decorated with Palladium Nanopartiles”, Advanced Materials, 2007, pp. 1-7.
Sun Yugang
Wang Hsien-Hau
Caputo Lisa M
Roy Punam
Tolpin Thomas W.
Tolpin & Partners, PC
UChicago Argonne LLC
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