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Excellent sensors for molecular hydrogen,to be used, e.g., for leakage control in H2-based energy sources, are fabricated by functionalization of single-walled carbon nanotubes (SWNTs) with a non-continuous coating of palladium. These sensors, with large electrical conductivity modulation in the presence of small H2 concentrations in air, show fast response and high sensitivity even at room temperature. The Figure presents an AFM image of a Pd-coated SWNT.
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Kong et al. (2001) studied this question.
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