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A thermoelectric `nano-nose' has been built from tangled bundles of single-walled carbon nanotubes (SWNT). The response is specific to the details of the interaction of the adsorbed molecule with the nanotube wall; even gases such as He, N 2 and H 2 can be easily detected. Plots of ΔSvs.ρ a are sensitive to whether oxidation or reduction of the tube wall is taking place, and...
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