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Nanotubes respond to gas attacks Physicists in the US and Sweden have shown that the electrical resistance of a carbon nanotube changes when it is hit by an atom or molecule. The new results will need to be taken into account in devices that rely on nanotubes as chemical sensors (H E Romero et al. 2005 Science 307 89). Carbon nanotubes are rolled up sheets of graphite that display novel electronic properties as a result of their one-dimensional structure.
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