04/21: Nanotubes in vacuum experience an increase in their response to light
Researchers at the University of California, Riverside (USA), have discovered that the electrical conductivity of single-walled carbon nanotubes varies much more in response to light when the nanotubes are in space. This effect could be useful for using carbon nanotubes as infrared sensors in infrared thermal imaging, spectroscopy and astronomy.
"We found that single-walled carbon nanotubes are not photoconductive in the usual sense of the word, in which light leads to an excited state that conducts electricity effectively due to the production of free carriers," said Robert Haddon of the University of California Riverside for nanotechweb.org. “Instead, we found that the excitation states produced by light decay extremely fast in single-walled carbon nanotube films, so that the effect produced by the light is a thermal heating of the film. It is the change in temperature of the nanotube film that leads to a change in its electrical resistance ”.
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