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January 12th, 2005
Researchers in the Physics Department at Oxford University have developed a novel technique that allows them to purify carbon nanotubes and to sort those that are semiconducting from the metallic single-walled carbon nanotubes.
The Oxford team has developed a new method for removing the magnetic impurities without significantly affecting the yield of nanotubes. They have also proposed a method for separating the metallic from the semiconducting nanotubes using the intrinsic magnetic properties of the nanotubes themselves. This latter technique can also be used to pick out semiconducting nanotubes of different diameters.
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