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Isolated single wall carbon nanotubes (SWNTs) were prepared on bare quartz and SiO 2 /Si substrates using a chemical vapor deposition process in which xylene was used as the carbon source. Controlled doping of isolated SWNTs with nitrogen was achieved by mixing appropriate amounts of acetonitrile with xylene. As the nitrogen concentration in the feed was increased from 0 to 33at.%, the radial...
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