Abstract
There is some controversy regarding the effects ofHNO3 on filmsof single-walled carbon nanotubes (SWCNTs). In this study we examined the change in sheet resistanceof an HNO3-modified SWCNT film after different drying times at85 °C using various analytical techniques. The shift and suppression in the Raman spectra,bleaching of the transition peaks related to van Hove singularities and a shift in the originalpeak in the C 1s XPS spectra provided evidence for p-type doping. A decrease in sheetresistance was also observed in the SWCNTs films due to the removal of residualN-methylpyrrolidone solvent on the surface and bundle of SWCNTs. These results suggestthat p-type doping has a larger effect on the sheet resistance than the removal of residualN-methylpyrrolidoneby an HNO3 treatment.
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