Journal
NANOTECHNOLOGY
Volume 20, Issue 47, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/47/475703
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Funding
- BK21 Project of Changsung Corporation
- Seoul Fellowship
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There is some controversy regarding the effects of HNO3 on films of single- walled carbon nanotubes (SWCNTs). In this study we examined the change in sheet resistance of an HNO3-modified SWCNT film after different drying times at 85 degrees 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 original peak in the C 1s XPS spectra provided evidence for p-type doping. A decrease in sheet resistance was also observed in the SWCNTs films due to the removal of residual N-methylpyrrolidone solvent on the surface and bundle of SWCNTs. These results suggest that p-type doping has a larger effect on the sheet resistance than the removal of residual N-methylpyrrolidone by an HNO3 treatment. S Supplementary data are available from stacks.iop.org/Nano/20/475703
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