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Nanotechnology. 2009 Nov 25;20(47):475703. doi: 10.1088/0957-4484/20/47/475703. Epub 2009 Oct 26.

A role of HNO3 on transparent conducting film with single-walled carbon nanotubes.

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SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon 440746, Republic of Korea.


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.

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