A role of HNO₃on transparent conducting film with single-walled carbon nanotubes

Abstract

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.

Stable, efficient p-type doping of graphene by nitric acid

“…The peak at ~400 eV is already detected in the pre-annealed (undoped) sample, as in previous reports on other graphitic materials like graphite 31 or single-walled carbon nanotubes (SWCNTs). 32 The peak at ~406 eV, seen in HNO 3 treated graphite and SWCNTs, has to our knowledge not been previously reported for monolayer or few-layer graphene. 33 Upon annealing the peak intensity at ~406 eV lowers, while the C-N peak remains constant.…”

Single-walled carbon nanotube transparent conductive films fabricated by reductive dissolution and spray coating for organic photovoltaics

“…The performance of the aqueous SWNT film is in good agreement with that previously reported in the literature for spray-deposited aqueous dispersions, 10 while the organic SWNT is competitive with some of the best performing carbon nanotube films. [25][26][27][28][29] AFM, transmittance, and spot-to-spot Raman measurements show good uniformity and consistent results for each film. An AFM micrograph for an organic SWNT film, showing the topographical uniformity of the film, is given in Figure 2(b).…”

Flexible transparent conductive materials based on silver nanowire networks: a review

“…Another dependency should be considered for the high-transparency regime where deviation from bulk-like behaviour is observed and can be explained by percolation effects as revealed by the good fit between the dashed lines Reprinted with permission from [118]. (b) Optical transmittance (at 550 nm) versus sheet resistance for graphene [14][15][16][17][18][19], carbon nanotubes [11,[20][21][22][23][24][25][26], AgNWs [27][28][29][30][31][32][33] and ITO [9,11,13]. Solid lines exhibit iso-values of the figure of merit (see text for explanations).…”