4.3 Article

Doping and de-doping of carbon nanotube transparent conducting films by dispersant and chemical treatment

Journal

JOURNAL OF MATERIALS CHEMISTRY
Volume 18, Issue 11, Pages 1261-1266

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/b717387c

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Single-walled carbon nanotubes (SWCNTs) dispersed with Nafion in a solvent mixture containing de-ionized water and 1-propanol (bisolvent) were sprayed on a poly(ethylene terephthalate) substrate to fabricate flexible transparent conducting films (TCFs). Different SWCNT-to-Nafion ratios were used to optimize the film performance of transparence and sheet resistance. The TCFs were then immersed in nitric acid. These steps resulted in p-type doping due to the presence of Nafion in the SWCNT network and de-doping (removal of doping effect) by the acid treatment. X-Ray photoelectron and Raman spectroscopy confirmed that the de-doping effect occurred with the partial removal of Nafion from the nanotube surface by the nitric acid treatment, which improved the film conductivity by a factor of similar to 4 with negligible change in transmittance.

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