Using oxidation to increase the electrical conductivity of carbon nanotube electrodes

Hosea Tantang, Jie Yi Ong, Chen Lung Loh, Xiaochen Dong, Peng Chen, Yuan Chen, Xiao Hu, Lay Poh Tan, Lain Jong Li*

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

110 Scopus citations


Recent studies have demonstrated that significantly low sheet resistance (Rs) (<100 Ω/sq; comparable to ITO) were achieved in single-walled carbon nanotube (SWCNT) films treated with HNO3 followed by thionyl chloride. Here we show that H2SO4 can effectively reduce the Rs of SWCNT electrodes. H2SO4 treatment generates defects (COOH and SO3H functionalities) on SWCNTs and the produced chemical functionalities are beneficial for enhancing the electrical conductivity in SWCNT electrodes. It is plausible that the H2SO4 p-dopes the SWCNTs and the attachment of chemical functionalities helps to stabilize p-doping owing to their electron-deficient property.

Original languageEnglish (US)
Pages (from-to)1867-1870
Number of pages4
Issue number7
StatePublished - Jun 2009
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science


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