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Using oxidation to increase the electrical conductivity of carbon nanotube electrodes

Authors:	Hosea Tantang Chen Lung Loh Peng Chen Xiao Hu Lain-Jong Li

Affiliation:	^a School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore ^b School of Chemical and Biomolecular Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore

Abstract:	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 H₂SO₄p-dopes the SWCNTs and the attachment of chemical functionalities helps to stabilize p-doping owing to their electron-deficient property.

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