Web Release Date: February 6,
Comparative Study on Different Carbon Nanotube Materials in Terms of Transparent Conductive Coatings
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Nanotechnology Center and Applied Science Department, University of Arkansas at Little Rock, Little Rock, Arkansas 72204, Department of Physics and Astronomy, University of Arkansas at Little Rock, Little Rock, Arkansas 72204, National Institute for Research and Development of Isotopic and Molecular Technologies, P.O. Box 700, R-400293 Cluj-Napoca, Romania, and Physics Department, University of Arkansas, Fayetteville, Arkansas 72701
Received June 24, 2007
In Final Form: December 3, 2007
Abstract:
We compared conductive transparent carbon nanotube coatings on glass substrates made of differently produced single-wall (SWNT), double-wall, and multiwall carbon nanotubes. The airbrushing approach and the vacuum filtration method were utilized for the fabrication of carbon nanotube films. The optoelectronic performance of the carbon nanotube film was found to strongly depend on many effects including the ratio of metallic-to-semiconducting tubes, dispersion, length, diameter, chirality, wall number, structural defects, and the properties of substrates. The electronic transportability and optical properties of the SWNT network can be significantly altered by chemical doping with thionyl chloride. Hall effect measurements revealed that all of these thin carbon nanotube films are of p-type probably due to the acid reflux-based purification and atmospheric impurities. The competition between variable-range hoping and fluctuation-assisted tunneling in the functionized carbon nanotube system could lead to a crossover behavior in the temperature dependence of the network resistance.
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