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Raman and Electrochemical Impedance Studies of Sol–Gel Titanium Oxide and Single Walled Carbon Nanotubes Composite Films

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Titanium oxide grown by a sol–gel route on single-walled carbon nanotubes was studied by Raman and Electrochemical Impedance techniques and compared with mixtures obtained by mechanical grinding. In spite of the superior dispersion of single-walled carbon nanotubes bundles in sol–gel composites, the lost of the small-diameter carbon nanotubes in the oxidizing sol–gel bath was inferred from their Raman spectra and the lower capacitive current of the voltammograms in 0.1 M H2SO4. We proposed proton electrosorption as the main charge storage mechanism for sol–gel composites, favoured by the hydroxylation and n-type conductivity of the oxide, while electrodes based on mixtures were dominated by double-layer charging, developing some pseudocapacitance with potential cycling due to the reversible oxidation of carbon nanotubes. Comparsion with TiO2/Carbon Blacks composites shows the effective role of single-walled carbon nanotubes as templates to control the mesoporous nature of sol–gel composite electrodes.
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Keywords: CARBON BLACKS; ELECTROCHEMICAL PROPERTIES; RAMAN SPECTROSCOPY; SINGLE WALLED CARBON NANOTUBES; SOL-GEL

Document Type: Research Article

Publication date: 01 April 2007

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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