In Situ Conductance Studies of Two-Component C60-Pd Polymer

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• 作者：Emilia Gr膮dzka ; Monika Wysocka-呕o艂opa ; Krzysztof Winkler
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 3, 2014
• 年：2014
• 卷：118
• 期：26
• 页码：14061-14072
• 全文大小：659K
• ISSN：1932-7455

文摘

Under well-controlled electrochemical conditions, C₆₀-Pd polymer was deposited at the electrode surface in tetra-n-butylammonium acetonitrile/toluene solution. The electrochemical properties and conductivity of this material were studied in acetonitrile containing different tetraalkylammonium perchlorates as supporting electrolytes. The film exhibits n-doped properties. The electrochemical quartz crystal microbalance results reveal that the polymeric film is doped with cations of the supporting electrolyte during switching between the neutral and reduced states. Such a transition also results in a sharp increase of the film conductivity. The C₆₀-Pd doping level and, therefore, charge carrier density depend on the size of the counterions incorporated into the polymeric structure during its reduction. The conductivity of the C₆₀-Pd polymeric film also depends on the size of the doping cation. The negatively charged mobile carriers generated during the film reduction are responsible for the film conductivity. The charge propagation through the polymeric film can be quantitatively described by the electron-hopping model. The specific conductivity of C₆₀-Pd and the electron diffusion coefficient are of the same order of magnitude as the values reported for typical p-doped conducting polymers. The conductivity properties of the composite of C₆₀-Pd polymer and palladium nanoparticles were also investigated. Metallic nanoparticles participate in charge transport within the film in the potential range of the polymer neutral state. Therefore, the C₆₀-Pd/Pd composite exhibits a large potential window of the conductivity state. The conductivity components related to the palladium nanoparticle involved in the charge transfer process and the electron hopping between differently charged fullerene centers were separated and determined.