Conductive, Capacitive, and Viscoelastic Properties of a New Composite of the C60−Pd Conducting Polymer and Single-Wall Carbon Nanotubes

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• 作者：Piotr Pieta ; Emilia Grodzka ; Krzysztof Winkler ; Magdalena Warczak ; Andrzej Sadkowski ; Grazyna Z. Zukowska ; Ganesh M. Venukadasula ; Francis D’ ; Souza ; Wlodzimierz Kutner
• 刊名：Journal of Physical Chemistry B
• 出版年：2009
• 出版时间：May 14, 2009
• 年：2009
• 卷：113
• 期：19
• 页码：6682-6691
• 全文大小：457K
• 年卷期：v.113,no.19(May 14, 2009)
• ISSN：1520-5207

文摘

Thin films of a new composite of an electroactive fullerene-based (C₆₀−Pd) polymer and HiPCO single-wall carbon nanotubes, which were noncovalently modified by 1-pyrenebutiric acid (pyr-SWCNTs), were electrochemically prepared under multiscan cyclic voltammetry conditions. With respect to blank polymer, superior conductive, capacitive, and viscoelasitic properties of the composite were demonstrated. Composition of pyr-SWCNTs was determined by thermogravimetric analyses, which showed one molecule of 1-pyrenebutiric acid per 20 carbon atoms of SWCNT. Atomic force microscopy imaging revealed that pyr-SWCNTs form tangles of pyr-SWCNTs bundles surrounded by globular clusters of the C₆₀−Pd polymer. Peaks characteristic of both pyr-SWCNTs (radial breathing modes at 200 to 300 cm⁻¹) and C₆₀−Pd polymer in the Raman spectra recorded for the composite confirmed the presence of pyr-SWCNTs in the composite film. The mass of the deposited film was in situ measured by piezoelectric microgravimetry with the use of an electrochemical quartz crystal microbalance (EQCM). Then, curves of the current, resonant frequency change, and dynamic resistance change versus the potential in different potential ranges were simultaneously recorded in a blank acetonitrile solution of tetrabutylammonium perchlorate. Specific capacitance, determined at −1.20 V for the composite as 90 F g⁻¹, was twice as high as that for the polymer. Electrochemical impedance spectroscopy was used to determine impedance parameters of both the C₆₀−Pd polymer and C₆₀−Pd/pyr-SWCNTs composite film. This data analysis indicated increased capacitance and decreased resistance for the new composite film.