Poly(3,4-alkylenedioxythiophene) Nanostructures
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1240-WW06-08
Poly( 3,4-alkylenedioxythiophene) Nanostructures
A.Sezai Sarac Istanbul Technical University,Department of Chemistry Polymer Science & Technology ,Maslak 34469 Istanbul ,Turkey
ABSTRACT Electropolymerization of unsubstituted and substituted propylene - dioxythiophenes (i.e., ProDOT & ProDOT-Bz) on ( ~7 µm diameter) single carbon fiber microelectrodes (SCFMEs) in different electrolytes resulted the network of nanopore structures. Surface morphology of coatings were investigated by Scanning Electron Microscopy (SEM), the attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) was used for the characterization . Electrochemical impedance spectroscopic investigation of these nanostructures has been indicated the capacitive behavior of electrode system. Data were used to simulate at applied potential and explained by equivalent circuit modeling. INTRODUCTION Supercapacitors1are unique devices exhibiting greater capacitance than conventional capacitors, due to combination of the double-layer capacitance and pseudocapacitance associated with the participation of adsorbed intermediates in the surface. Depending on the redox-type , they can show high cycle life and stability, with useful electronic applications. Capacitor behavior of Carbon Fiber Microelectrode (CFME) can be significantly enhanced by the formation of carbon/conducting polymers as nano and microcomposites by electropolymerization of Propylenedioxythiophenes, such system can represent a very welldefined region of pseudocapacitance properties because of the Faradaic redox reactions of their rich surface functionality.Higher energy densities can be achieved due to charging occuring through the small volume of material. Electrochemical coating of electroactive polymeric nanostructures on carbon substrates as nanoporous structure can increase the surface area. Nanostructured Poly( 3,4alkylenedioxythiophene ),i.e., Propylenedioxythiophenes, have exhibited high surface area and faster diffusion rates of ions into the nanostructures,which can be used in the Electrochemical capacitor( supercapacitor) applications. Experimental conditions play important role on the final properties of modified CFMEs2,3. Electrochemical oxidation and reduction of electrogenerated or chemically formed, redox active
films of conducting polymers4 ,5can introduce positive or negative charge centers on electronically conjugated polymer chains results a supercapacitor behavior6,7 ,8. The efficiency of the electropolymerization on carbon fiber surfaces under cyclovoltammetric conditions can be evaluated, i.e., scan rate, scan number, yield and morphology9.Substituted Poly( propylenedioxythiophene) thin films have been cyclovoltametrically coated onto carbon fiber electrode to obtain an active functionalized microelectrode10.11.In this presentation electroactive nanostructured Poly( propylenedioxythiophene) formations onto carbon fiber are reported . Evaluations of capacitor performance by electrochemical impedance spectroscopy (EIS) and characterization
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