Nanoscale Surface Morphology and Monomer Concentration Dependence on Impedance of Electrocoated 2,2-Dimethyl-3,4-Propylene-dioxythiophene on Carbon Fiber Microelectrode
Abstract:Poly(2,2-Dimethyl-3,4-propylenedioxythiophene) (PProDOT-Me2) thin films have been cyclovoltametrically coated onto carbon fiber microelectrode (CFME) as an active functionalized microelectrode. An electrochemical impedance spectroscopic study on the prepared electrodes is reported in this paper which electropolymerization performed under different initial monomer concentrations. The electrochemical impedance data fitted to equivalent circuit model, used to find out numerical values of the proposed components. Effect of the parameters on the capacitive behavior of the (PProDOT-Me2) coated carbon fiber microelectrode and morphology of films obtained by AFM and SEM was discussed. Highly porous coating was obtained at 100 mV/s scan rate and 10 cycles. EDX and ATR-FTIR results indicated the doping of anion of electrolyte due to formation of polaronic and bipolaronic sites. The presence of surface functional groups were determined by ATR-FTIR. Nanoscale conjugated polymer modified carbon fiber microelectrodes exhibited high capacitance of ∼90 phase angle, and vertical line in Nyquist plot. The capacitive behavior of CFME was increased by this very thin film coating of PProDOT-Me2. The electroactivity of Poly 2,2-Dimethyl-3,4-propylenedioxythiophene on the carbon fiber microelectrode open the possibility of using these coated electrodes for electrochemical microsupercapacitors and biosensor electrodes.
Keywords: ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; ELECTROCHEMICAL MODIFICATION OF CARBON FIBER SURFACE; EQUIVALENT CIRCUIT; MICRO-SUPERCAPACITOR; NANOSCALE CARBON FIBER SURFACE CHARACTERIZATION; NANOSCALE ELECTROCOATING; POLY(2,2-DIMETHYL-3,4-PROPYLENEDIOXYTHIOPHENE)
Document Type: Research Article
Publication date: October 1, 2007
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