Nanoscale surface morphology and monomer concentration dependence on impedance of electrocoated 2,2-dimethyl-3,4-propylenedioxythiophene on carbon fiber microelectrode

Sarac A. S. , Gencturk A., Schulz B., Gilsing H., Serantoni M.

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, vol.7, no.10, pp.3543-3552, 2007 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 10
  • Publication Date: 2007
  • Doi Number: 10.1166/jnn.2007.848
  • Page Numbers: pp.3543-3552


Poly(2,2-Dimethyl-3,4-propylenedioxythiophene) (PProDOT-Me-2) thin films have been cyclovoltametrically coated onto carbon fiber microelectrocle (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-Me-2) 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. EIDX 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 similar to 90 degrees phase angle, and vertical line in Nyquist plot. The capacitive behavior of CFME was increased by this very thin film coating of PProDOT-Me-2. The electroactivity of Poly 2,2-Dimethyl-3,4-propylenedioxythiophene on the carbon fiber microelectrocle open the possibility of using these coated electrodes for electrochemical microsupercapacitors and biosensor electrodes.