Abstract
Compact, dendritic and featherlike growth morphologies, growth kinetics and electrical conductivity of aggregates obtained during electropolymerization in surfactant added systems (A) pyrrole–dodecyl benzene sulfonic acid (DBSA)–H2O (B) pyrrole–DBSA–sodium dodecyl sulfate (NaDS)–H2O and (C) pyrrole–DBSA–cetyl trimethyl ammonium bromide (CTAB)–H2O were investigated using vertical anode and circular cathode. Effect of time, field intensity, [DBSA], [NaDS] and [pyrrole] were studied for systems A, B, and C. Different transitions are seen in all the systems at different conditions. It is observed that growth is highest in system B. Growth rate follows the sequence B>A>C. Growth kinetics was studied and electric potential oscillations were monitored as a function of time during electropolymerization in systems A–C at different experimental conditions. On addition of NaDS and CTAB, particle size was increased and decreased respectively. Growth rate was found to be increased in system B due to the increase in the anodic charge of the film, leading to the better protonation of polypyrrole and decreased in system C due to coordination of CTAB with the growing polypyrrole chain. The formation of polypyrrole aggregates has been explained on the basis of diffusion limited aggregation (DLA) model. Fractal dimension of a pattern was found to be 1.69, in agreement with DLA model. Electropolymerized aggregates were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric studies (TGs), powder X-ray diffraction (XRD) and electrical conductivity measurements. Nanosized polypyrrole was formed in the range 50–100nm as evident by SEM and TEM studies. During electropolymerization, oscillations in potential were monitored as a function of time at different experimental conditions. Nature of oscillations was periodic.
Published Version
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