화학공학소재연구정보센터
Journal of Materials Science, Vol.53, No.5, 3876-3888, 2018
Structural, morphological and electrochemical properties of a polypyrrole nanohybrid produced by template-assisted fabrication
Polypyrrole nanofibers/meso-tetra(4-sulfonatophenyl)porphyrin/graphene quantum dots nanohybrid (PTG) was synthesized by a facile chemical oxidative reaction using persulfate salt of cetyltrimethylammonium cation ((CTA)(2)S2O8) as the oxidative template. The facile formation and interactions among different constituents were established by FT-IR, UV-Vis, XRD and XPS studies. Morphological analysis was carried out by SEM and HRTEM showing polypyrrole nanofibers (PNF) to be formed with diameters in the range of 29-57 nm and HRTEM micrographs depicted the intercalation of meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) and graphene quantum dots (GQDs) with PNF. The electrical conductivity of PNF and PTG was evaluated using four-probe conductivity measurement. Electrochemical activity of PNF and PTG deposited on indium tin oxide (ITO) electrode was demonstrated using cyclic voltammetry with Fe(CN) (6) (4-/3-) as the redox species. PTG electrode displayed an enhanced voltammetric response vis-A -vis PNF due to the synergistic effect of PNF, TSPP and GQDs resulting in an increased electroactive area beneficial for a sensing probe. Further, the PTG electrode was checked for its capability to simultaneously detect Cd2+ and Pb2+ in aqueous solution by differential pulse voltammetry (DPV).