Usefulness of aqueous micellar media for electrosynthesis of poly(N-phenylpyrrole). Characterization and optical properties

Abstract

Poly-N-phenyl-pyrrole [poly(N-PhPy)] was electrosynthesized by anodic oxidation of N-PhPy on Pt electrode in acid aqueous micellar medium (0.1 M sodium dodecyl sulfate (SDS) + 1.93 M HClO 4 in 84/16 water/butanol v/v), using cyclic voltammetry (CV), chronoamperometry and chronopotentiometry. Electroactive poly(N-PhPy) films were formed upon scanning the potential ( E) between 0.0 and 1.4 V/SCE, under controlled potential ( E = 0.9–1.3 V/SCE) or controlled current density ( J = 0.125–2.0 mA/cm 2). The poly-NPhPy films were characterized by CV, MALDI-TOF mass spectrometry, FT-IR and X-ray photoelectron spectra (XPS), and their morphology was studied by scanning electron microscopy (SEM). Their optical properties, including electronic absorption and fluorescence spectra, were also investigated. A multiple-step mechanism for the poly(N-PhPy) films formation in micellar medium, based on the MALDI-TOF, FT-IR and XPS results, was proposed.