Stephen R. Cariño, Ishmael S. Ordoñez, and Florentino C. Sumera
Institute of Chemistry
University of the Philippines
doi.org/10.57043/transnastphl.1997.5915
Abstract
Photoelectrochemistry of polyaniline (PAni), a conducting polymer deposited on an indium-doped tin oxide (ITO)-coated glass substrate, was studied in aqueous medium consisting of 2mM Fe(CN)63−/4− in 1M KCl. On illumination of the polymer-modified electrode and application of negative potential, cathodic photocurrent densities greater than 20nA/cm2were detected. Doping of the conducting polymer with a dye, copper phthalocyanine tetrasulfonate (CuPcTS) doubled the photoelectrochemical response to about 40nA/cm2. The polymer was prepared by electropolymerization of aniline in 0.1M H2 SO4 via repeated cycling between 0.0 to 0.7v vs. Ag/AgCl. Copper phthalocyanine tetrasulfonate (Na salt) was incorporated by polymerizing the aniline monomer in the presence of the dye. The conducting polymer-dye composite was characterized by IR, UV-Vis, scanning electron microscopy and cyclic voltammetry.