Département de chimie moléculaire

Pt nanoparticles were successfully electrodeposited in situ on an org. conductive polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), using for the 1st time sinusoidal voltages of various frequencies in a chloroplatinic acid soln. The org. PEDOT matrix was electrodeposited on Pt electrode chips. The Pt electrode chips consist of a 150. nm Pt layer deposited on 100-oriented std. 3'' Si wafers. The cyclic voltammograms of the PEDOT-Pt-nanoparticles composite material recorded in 0.5 M H2SO4 aq. soln. demonstrated that Pt nanoparticles are electrochem. active. Values of the roughness of the composite materials, measured by optical noncontact 3-dimensional profilometry, ranging from 880 nm to 1.6 $μ$m were obtained depending on the time of deposition of the nanoparticles. The PEDOT-Pt-nanoparticles composite deposited by a sinusoidal voltage with a frequency range of 0.1 Hz-100 kHz, 50 frequencies, has a large specific electrochem. surface area compared with other composite coatings prepd. in this work and those previously reported. Atomic force microscopic (AFM) images revealed numerous deposited Pt nanoparticles on the org. PEDOT polymer film. [on SciFinder(R)]