Relation between structure and ions mobility in polypyrrole electrosynthesized under high frequency ultrasound irradiation

A. Et Taouil (1) , F. Lallemand (1) , J.-Y. Hihn (1) , L. Hallez (1) , V. Moutarlier (1) , V. Blondeau-Patissier (2)

1 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213)
2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

High frequency ultrasound (500 kHz) was shown to have very interesting effects on PPy elaborated with various counter-ions: perchlorate (ClO(4)(-)), p-toluenesulfonate (TS(-)) and molybdate (MoO(4)(2-)). Changes in polymer growth for sonicated films were highlighted by Atomic Force Microscopy (AFM) while Scanning Electron Microscopy (SEM) showed thinner and more homogeneous surface structure for PPy elaborated under ultrasound. Mobility of ions within PPy films was studied by electrochemical techniques, sonicated PPy seems to have much denser and more compact structure than silent one's. Specific electrochemical behavior was evidenced for sonicated PPy/MoO(4)(2-) as well as unique ions reparation within the organic matrix, thanks to Glow Discharge Optical Emission Spectroscopy (GDOES). This technique was used in original manner to study presence and repartition of doping ions in the film. X-Ray Photoelectron Spectroscopy (XPS) analyses showed an increase in doping level for sonicated PPy but electrical conductivity measurements let appear a decrease in conductivity for PPy elaborated under sonication.

Mots clés: High frequency ultrasound; Polypyrrole; Surface characterization; Doping ions; Molybdate; XPS; GDOES

Domaines: Electronique; Chimie

A. Et Taouil, F. Lallemand, J.-Y. Hihn, L. Hallez, V. Moutarlier, et al.. Relation between structure and ions mobility in polypyrrole electrosynthesized under high frequency ultrasound irradiation. Electrochimica Acta, 2011, 58, pp.67-75. ⟨10.1016/j.electacta.2011.08.087⟩. ⟨hal-00678458⟩