Etude de nanocomposites polypyrrole/nanoparticule de carbone par impédance électrochimique et Ac-électrogravimétrie : application aux capteurs électrochimiques

Abstract : The advent of nanotechnology is a major scientific revolution of the 21st-century, involving the manipulation and characterization of matter at the nanoscale to design new high performance nanocomposites. The application of nanotechnologies in different fields has made it possible to develop and propose promising, effective and often unexpected solutions. Particularly, in the field of sensors, nanotechnologies have open new fields of research allowing the development of miniaturized devices, inexpensive, highly efficient sensors. The objective of this work is to study new nanocomposites based on polypyrrole and nanoparticles of carbon as well as their applications as electrochemical sensors. Simple approaches have been used to combine the unique properties of different materials to obtain new high-performance nanocomposite electrodes, by combining, in particular, the unique properties of ionic liquids or bismuth films with polymer films. The electrochemical and electrogravimetric behavior of polypyrrole films and their nanocomposites has been studied by various electrochemical techniques including electrochemical impedance, cyclic electrogravimetry and ac-electrogravimetry. Ion transfers and electrochemical mechanisms at modified electrode/electrolyte interfaces have been reported, for the first time, using ac-electrogravimetric measurements, consisting in coupling simultaneously the gravimetric measurements of the quartz microbalance with those of the electrochemical impedance. The originality of this work consists in the elaboration and the characterization of electrodes modified with new nanocomposite films as well as their applications as electrochemical sensors for detection of traces of metallic ions in environmental and food samples.
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Larbi Oularbi. Etude de nanocomposites polypyrrole/nanoparticule de carbone par impédance électrochimique et Ac-électrogravimétrie : application aux capteurs électrochimiques. Matériaux. Sorbonne Université; Université Hassan II Casablanca, 2018. Français. ⟨tel-02305396⟩

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