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RESEARCH PRODUCT

Etude électrochimique de molécules aminées aliphatiques et hétéroaromatiques. Application aux microcapteurs de pH.

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The first part describes the state of the art (electrochemical synthesis, developed applications and electrochemical reaction mechanisms) of the molecules used in his work: pyrrole and ethylenediamine. A second part is dedicated to the evolution of pH measurement processes. Thus, after an explanation of the pH concept, a presentation of both conventional pH measurement technique and of recent pH measurements methods is given.Then, thin polymer films are deposited on platinum surfaces by anodic electropolymerization of pyrrole and ethylenediamine. Then, we tested different electrolyte composition to determine the influence of solvent, salt and monomer concentrations on the electro-oxidation of pyrrole and ethylenediamine solutions. After that, several spectroscopic (IR and XPS) and microscopic (AFM and SEM) techniques were used to characterize the modified surfaces.Finally, pH sensors were elaborated by “lift-off” process then modified by anodic electrooxidization of pyrrole and ethylenediamine. This method was proved to be a good alternative to standard pH probes since these sensors can be both miniaturized and used in the clinical field if biocompatible polymers are selected as active layers. The sensitivity, reversibility and stability of these pH sensors were estimated for pH values between 4.5 and 9.0.