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Nouveaux développements en microscopie électrochimique (SECM) pour l'analyse de surfaces fonctionnalisées

Abstract : This manuscript describes the work done for the development and use of electrochemical microscope (SECM) for the investigations of functional surfaces. This local probe microscopy, using the properties of ultramicroelectrodes (UMEs), permits the analysis of chemical reactivity on the sample’s surface. The aim of this work is then analyzing surfaces functionalized with an organic layer. Initially, we have developed the SECM methodology by using specific redox probes. First, it allowed us to determine the absolute distance between the electrode and the surface, thanks to an irreversible redox mediator such as polyaromatic. Then, we could observe the physicochemical surface properties, in particular to differentiate the electronic transfer modes through an organic layer, by using catechols or redox dendrimers. We have also started the development of a new mode of SECM: transient SECM. Secondly, we used the SECM to analyze three functionalized surfaces. The first surface is a gold substrate functionalized by calixarenes. The second is a glass side on which it was deposed photosensitive nanoparticles, called "quantum rods" and the last sample is a substrate of silicon modified by anthracene receptors. Finally, the last study concerns the writing and reading on an organic monolayer with the SECM probe. These localized changes of the organic layer are about the size of the UME, of the order of a micrometer. In our case, we chose the modification of self-assembled organic monolayer (SAM) on a gold substrate by the Huisgen coupling reaction. In addition to the improvement of our conditions of functionalization, we were able to demonstrate a phenomenon of surface catalytic propagation due to a special complex of copper (II) containing ethynyl functions.
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https://tel.archives-ouvertes.fr/tel-01215337
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Submitted on : Wednesday, October 14, 2015 - 1:01:41 AM
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  • HAL Id : tel-01215337, version 1

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Sébastien Lhenry. Nouveaux développements en microscopie électrochimique (SECM) pour l'analyse de surfaces fonctionnalisées. Autre. Université Rennes 1, 2014. Français. ⟨NNT : 2014REN1S150⟩. ⟨tel-01215337⟩

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