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Réseaux d'électrodes en diamant fonctionnalisées par des nanoparticules à base de métaux de transition pour applications analytiques

Dounia Kamouni Belghiti 1
1 LCD-LIST - Laboratoire Capteurs Diamant
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : Boron-doped polycrystalline diamond electrodes (BDD) exhibit a number of advantages, including a wide potential window above 3V in aqueous media, a low background current, and excellent resilience to corrosion and fouling. These properties make it a very interesting material for the development of chemical sensors. In order to enhance the reactivity of the BDD electrodes towards a wider range of chemical compounds, we have studied the possibility to deposit on the electrode surface nanoparticles based on transition metals such as platinum or iridium. These nanoparticles exhibit an interesting electro-catalytic activity and open the way to the detection of products derived from enzymatic reactions, pesticides or many other electrochemically non-active species. The aim of this thesis work has been to propose a new method for the deposition of metallic nanoparticles on the diamond surface and to characterize them from a structural and electrochemical point of view. The objective is to develop a multi-sensor detection system composed of several BDD electrodes each functionalized using a different metal catalyst in the form of nanoparticles. The detection system thus enables to obtain a characteristic chemical fingerprint of the product to detect. By assembling several of such sensors, and coupling them with algorithmic learning / recognition methods, the system provides an improved selectivity, in a similar way to an “electronic tongue”. This was applied to several case studies, including the detection of hydrogen peroxide, scatol, indole, paraoxon and imidaclopride.
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Submitted on : Tuesday, September 26, 2017 - 10:25:10 AM
Last modification on : Tuesday, February 11, 2020 - 1:37:48 AM
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Dounia Kamouni Belghiti. Réseaux d'électrodes en diamant fonctionnalisées par des nanoparticules à base de métaux de transition pour applications analytiques. Chimie-Physique [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066055⟩. ⟨tel-01593353⟩

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