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Etude et compréhension des mécanismes d'interaction de composés organiques volatils (COV) par des couches polymères : application à la microdétection des polluants des environnements intérieurs

Abstract : Conducting polymers can be used as active materials of sensing devices that find application in different areas, such as quality control of products in industries such as food and beverage, cosmetics and solvents, in the monitoring of air quality for environmental and safety purposes, and as an auxiliary tool in the diagnosis of diseases. In spite of this, as a general rule, the details of the prevailing interactions of the volatile compounds and the polymer are not well understood. For this reason, we have focused the work of this thesis on the characterization of the interactions between vapors of volatile organic compounds and thin films of conducting polymers. These films, that were the active components of the sensors, were prepared atop of different geometry of interdigitated electrodes via electropolymerization, where several preparation parameters (such as doping agents nature and concentrations, monomer nature, thermal annealing) were observed to assure an homogeneous growth of the polymeric film. Several characterizations such as electrochemical studies, AFM observations and UV-VIS-NIR spectra studies were used to obtain detailed information about the interaction mechanisms between VOC and conducting polymers. We have also measured the contact angle of water, formamide and diiodomethane deposited on the surface of the polymeric films to evaluate surface free energy (and its acid-base and dispersive components). The selectivity and sensitivity of the polymeric sensors when exposed to different volatile organic compounds (VOCs) have shown to be dependent not only of the properties of the analyzed VOC but also on the nature of the counter-ion used to dope the polypyrrole film. As a final conclusion, we can say that as a result of this work it becomes possible to optimize the design of an arrangement of sensors such that both a better sensitivity and a better selectivity sensitivity to a given chemical environment can be achieved.
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https://hal-cstb.archives-ouvertes.fr/tel-03840840
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Submitted on : Sunday, November 6, 2022 - 11:07:22 AM
Last modification on : Sunday, November 6, 2022 - 11:07:22 AM

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  • HAL Id : tel-03840840, version 1

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Rukshala Anton. Etude et compréhension des mécanismes d'interaction de composés organiques volatils (COV) par des couches polymères : application à la microdétection des polluants des environnements intérieurs. Chimie. Université de Cergy-Pontoise, 2013. Français. ⟨NNT : ⟩. ⟨tel-03840840⟩

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