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Theses

Elaboration et caractérisation des nanomatériaux à base de métaux nobles

Abstract : In this thesis work, the synthesis of silver nanoparticles (Ag) is carried out by a simple, efficient and fast method based on the reduction of silver nitrate (AgNO3) in an organic medium (ethanol) under heating by micro irradiation (MW) for a few seconds in the presence of an aqueous emulsion of latex copolymer. The experiments were performed either by varying the experimental parameters one after the other (classical approach) or by means of the experimental design methodology which serves to vary simultaneously these experimental conditions in order to both optimize and evaluate the impact of these factors on the physicochemical properties of the nanoparticles. The main goal is to prepare a maximum concentration of silver nanoparticles with a minimum concentration of latex copolymer and AgNO3. The prepared nanoparticles were found to be extremely stable in colloidal solution with very narrow size distributions, which confirms the high quality and the uniform diameter of the nanoparticles obtained by the microwave synthesis approach. This could possibly be due to the stabilizing effect produced by the latex molecules, which is a good environment for effectively controlling the growth of metallic silver nanoparticles. As the main objective of such realization of the silver nanoparticle synthesis by the MW method opens the way to the exploration of surface plasmonic effects in photocatalytic reactions using well-defined semiconducting structures (Bi2O3 , In2O3, TiO2 ...).
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https://tel.archives-ouvertes.fr/tel-01794539
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Submitted on : Thursday, May 17, 2018 - 3:57:16 PM
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  • HAL Id : tel-01794539, version 1

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Mina Ider. Elaboration et caractérisation des nanomatériaux à base de métaux nobles. Physique [physics]. Université du Maine, 2017. Français. ⟨NNT : 2017LEMA1022⟩. ⟨tel-01794539⟩

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