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Nanostructures hybrides Au/Semi-conducteur : investigation des effets plasmoniques en catalyse sous lumière visible

Abstract : The excitation of Localized Surface Plasmon Resonance (LSPR) of Gold NanoParticles (GNPs) can give many physical effects such as near-field enhancement, heat generation and hot electron injection, which have been investigated in many chemical transformations. In that context, the plasmonic photocatalysis based on electron transfer from GNP to a semi-conductor has been proposed. However, few studies are focused on the influence of LSPR features and the respective contribution of its local effects (thermal and electronic) on the photocatalytic activity. These issues are addressed herein through 3 catalytic reactions. First, the efficient and selective oxidation of glycerol in the presence of supported GNPs is demonstrated under laser irradiation and without any external source of heat, thanks to the local heat generation and hot electron transfer. The respective contributions of these effects is further investigated in plasmonic photocatalysis by following the degradation of Bisphenol-A. Our results show that GNP plays a major role through hot electron transfer but also as a nano-source of heat that accelerates the reaction and leads to a fast and total elimination of this endocrine disruptor. Finally, an optical set-up is developed for studying the plasmonic photocatalysis at the nanoscale. For this, a hybrid system of GNPs coupled to a TiO2 nanofilm is realized by laser nanostructuring. Our investigations show that photocatalytic activity is correlated to the LSPR (size and shape of GNPs, hot spots). These results open the way for exploiting valuable and industrial reactions under solar light
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https://tel.archives-ouvertes.fr/tel-02420649
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Submitted on : Friday, December 20, 2019 - 9:48:08 AM
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  • HAL Id : tel-02420649, version 1

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Zeinab Chehadi. Nanostructures hybrides Au/Semi-conducteur : investigation des effets plasmoniques en catalyse sous lumière visible. Micro et nanotechnologies/Microélectronique. Université de Technologie de Troyes; Université libanaise, 2017. Français. ⟨NNT : 2017TROY0016⟩. ⟨tel-02420649⟩

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