Propriétés optiques, spectroscopiques et électrochimiques d'auto-organisation tridimensionnelles de nanoparticules

Abstract : This thesis focuses on the characterization of organized assemblies of plasmonic nanoparticles called supracrystals. The nanoparticles have a diameter ranging from 5 to 11 nm diameter and a narrow size distribution allowing their organization at three dimensions. Once the supracrystals were obtained, we measured the absorbance spectrum of individual supracrystals made of various nanoparticles: copper, silver or gold. A simple theoretical model was used to calculate the absorbance spectrum from available data in the literature. We then demonstrated that the supracrystals made of silver or gold nanoparticles are suitable substrates for Surface Enhanced Raman Spectroscopy applications. The sizes of the nanoparticles we use are indeed much smaller than in the literature, so that the number of hot spots and thus the sensitivity are increased. In view of coupling electrochemistry and Raman spectroscopy for future applications, we also measured the reflectance spectrum under potential control. Moreover, conductive AFM and Scanning ElectroChemical Microscopy measurements demonstrate that even if the conductivity of the supracrystals is weak, electron transfers between thin supracrystals and a redox probe in solution are nevertheless possible. Finally, holographic microscopy experiments allowed to follow the formation of these structures inside the solution.
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Pierre Aubertin. Propriétés optiques, spectroscopiques et électrochimiques d'auto-organisation tridimensionnelles de nanoparticules. Cristallographie. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066296⟩. ⟨tel-01455044⟩

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