Spectroscopie de couches minces d'or dopées avec des molécules fluorescentes

Abstract : In this thesis work we studied the fluorescence properties of gold thin films doped with organic molecules. We have shown by electronic imaging SEM and TEM that they are structured in agglomerates of nanocrystals (5 to 10 nm) covered with molecules forming a nanometric gap. In the quenching spectra we observed the presence of the plasmon resonance of the metal as well as another resonance at 600nm that we attribute to the gap plasmon.The fluorescence emission and excitation spectra confirmed that these fluorescent doped films with a component coming from the fluorescence of gold, and another characteristic of the presence of fluorescent molecules. The spectral shifts in excitation and in emission of both the gold and the molecules are the signs of a strong coupling between their electronic states, which would be in agreement with the very high concentration of molecules in the film (1/100 molar)The non-intuitive observation of the fluorescence of the molecules inserted into the gold layer is due to the considerable increase in their radiative levels that has recently been observed in nanogaps.
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Guillaume Micouin. Spectroscopie de couches minces d'or dopées avec des molécules fluorescentes. Science des matériaux [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAY086⟩. ⟨tel-02272096⟩

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