Nano et supracristaux d'or : sur l'influence de la nanocristallinité

Abstract : This thesis deals with the influence of crystal defects of gold nanocrystals, especially on the synthesis and self-assembly of gold nanocrystals whose crystal defects and size are controlled. During this work, a method have been developed to separate single and polycrystals with similar size using crystalline segregation. Then, these nanocrystals have been used as seeds for a second crystal growth in order to expand their size from 5 nm to 13 nm in diameter. The plasmonic and vibrational properties of these gold nanocrystals have also been studied. The obtained nanocrystals exhibit low size distribution that allows their self-assemblies into three dimensional ordered lattice, called supracrystals. Negative supracrystals and vicinal surfaces have been observed under specific self-assembly conditions. Moreover, it is possible to obtain supracrystals with submillimeter size containing only either single or polycrystals and study them in an individual way by X-ray diffraction. It has also been possible to correlate the translational and orientational order of gold nanocrystals within the supracrystalline lattice.
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Nicolas Goubet. Nano et supracristaux d'or : sur l'influence de la nanocristallinité. Chimie théorique et/ou physique. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066119⟩. ⟨tel-01492887⟩

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