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Influence des paramètres physiques sur l'auto-assemblage bidimensionnel d'une série d'hexa-péri-hexabenzocoronènes étudiée par STM à l'interface liquide-solide

Abstract : Supramolecular 2D networks are attracting considerable interest as highly ordered functional materials for applications in nanotechnology. The challenge consists in directing the ordering or predesigned molecular species into periodic architectures over extended length scales with atomic precision. Highly-organized supramolecular 2D arrays can be obtained by self-assembly of molecules which interlock via chemical or physical interactions. This work carries on the impact of the chemical and physical parameters on the self-assembly processes of a serie of coronene derivatives studied by scanning probe microscopy at the liquid-solid interface. By adjusting the subtle interplay between molecule-molecule and molecule-substrate, it is possible to tailor a variety of 2D self-organized architecture based on functional organic molecules bearing crystal liquid phases. Controlling the nanostructuration is an important step to optimize the transport properties and consenquently their studies in a device conformation like in a field effect transistor or in a photovoltaic cell. The studied 2D supramolecular networks depends on weak interactions (Van Der Waals type, π, H-bondings) between molecules, and on weak or strong (covalent) interactions between molecules-substrate. We show here that the variation of the solvent, the concentration, the substitution, the temperature and nature of the substrate can modify the interplay of theses interactions and consequently, the observed polymorphism. We found a correlation between the effect of the variation of the solvent and this of the length of the substituants and we determine the conditions to stabilise one phase compare to another one. In order to study the temperature effect, we perform our experiments by adjusting in situ the substrate temperature. This allows to reveal phases transitions induced by the temperature. Correlations of all these parameters allows to build a phase diagram and to deep insight their formation mechanisms.
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Submitted on : Wednesday, September 15, 2010 - 2:13:53 PM
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  • HAL Id : tel-00517755, version 1

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Camille Marie. Influence des paramètres physiques sur l'auto-assemblage bidimensionnel d'une série d'hexa-péri-hexabenzocoronènes étudiée par STM à l'interface liquide-solide. Chimie. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00517755⟩

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