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Theses

Dynamique d'auto-assemblages moléculaires bidimensionnels

Abstract : The study of the mechanisms which influence the realization of molecular self-assemblies is central to many different researches in physics, chemistry or biology. In this framework, the surface-organisations formed by monolayer structures constitute attractive systems, both because of their potential applications and of the apparent simplification of the organization process under reduced dimensionality. Moreover, such systems could be studied at the single molecule level by Near Field Microscopy. These techniques permit also real-time observations of the dynamic phenomenon which appear during the assembling process. The scanning-tunnelling-microscopy studies reported here describe, in a first stage, the detailed mechanisms which control the organization of a class of model molecules on the Highly Oriented Pyrolitic Graphite (HOPG) surface. Thus we propose a quantitative analysis of the interplay between intermolecular and molecule–substrate interactions which is known to drive the assembly. This step constitutes the basis of a study devoted to the observation of the dynamic mechanisms which prevail, at the monolayer scale, during and after the molecular organization process. These two chapters lead us to the description of the fundamental rules required for the realization of a nano-porous surface assembly of molecules with original properties: sufficiently stable at room temperature for trapping some guest molecules inside the nano-pores, this matrix present also some dynamic properties which permit to control selectively the transport of these guests through the cavities. These structures can be considered as surface molecular sieves, the operating mechanisms and the physical properties of which are described in details. Finally, results presenting the response of these molecular monolayers to an optical excitation complete this manuscript. They constitute a first step towards an external and local control onto the surface motion of guest molecules.
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https://tel.archives-ouvertes.fr/tel-00143236
Contributor : Guillaume Schull <>
Submitted on : Tuesday, April 24, 2007 - 5:13:31 PM
Last modification on : Monday, October 19, 2020 - 10:53:32 AM
Long-term archiving on: : Monday, June 27, 2011 - 3:05:15 PM

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  • HAL Id : tel-00143236, version 1

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Guillaume Schull. Dynamique d'auto-assemblages moléculaires bidimensionnels. Physique [physics]. École normale supérieure de Cachan - ENS Cachan, 2006. Français. ⟨tel-00143236⟩

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