Gatti, Riccardo
(2014).
STM and OFT Study of 20 Self-Assembled Molecular Nanostructures on Surfaces
Mémoire.
Québec, Université du Québec, Institut national de la recherche scientifique, Maîtrise en sciences de l'énergie et des matériaux, 197 p.
Résumé
The self-assembly of organic molecules was investigated on surfaces at the liquid-solid
interface with scanning tunneling microscopy (STM), a technique that allows real-space
imaging of single molecules with sub-nm resolution. Combining the experimental data with
density functional theory (DFT) calculations provides insight in the nature of the weak
intermolecular bonds involved in the lateral stabilization of the investigated systems. Surface
polymerization of the assembled structures was also attempted, an important step towards
practical applications thanks to the higher stability and better electronic properties of the
polymerized structures.
Self-assembly is a powerful technique for the fabrication of organic thin layers and the
bottom-up nanopatterning of surfaces. This work describes fundamental aspects of self-assembly
at the sub-molecular scale. Despite being important in small-molecule devices,
much still has to be learned about this fascinating phenomenon, especially in terms of
rationally controlling the assembly. This works contributes to the basic understanding of
molecular self-assembly.
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