Monocouches nanoporeuses auto-assemblées sur graphite : contrôle et modulation des propriétés de tamis moléculaire.

Claire Arrigoni 1
1 LEPO - Laboratoire d'Electronique et nanoPhotonique Organique
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : One purpose of the recent studies concerning functionalized surfaces at the nano-scale is to control the properties of the self-assembly. By exploiting alkyl chain interdigitation, a class of molecules has been designed, able to bond through a non-covalent "clip" activated by the HOPG surface. Self-assembled nanoporous matrice, able to host smaller molecules has been realized. Both intra- and inter-pore diffusion dynamics of guest molecules have been probed at the liquid-solid interface, in real time. The extreme sensitivity of the diffusion processes on the nature of the guest molecule has been showed and the mechanisms of this 2D molecular sieve have been studied. The aim of the present work is to extend the properties as molecular sieve of this nanoporous structure. At first, the way to control the self-assembly process in order to favor the nanoporous structure was studied. Then, different ways to adapt molecular hosting in these 2D molecular sieves to specific target molecules were explored. The feasibility of modulating the size of the generated cavities was demonstrated for example by varying the length of the alkyl chains. Other way to change the molecular sieve properties is to modify the shape of the cavities thanks to odd-even effects. To lead the molecular sieve to application in the field of biology, the polarity of the cavities must be changed. First steps of this direction are presented.
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Claire Arrigoni. Monocouches nanoporeuses auto-assemblées sur graphite : contrôle et modulation des propriétés de tamis moléculaire.. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00623515⟩

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