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Prof. Soo Young PARK
Seoul National University, College of Engineering
Fluorescent Organic Nanowires : Supramolecular Assembly, Enhanced Emission, Charge Transfer, and Switching
mardi 23 février 2010 à 11h
Amphi J. Monod, Tour 42, RdC
Abstract : We have developed a special class of pi-conjugated organic molecules comprising ‘elastic twist’ units which show strong self-assembling tendency to the highly fluorescent organic nanostructures including nanoparticle, nanowire, and nanofabric. Most unique feature of this class of molecules (structure comprises biphenylene-cyanostilbene type backbone as an elastic twist unit) is that the fluorescence emission is totally off in the solution or melt state, while it turns on immediately upon self-assembly into the nanostructure. Self-assembly takes place in the solution, emulsion, bulk, or even in the polymer film with concomitant fluorescence turn-on efficiently heralding the occurrence of self-assembly even to the naked eye observation. Through careful structural and optical characterizations, it was elucidated that the specific intermolecular interaction forces between the elastic twist molecules gave rise to the structural planarization and J-type stacking of the system resulting in the various nanostructures with enhanced fluorescence emission and semiconducting properties. In this talk, I will discuss the molecular design strategies of this special class of molecules, optical properties, nanostructure fabrication, together with their molecular photonics/electronics applications including those in the memory, sensor, display, and transistor.