Home > Seminars > Année 2014 > Séminaire de Jean-Sébastien Lauret (28 janvier 2014)
Séminaire de Jean-Sébastien Lauret (28 janvier 2014)
Laboratoire Aimé Cotton, ENS Cachan, CNRS, Université Paris-Sud
Energy transfer in carbon nanotubes/
chromophores assemblies ”
The delocalized p-electronic system of carbon nanotubes allows them to link non-covalently to a large variety of organic molecules. In contrast to covalent functionalization, this mild interaction preserves most of the intrinsic nanotubes properties (photoluminescence, mobility…) but still leads to a strong enough coupling so to give stable supramolecular assemblies and to induce new and efficient functionalities. We focus on nanotubes / chromophores compounds where the latter acts as a nano optical antenna that absorbs light and then transfer almost 100% of the energy to the nanotube.
Compounds made of different chromophores such as metal- or free base porphyrins, porphyrin polymers, and cyanines were synthesized by means of the micelle swelling method. Energy transfer was analysed both on ensembles [5, 6] and at the single compound level. We will first discuss the energy transfer mechanisms in these kinds of supramolecular assemblies. In a second part, we will show that the new functionalities created by the molecules allow to gain new insight into the intrinsic electronic properties of nanotubes.
Affiche de JS Lauret - 69.6 KiB |