Résumé:

Dye encapsulation into host single-walled carbon nanotubes is an easy way to create hybrid nano-systems with tunable opto-electronic properties. In this work, we will discuss the supramolecular organization inside the nanotube, the optical properties and the charge transfer as the function of the type of molecules, diameter and metallic or semiconducting character of the host nanotube. A significant electron transfer from encapsulated dyes to the carbon material is reported, whose magnitude strongly depends on the nanotube diameter, in good agreement with DFT calculations, and on the metallic or semiconducting character. Experiments also suggest a photo-activated electron transfer for small diameter (~9 Å) semiconducting and metallic tubes. Dye encapsulation is shown to significantly alter electron-phonon coupling into metallic nanotubes as revealed by the value of the coupling factor extracted from the Fano equation. The charge transfer is consistent with an important enhancement of the photoluminescence intensity up to a factor of nearly six for optimal confinement configuration. This charge transfer shifts the Fermi level, acting on the photoluminescence efficiency and the electron-phonon-coupling.