Davydov splitting and self-organization in a porphyrin layer noncovalently attached to Single wall carbon nanotubes

Géraud Delport (1) , Fabien Vialla (2, 1) , Cyrielle Roquelet (1) , Stéphane Campidelli (3) , Christophe Voisin (2) , Jean‐sébastien Lauret (1)

1 LAC - Laboratoire Aimé Cotton
2 LPA - Laboratoire Pierre Aigrain
3 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences

We study the ability of porphyrin molecules to cooperate upon adsorption on the sp2 curved surface of carbon nanotube. We discuss the role of the phenyl substituents in the cooperativity of the functionalization reaction. Moreover, a specific spatial organization of the molecules around the nanotube is unveiled through polarization sensitive experiments. Furthermore, we observe an increase of the energy splitting of the porphyrin main transition upon the adsorption on the nanotube. This effect, interpreted as a Davydov splitting, is analyzed quantitatively using a dipole–dipole coupling model. This study demonstrates the ability of porphyrin molecules to create an organized self-assembled layer at the surface of the nanotubes where molecules are electronically coupled together.

Domains: Material chemistry

Géraud Delport, Fabien Vialla, Cyrielle Roquelet, Stéphane Campidelli, Christophe Voisin, et al.. Davydov splitting and self-organization in a porphyrin layer noncovalently attached to Single wall carbon nanotubes. Nano Letters, 2017, 17 (11), pp.6778 - 6782. ⟨10.1021/acs.nanolett.7b02996⟩. ⟨cea-01630881⟩