Khenfouch, M., Bajjou, O., Baitoul, M., Mongwaketsi, N., Maaza, M. & Venturini, W. J. (2015) Optical properties and dynamics excitation relaxation in reduced graphene oxide functionalized with nanostructured porphyrins. Opt. Mater. 42 479–483.
Added by: Laurent Cournède (2016-03-10 18:36:42)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0925-3467
Clé BibTeX: Khenfouch2015
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|Catégories: INTERNATIONAL, PMN
Mots-clés: composite, Exciton life time, Luminescence, nanorods, photoluminescence, Porphyrin nanorods, Raman spectroscopy, reduced graphene oxide, UV-visible-IR absorption
Créateurs: Baitoul, Bajjou, Khenfouch, Maaza, Mongwaketsi, Venturini
Collection: Opt. Mater.
Consultations : 9/460
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Few layers of reduced graphene oxide (FRGO) were functionalized with porphyrins self assembled nanostructure. These new hybrid nanocomposites were investigated using Transmission Electron Microscopy (TEM), UV-visible, Raman scattering, Fourier transform infrared (FT-IR) and photoluminescence. The structural and morphological results show strong interactions between these hybrids components. Moreover, steady state photoluminescence (PL) of both porphyrin nanorods (PM) and (PN)/FRGO composite show clearly the PL quenching confirming a charge transfer from porphyrin molecules to graphene sheets. In addition, the relaxation kinetics of the PM and (PN)/FRGO were studied by means of time resolved photoluminescence (TR-PL) and the excitation density in the sample was of 10(17) cm(3)/pulse. The major change of the carrier dynamics in porphyrin nanorods after their interaction with FRGO was in the increase in the fast time constants, which found to be slower at 650 nm, tau(1) = 196 ps and tau(2) =1171 ps. This has been explained by the change in their energy band gap due to the role of FRGO as doping related to the size of the nanometer-scale sp(2) clusters, which leads to a slower interband carrier recombination. (C) 2015 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède