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Covalent and noncovalent hybrids of di-amino porphyrin functionalized graphene oxide and their interaction with gold nanoparticles

Porphyrin functionalization of graphene oxide (GO) influenced the plasmonic effect of gold nanoparticles (AuNP). The former was achieved by modification of GO with 5,10-bis(4-aminophenyl)-15,20-diphenylporphyrin, P(NH2)2,adj, by noncovalent interactions as well as by covalent association, following...

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Published in:Journal of luminescence 2022-10, Vol.250, p.119097, Article 119097
Main Authors: Andrade, Suzana M., Vaz Serra, Vanda, Bueno-Alejo, Carlos J., Garcia, Ana Rosa, Carvalho, M. Fernanda N.N., Ilharco, Laura M., Neves, Maria Graça P.M.S., Costa, Sílvia M.B.
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container_title Journal of luminescence
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creator Andrade, Suzana M.
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description Porphyrin functionalization of graphene oxide (GO) influenced the plasmonic effect of gold nanoparticles (AuNP). The former was achieved by modification of GO with 5,10-bis(4-aminophenyl)-15,20-diphenylporphyrin, P(NH2)2,adj, by noncovalent interactions as well as by covalent association, following standard chemistry. The success of the chemical functionalization of GO with P(NH2)2,adj, was confirmed by FTIR. Steady-state and time-resolved fluorescence showed a strong fluorescence quenching of porphyrin in the presence of GO, indicative of a photoinduced electron transfer process from porphyrin units to GO, which acts as an electron acceptor. The surface plasmon coupling effect promoted by the AuNP@GO hybrids, proved to be effective only in the case of the noncovalent hybrid, detected through the decrease of the porphyrin fluorescence lifetime and increase in the emission intensity in solution, in good agreement with FLIM results on deposited samples. [Display omitted] •Di-amino phenylporphyrin covalent/noncovalent functionalization of graphene oxide.•Functionalization type determines hybrid's donor-acceptor efficiency.•Gold nanoparticles adsorb differently onto graphene oxide - porphyrin hybrids.•Gold nanoparticles can lead to metal enhanced fluorescence in solution and films.
doi_str_mv 10.1016/j.jlumin.2022.119097
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subjects Confocal fluorescence lifetime microscopy
Graphene
Metal-enhanced fluorescence
Photofunctional materials
Photoinduced electron transfer
title Covalent and noncovalent hybrids of di-amino porphyrin functionalized graphene oxide and their interaction with gold nanoparticles
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