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Interactions between an Aryl Thioacetate-Functionalized Zn(II) Porphyrin and Graphene Oxide

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Resumo:The surface modification of graphene oxide (GO) is carried out via the supramolecular functionalization route using a Zn(II)-porphyrin which is soluble in common organic solvents on basis of long alkyl chains present at the exocyclic positions. This acts as a dispersing agent and decorates the surface of the graphene oxide uniformly, giving rise to a new nanohybrid denoted Zn(II)-porphyrin@GO. The resulting Zn(II)-porphyrin@GO nanohybrid forms a stable dispersion in ethanol (as characterized by several different spectroscopic techniques such as UVvis, Fourier transform infrared, Raman). The morphology of Zn(II)-porphyrin@GO nanohybrid is investigated by atomic force microscopy (AFM) and transmission electron microscope (TEM)/selected area electron diffraction. Both TEM and AFM measurements indicate that the Zn(II)-porphyrin self-assemble onto the surface of graphene oxide sheets. Steady-state and time-resolved fluorescence emission studies in the dispersed phase, and as a thin film, point toward the strongly quenched fluorescence emission and lifetime decay, suggesting that energy transfer occurs from the singlet excited state of Zn(II)-porphyrin unit to GO sheets.
Autores principais:Mao, Boyang
Outros Autores:Calatayud, David G.; Mirabello, Vincenzo; Hodges, Benjamin J.; Martins, J. A. R.; Botchway, Stanley W.; Mitchels, John M.; Pascu, Sofia I.
Assunto:AFM studies fluorescence emission titrations graphene oxide porphyrin UVvis titrations
Ano:2016
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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