Abstract
The present paper aims to study the mixing of reduced graphene oxide (RGO) with meso-tetrakis(4-phenylsulfonic-acid)porphyrin [H4TPPS42−] via a covalent functionalization, through a facile synthesis process. The intermolecular interaction was investigated using scanning electron microscope, Raman scattering, Fourier transform infrared spectroscopy, X-ray diffraction. These techniques demonstrated a structural enhancement of the composite, a better conjugation system and the presence of component interaction at the molecular level. UV–Visible absorption, Steady state photoluminescence (PL) as well as time-resolved PL (TRPL) measurements were carried out to further elucidate the nature of electronic interaction between the components. Steady state PL quenching of the porphyrin is in favor of photoinduced electron and/or energy transfer to the RGO. The TRPL results exhibit a decrease in the exciton mean lifetime compared to that of porphyrin’s confirming the presence of significant interaction between H4TPPS42− and RGO, and corroborating the existence of new interbands leading to slower carrier recombination.
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