Sandanayaka, Atula S. D.Hasobe, TakuΣαραντοπούλου, ΕυαγγελίαKarousis, NikolaosΤαγματάρχης, ΝίκοςEconomopoulos, Solon P.CAMBRIDGEThe successful covalent functionalization of graphene oxide (GO) with 5-(4-aminophenyl)-10,15,20-triphenyl-21,23H-porphyrin (H(2)P) has been reported. The resulting GO-H(2)P hybrid material forms stable dispersions in DMF and has been thoroughly characterized by spectroscopic (UV-vis, ATR-IR, Raman) and thermal (TGA) tools. Microscopy techniques (AFM and TEM) have been employed to probe the morphological characteristics as well as to investigate the exfoliation of graphene sheets. Steady-state and time-resolved fluorescence emission studies have shown efficient fluorescence quenching, suggesting that electron transfer occurs from the singlet excited state of the H(2)P moiety to the GO sheet. Photoexcitation resulted in the one-electron oxidation of the H2P with the simultaneous one-electron reduction of GO, yielding (GO)(center dot-)-(H(2)P)(center dot+), as revealed by transient absorption measurements. The electrochemical redox potentials of the graphene-H(2)P material were studied by cyclic voltammetry (CV) and differential pulsed voltammetry (DPV) and the energy gap for the charge-separated state of (GO)(center dot-)-(H(2)P)(center dot+) has been calculated as 0.87 eV, while, the negative free-energy change for the photoinduced charge-separation of GO-H2P has been evaluated to be -1.00 eV, which confirms the thermodynamically favorable formation of (GO)(center dot-)-(H(2)P)(center dot+). Eventually, the GO-H(2)P hybrid material was deposited by electrophoretic deposition onto SnO(2) electrodes, and the OTE/SnO(2)/GO-H(2)P electrode exhibited an incident photon-to-photocurrent-efficiency IPCE of 1.3% in a standard photoelectrochemical cell.109-11710.1039/c0jm00991ahttps://hdl.handle.net/10442/128580959-9428engRoyal Society of Chemistry© ROYAL SOC CHEMISTRY© ROYAL SOC CHEMISTRYJournal of Materials ChemistryMaterials Science, MultidisciplinaryChemistry, PhysicalGraphene oxide with covalently linked porphyrin antennae: Synthesis, characterization and photophysical propertiesΆρθρο σε επιστημονικό περιοδικό2011Δημοσίευση σε περιοδικόPublication in journalΧημείαChemical sciencesFrascati 42Τεχνολογία μέσωνMedia TechnologyΕπιστημονικό άρθροScientific articleΕθνικό Ίδρυμα Ερευνών (ΕΙΕ)Greek Aggregator OpenArchives.gr | National Documentation Centre (EKT)