Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Graphene oxide with covalently linked porphyrin antennae: Synthesis, characterization and photophysical properties
Δημιουργός/Συγγραφέας:	Karousis, Nikolaos Sandanayaka, Atula S. D. Hasobe, Taku Economopoulos, Solon P. [EL] Σαραντοπούλου, Ευαγγελία[EN] Sarantopoulou, Evangelia [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Εκδότης:	Royal Society of Chemistry
Τόπος έκδοσης:	CAMBRIDGE
Ημερομηνία:	2011
Γλώσσα:	Αγγλικά
ISSN:	0959-9428
DOI:	10.1039/c0jm00991a
Περίληψη:	The 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.
Τίτλος πηγής δημοσίευσης:	Journal of Materials Chemistry
Τόμος/Κεφάλαιο:	21
Τεύχος:	1
Σελίδες:	109-117
Θεματική Κατηγορία:	[EL] Χημεία (Γενικά)[EN] Chemistry (General) [EL] Επιστήμη (Γενικά)[EN] Science (General) [EL] Τεχνολογία (Γενικά)[EN] Technology (General)
Λέξεις-Κλειδιά:	Chemistry, Physical Materials Science, Multidisciplinary
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
EU Grant identifier:	info:eu-repo/grantAgreement/EC/FP7/201729
Κάτοχος πνευματικών δικαιωμάτων:	© ROYAL SOC CHEMISTRY
Ηλεκτρονική διεύθυνση περιοδικού (link) :	http://www.rsc.org/Publishing/Journals/jm/index.asp
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο