Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Photoinduced charge-transfer interactions on a graphene/block copolymer electrostatically bound to tetracationic porphyrin in aqueous media
Δημιουργός/Συγγραφέας:	Skaltsas T. [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios [EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikos
Ημερομηνία:	2013
Γλώσσα:	Αγγλικά
ISSN:	0947-6539
DOI:	10.1002/chem.201300806
Περίληψη:	Stable dispersions of exfoliated graphene in aqueous media with the aid of the amphiphilic block copolymer poly(isoprene-b-acrylic acid) (PI-b-PAA), in the form of its anion, were used to electrostatically bind cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphine tetra(p-toluenesulfonate) (H2P4+). A new graphene/PI-b-PAA--H 2P4+ ensemble was formed and examined by dynamic light scattering, UV/Vis and fluorescence emission spectroscopy. The efficient fluorescence quenching of H2P4+ in the graphene/PI-b-PAA--H2P4+ ensemble was probed by using steady-state and time-resolved photoluminescence, suggesting that electron/energy-transfer phenomena occur within the nanoensemble. Blank experiments validated the concept of electrostatic interactions that govern the formation of graphene/PI-b-PAA--H2P4+ ensemble, which signified the importance of graphene as an electron acceptor toward the preparation of some new donor-acceptor systems. Finally, kinetic analysis of the lifetime profiles of the fluorescence emission gave information regarding the quenching rate constant and quantum yield of the singlet excited state of H 2P4+ in the graphene/PI-b-PAA--H 2P4+ ensemble.
Τίτλος πηγής δημοσίευσης:	Chemistry - A European Journal
Τόμος/Κεφάλαιο:	19
Τεύχος:	28
Σελίδες:	9286-9290
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	charge transfer fluorescence graphene porphyrin UV/Vis spectroscopy
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο