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Εξειδίκευση τύπου : Άρθρο σε επιστημονικό περιοδικό
Τίτλος: Mechanistic insights into the photocatalytic properties of metal nanocluster/graphene ensembles. Examining the role of visible light in the reduction of 4-nitrophenol
Δημιουργός/Συγγραφέας: Koklioti M.A.
Skaltsas T.
Sato Y.
Suenaga K.
Stergiou A.
[EL] Ταγματάρχης, Νίκος[EN] Tagmatarchis, Nikossemantics logo
Εκδότης: Royal Society of Chemistry
Ημερομηνία: 2017
Γλώσσα: Αγγλικά
ISSN: 2040-3364
DOI: 10.1039/c7nr02944f
Άλλο: PubMed ID: 28675211
Περίληψη: Metal nanoclusters (MNCs) based on silver and gold, abbreviated as AgNCs and AuNCs, respectively, were synthesized and combined with functionalized graphene, abbreviated as f-G, forming novel MNC/f-G ensembles. The preparation of MNCs/f-G was achieved by employing attractive electrostatic interactions developed between negatively charged MNCs, attributed to the presence of carboxylates due to α-lipoic acid employed as a stabilizer, and positively charged f-G, attributed to the presence of ammonium units as addends. The realization of MNC/f-G ensembles was established via titration assays as evidenced by electronic absorption and photoluminescence spectroscopy as well as scanning transmission electron microscopy (STEM) and energy-dispersive X-ray (EDX) spectroscopy analyses. Photoinduced charge-transfer phenomena were inferred within MNCs/f-G, attributed to the suppression of MNC photoluminescence by the presence of f-G. Next, the MNC/f-G ensembles were successfully employed as proficient catalysts for the model reduction of 4-nitrophenol to the corresponding 4-aminophenol as proof for the photoinduced hydrogen production. Particularly, the reduction kinetics decelerated by half when bare MNCs were employed vs. the MNC/f-G ensembles, highlighting the beneficial role of MNCs/f-G in catalysing the process. Furthermore, AuNCs/f-G displayed exceptionally higher catalytic activity both in the dark and under visible light illumination conditions, which is ascribed to three synergistic mechanisms, namely, (a) hydride transfer from Au-H, (b) hydride transfer from photogenerated Au-H species, and (c) hydrogen produced by the photoreduction of water. Finally, recycling and re-employing MNCs/f-G in successive catalytic cycles without loss of activity toward the reduction of 4-nitrophenol was achieved, thereby highlighting their wider applicability.
Τίτλος πηγής δημοσίευσης: Nanoscale
Τόμος/Κεφάλαιο: 9
Τεύχος: 27
Σελίδες: 9685-9692
Θεματική Κατηγορία: [EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistrysemantics logo
[EL] Φασματοσκοπία[EN] Spectroscopysemantics logo
Αξιολόγηση από ομότιμους (peer reviewed): Ναι
Κάτοχος πνευματικών δικαιωμάτων: © 2017 The Royal Society of Chemistry.
Σημειώσεις: Japan Society for the Promotion of Science, KAKEN: 16H06333, 16K05948; Japan Science and Technology Agency, JST; General Secretariat for Research and Technology, GSRT MIS: 5002409
Partial financial support by the General Secretariat for Research and Technology, Greece, through project "Advanced Materials and Devices" (MIS: 5002409) to NT is acknowledged. YS and KS acknowledge financial support from JSPS KAKENHI (grant numbers JP16 K05948 and JP16H06333) and the JST Research Acceleration Program.
Εμφανίζεται στις συλλογές:Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο

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