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Design of Carbon Dots for Metal-free Photoredox Catalysis
Department of Molecular Sciences and Nanosystems, Università Ca’ Foscari Venezia, Via Torino 155, 30172 Venezia Mestre, Italy.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4598-9556
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, 00184 Roma, Italy.ORCID iD: 0000-0002-3443-3707
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-2935-1165
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 47, p. 40560-40567Article in journal (Refereed) Published
Abstract [en]

The photoreduction potential of a set of four different carbon dots (CDs) was investigated. The CDs were synthesized by using two different preparation methods—hydrothermal and pyrolytic—and two sets of reagents—neat citric acid and citric acid doped with diethylenetriamine. The hydrothermal syntheses yielded amorphous CDs, which were either nondoped (a-CDs) or nitrogen-doped (a-N-CDs), whereas the pyrolytic treatment afforded graphitic CDs, either non-doped (g-CDs) or nitrogen-doped (g-N-CDs). The morphology, structure, and optical properties of four different types of CDs revealed significant differences depending on the synthetic pathway. The photocatalytic activities of the CDs were investigated as such, that is, in the absence of any other redox mediators, on the model photoreduction reaction of methyl viologen. The observed photocatalytic reaction rates: a-N-CDs ≥ g-CDs > a-CDs ≥ g-N-CDs were correlated with the presence/absence of fluorophores, to the graphitic core, and to quenching interactions between the two. The results indicate that nitrogen doping reverses the photoredox reactivity between amorphous and graphitic CDs and that amorphous N-doped CDs are the most photoredox active, a yet unknown fact that demonstrates the tunable potential of CDs for ad hoc applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 10, no 47, p. 40560-40567
Keywords [en]
carbon dots, carbon nanomaterials, citric acid, methyl viologen, photocatalysis, photoreduction, photosensitizer, structure−reactivity relationship
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-71591DOI: 10.1021/acsami.8b14188ISI: 000451932800021PubMedID: 30370767Scopus ID: 2-s2.0-85057216827OAI: oai:DiVA.org:ltu-71591DiVA, id: diva2:1263383
Note

Validerad;2018;Nivå 2;2018-12-04 (inah)

Available from: 2018-11-15 Created: 2018-11-15 Last updated: 2019-03-27Bibliographically approved

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Mazzaro, RaffaelloEnrichi, FrancescoVomiero, Alberto

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