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Microwave-Assisted Polyol Synthesis of Water Dispersible Red-Emitting Eu³⁺-Modified Carbon Dots

Dong, Hailong 1; Kuzmanoski, Ana 1; Wehner, Tobias; Müller-Buschbaum, Klaus; Feldmann, Claus 1
1 Institut für Anorganische Chemie (AOC), Karlsruher Institut für Technologie (KIT)


Eu³⁺-modified carbon dots (C-dots), 3–5 nm in diameter, were prepared, functionalized, and stabilized via a one-pot polyol synthesis. The role of Eu$^{2+}$/Eu³⁺, the influence of O₂ (oxidation) and H₂O (hydrolysis), as well as the impact of the heating procedure (conventional resistance heating and microwave (MW) heating) were explored. With the reducing conditions of the polyol at the elevated temperature of synthesis (200–230 °C), first of all, Eu$^{2+}$ was obtained resulting in the blue emission of the C-dots. Subsequent to O₂-driven oxidation, Eu3+-modified, red-emitting C-dots were realized. However, the Eu³⁺ emission is rapidly quenched by water for C-dots prepared via conventional resistance heating. In contrast to the hydroxyl functionalization of conventionally-heated C-dots, MW-heating results in a carboxylate functionalization of the C-dots. Carboxylate-coordinated Eu³⁺, however, turned out as highly stable even in water. Based on this fundamental understanding of synthesis and material, in sum, a one-pot polyol approach is established that results in H₂O-dispersable C-dots with intense red Eu³⁺-line-type emission.

Volltext §
DOI: 10.5445/IR/1000065728
DOI: 10.3390/ma10010025
Zitationen: 19
Web of Science
Zitationen: 19
Zitationen: 23
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000065728
Erschienen in Materials
Verlag MDPI
Band 10
Heft 1
Seiten 25
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter carbon dot; europium; microwave; polyol; surface conditioning
Nachgewiesen in Scopus
Web of Science
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