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Green and simple route toward boron doped carbon dots with significantly enhanced non-linear optical properties

2014; Elsevier BV; Volume: 83; Linguagem: Inglês

10.1016/j.carbon.2014.11.032

1873-3891

Athanasios B. Bourlinos, Georgios Trivizas, Michael A. Karakassides, Maria Baikousi, Αntonios Kouloumpis, Dimitrios Gournis, Aristides Bakandritsos, Kateřina Holá, Ondřej Kozák, Radek Zbořil, Irène Papagiannouli, Panagiotis Aloukos, Stelios Couris,

Quantum Dots Synthesis And Properties

Microwave heating of an aqueous solution of citric acid, boric acid and urea affords boron-doped carbon dots (C-dots) with ultrafine size (2–6 nm) and quasi-spherical shape. The new dots are freely dispersible in water providing stable, optically transparent dispersions with olive-green color. The optical properties of the dots were studied in respect to their photoluminescence and nonlinear optical response. Boron-doped C-dots exhibit absorption–emission features that strongly resemble the optical properties of conventional quantum dots with a strong blue fluorescence under UV excitation. Importantly, we demonstrate for the first time that boron doping in C-dots causes a significant enhancement of the nonlinear optical response compared to un-doped carbon dots. This result is in line with previous studies reporting a similar effect on the non-linear optical properties of boron-doped silicon nanocrystals.