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Direct synthesis of luminescent SiC quantum dots in water by laser ablation
Author(s) -
Zakharko Yu.,
Rioux D.,
Patskovsky S.,
Lysenko V.,
Marty O.,
Bluet J.M.,
Meunier M.
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105284
Subject(s) - photoluminescence , quantum dot , luminescence , laser ablation , nanoparticle , zeta potential , materials science , laser , spectroscopy , etching (microfabrication) , charge carrier , optoelectronics , photochemistry , nanotechnology , chemistry , optics , physics , layer (electronics) , quantum mechanics
Direct synthesis of luminescent SiC quantum dots in pure deionized water by laser ablation is reported. A zeta‐potential of –49 mV, higher than for nanoparticles produced by electrochemical etching, suggests a higher colloidal stability of the laser‐produced nanoparticles. IR spectroscopy shows that surface charges related to carboxylate anions ensure long‐term stability of the colloidal solutions based on the as‐prepared SiC quantum dots. Main radiative channel at room temperature corresponds to the recombination of quantumly confined photogenerated charge carriers. Emission from the nanoparticles is mainly centred at 2.75 eV regardless of laser power used for ablation. According to photoluminescence spectra, a partial transformation of the SiC quantum dots from cubic to hexagonal crystalline arrangement is supposed. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)