期刊
MATERIALS LETTERS
卷 66, 期 1, 页码 121-124出版社
ELSEVIER
DOI: 10.1016/j.matlet.2011.08.025
关键词
ZnS:Co2+; Nanoparticles; Low temperature hydrothermal synthesis; Structural; Optical properties
资金
- National Natural Science Foundation of China [60890203, 60771016]
Water-soluble ZnS:Co2+ nanocrystals (NCs) were synthesized by a low temperature hydrothermal process using 3-mercaptopropionic acid (MPA) as capping agent and the influence of doping on the optical properties of ZnS:Co2+ NCs was investigated. It was found that the ZnS:Co2+ NCs are highly crystalline and show zinc blende structure with an average particle size of about 7 nm. The lattice constant of the ZnS:Co2+ NCs decreases slightly by the introduction of Co2+. The Co dopants were well doped into the ZnS:Co2+ NCs, as confirmed by X-ray photoelectron spectroscopy(XPS) and the (4)A(2)(F) -> T-4(1)(P) transition of Co2+ was detected from the UV-vis absorption spectra. The absorption edge of the ZnS:Co2+ NCs is blue-shifted as compared with that of bulk ZnS, indicating the quantum confinement effect. The PL intensity of the NCs shows the maximum value when the Fe-doping concentration is 0.5 at.%. (C) 2011 Elsevier B.V. All rights reserved.
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