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Preparation and optical properties of alloyed Zn x Cd 1‐ x S/alginate core/shell nanoparticles
Author(s) -
Wang Liping,
Sun Yujie
Publication year - 2015
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2695
Subject(s) - nanoparticle , zinc , cadmium sulfide , zinc sulfide , photoluminescence , transmission electron microscopy , materials science , nuclear chemistry , cadmium , analytical chemistry (journal) , crystallography , chemical engineering , nanotechnology , chemistry , metallurgy , organic chemistry , engineering , optoelectronics
Zn x Cd 1‐ x S/alginate core/shell nanoparticles were synthesized via a colloidal route by reacting zinc and cadmium ions with sulfide ions, followed by coating with alginate. The crystal structure, morphology, size and optical properties of the core/shell nanoparticles were characterized by X‐ray diffraction, transmission electron microscopy, UV/vis and photoluminescent spectra, respectively. The Zn x Cd 1‐ x S nanoparticles are spherical and have a cubic structure with a mean crystalline size of 2–4 nm. The band gap of Zn x Cd 1‐ x S/alginate core/shell nanoparticles increases with increasing Zn/Cd molar ratio, and the UV/vis absorption blue‐shifts correspondingly. Two emissions related to zinc and sulfide ion vacancies were observed for the Zn x Cd 1‐ x S/alginate core/shell nanoparticles due to the surface changes from the alginate coating. A cadmium‐related emission was observed for both the uncovered Zn x Cd 1‐ x S and Zn x Cd 1‐ x S/alginate core/shell nanoparticles, which has a significant blue‐shift with increasing Zn/Cd molar ratio. Copyright © 2014 John Wiley & Sons, Ltd.
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