Preparation and optical properties of alloyed Znx Cd1-x S/alginate core/shell nanoparticles.
Znx Cd1-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 Znx Cd1-x S nanoparticles are spherical and have a cubic structure with a mean crystalline size of 2-4 nm. The band gap of Znx Cd1-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 Znx Cd1-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 Znx Cd1-x S and Znx Cd1-x S/alginate core/shell nanoparticles, which has a significant blue-shift with increasing Zn/Cd molar ratio.
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, People's Republic of China.
Liping
L
Wang
Yujie
Y
Sun
D000464:Alginates / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D055620:Optical Phenomena; D013455:Sulfur / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
D000464:Alginates; D006603:Hexuronic Acids; D002104:Cadmium; D013455:Sulfur; D020723:Glucuronic Acid; D015032:Zinc
ZnxCd1-xS nanoparticles; alloyed semiconductor; core/shell structure; optical properties