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Controlled Synthesis, Growth Mechanism, and Properties of Monodisperse CdS Colloidal Spheres
Author(s) -
Li XinHao,
Li JiXue,
Li GuoDong,
Liu DaPeng,
Chen JieSheng
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700754
Subject(s) - dispersity , nucleation , materials science , colloid , nanocrystal , nanotechnology , spheres , chemical engineering , colloidal crystal , chemistry , polymer chemistry , organic chemistry , physics , astronomy , engineering
Highly monodisperse submicrometer CdS colloidal spheres (CSCS) with a controllable and tunable size (between 80 and 500 nm) have been synthesized through a facile solvothermal technique. Owing to the controllability of the reaction process, the growth mechanism of the colloidal spheres has been elucidated in detail. The whole growth process can be summarized as homogenous and slow nucleation of nanocrystals, formation of “cores” through 3D‐oriented attachment of nanocrystals, and further surface‐induced growth to monodisperse colloidal spheres through in situ formation and random attachment of additional nanocrystals. It has been demonstrated that the obtained CSCS colloidal particles are able to be assembled into films which show characteristic stop band gaps of photonic crystals. By using the CSCS as a template, Ag 2 S, Bi 2 S 3 , Cu 2 S, HgS, and Sb 2 S 3 colloidal spheres, which are difficult to obtain directly, have also been prepared successfully through ion exchange.