Low temperature hydrothermal synthesis of CdS submicro- and microspheres self-assembled from nanoparticles

CdS submicro- and microspheres self-assembled from nanoparticles are prepared by convenient hydrothermal process through the reactions of CdCl2 center dot 2.5H(2)O and Na2S2O3 center dot 5H(2)O in aqueous solution at a relatively low temperature (100 degrees C). The X-ray diffraction (XRD) analyses indicate that the products were hexagonal CdS. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation reveal that the products consist of a large number of submicro- and microspheres which are self-assembled from nanoparticles with sizes of about 10-20 nm. The Raman spectra of the spheres are presented. The influencing factors about the morphologies of product are discussed, too. (c) 2007 Elsevier B.V. All rights reserved.