A kind of CdS nanocluster with free carboxyl groups on its surface

CdS nanoclusters were directly synthesized in aqueous solution by using mer captoacetic acid as the stabilizer. The results of TEM (Transmission Electr on Microscopy) and ED (Electron Diffraction) show that the structures and a ggregations of the resulting CdS nanoclusters can be affected by the molar ratio of mercaptoacetic acid and Cd2+ ion. When the ratio was high, the res ulting nanoclusters were observed as densely packed layer structure on the template. When the ratio was low, the prepared CdS nanoclusters can not for m highly aggregated structure. Fluorescence spectra of the CdS nanoclusters show a strong yellow fluorescence.