Synthesis of CdS–Au2S–Au hybrid dendritic nanostructures

The hybrid CdS–Au2S–Au dendritic nanocrystals were synthesized in toluene solution at 70 °C. UV–vis and photoluminescence (PL) spectra recorded the optical properties of hybrid nanostructures, which showed an obvious blue shift relative to the absorption peak of CdS dendritic nanocrystals. The initial CdS dendritic nanocrystals exhibited band gap and trap state emission, both of which were quenched by Au parts. Analysis of the hybrid nanostructures by XRD shows the presence of appreciable amounts of Au2S, indicating that the chemical process involving cation exchanges between Au+ ions and Cd2+ ions was found.