Abstract
ZnO@CdS core–shell nano-structure has been synthesized using zinc acetate dihydrate, and cadmium acetate dihydrate as simple precursors in a water–ethanol matrix without using any surfactant, ligand or chelating agents. The effect of different concentrations of cadmium acetate and sodium sulfide on optical and electronic properties of ZnO@CdS core–shell was investigated. The morphology and structure of the ZnO@CdS core–shell nano-structures have been confirmed by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) measurements. The results showed that the ZnO@CdS core–shell nano-structure is mixed cubic and hexagonal structures. FESEM results showed the mono-dispersed and uniform size of 39nm. Optical properties were studied by UV–visible diffuse reflectance spectroscopy (DRS) technique and the results showed that band gaps of ZnO@CdS core–shell nanocomposites were red shifted by increasing the cadmium concentration. FTIR spectrum of ZnO@CdS core–shell nano-structure showed a band at 482cm−1 correlated to ZnO bond and a band at 630cm−1 due to the stretching frequency of CdS bond.
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