title: Fabrication and characterization of ZnO@CdS core-shell nanostructure using acetate precursors: XRD, FESEM, DRS, FTIR studies and effects of cadmium ion concentration on band gap.
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.
authors.affiliation: Nanotechnology Laboratory, Department of Chemistry, University of Isfahan, Isfahan 81746-73441 IR, Islamic Republic of Iran. Electronic address: habibi@chem.ui.ac.ir.
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Habibi
authors.affiliation: Nanotechnology Laboratory, Department of Chemistry, University of Isfahan, Isfahan 81746-73441 IR, Islamic Republic of Iran.
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Rahmati
mesh_terms: D000085:Acetates / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D017550:Spectroscopy, Fourier Transform Infrared; D013440:Sulfides / Q000737:chemistry*; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D000085:Acetates; D019187:Cadmium Compounds; D007477:Ions; D013440:Sulfides; D002104:Cadmium; C034939:cadmium sulfide; C028031:cadmium acetate; D015034:Zinc Oxide
keywords: Core–shell; DRS; FESEM; FTIR; Nanostructure; ZnO@CdS