Preparation And Characterization Of In. Of Zns Nanocrystals

The sodium thioglycollate modified, water-dispersive ZnS with 2-4 nm average particle size was synthesized with the solid phase reaction method at the room temperature using Zn(CH₃COO)₂·2H₂O, Na₂S·9H₂O and thioglycollic acid as the raw materials. Its component and structure were characterized with modern spectroscopic techniques. It was found that the sodium thioglycollate modified ZnS nanoparticles show the high catalytic activity for the photodegradation of methyl orange. Therefore, it may be hopeful for the practical applications of nano-Riged ZnS in the treatment of the waste water with organic compounds.The biomolecule-capped nanoparticles synthesis simulates the mechanism investigation. First, a specific metal ion for the desired semiconductor nanocrystals is chelated by mixing into a solution of biomolecule capping agent such as glutathione. In a suitable of pH and stoichiometry conditions, metal-biomolecule matrices are formed that can act as the centers of nanocrystals growth. Second, inorganic sulfide is introduced into these matrices at various concentrations to initiate the formation of metal-sulfide nanocrystals. Post-preparative isolation techniques such as ethanol precipitation and size-exclusion chromatography are performed to limit sample heterogeneity.In this thesis, we reported on the synthesis of GSH-ZnS and Cys-ZnS nanocrystals. Optimum reaction conditions were obtained to...