Different Sizes And Morphologies Of Zns Nanostructures Solvothermal Preparation And Photocatalytic Properties

Highly oriented ZnS nanorod arrays with controlled diameters, the different aspect ratios of ZnS nanobelts, ZnS nanowires-based nanocoil and hierarchical structure were synthesized through solvothermal method.Morphologies and structures of these products were characterized by means of scanning electron microscopy,X-ray diffraction, transmission electron microscopy. The processes of growth, self-assemble of ZnS nanostructures in various geometrical morphologies were studied, and the possible formation mechanisms of ZnS nanostructures were proposed. The photoluminescence, photocatalytic behaviors of highly oriented ZnS nanorod arrays with controlled diameters were studied.and the photoluminescence. current-voltage (I-V) of the different aspect ratios of ZnS nanobelts were studied.The reaction temperature.time impact on the product were investigated.the relations between nanostructures and properties were also investigated. These research results would provide a base for further research on synthesises of ZnS nanostructures, the chemical and physical properties of ZnS nanostructures and their applications in field emission display, electronic and photonic devices, photocatalyst and solar sensor.(1) Highly Oriented ZnS Nanorod Arrays with Controlled Diameters:Solvothermal Synthesis, Size-Dependent Band-Edge Emission and Photocatalytic Properties:Highly oriented ZnS nanorod arrays with controlled diameters were directly synthesized on Zn foil through a simple solvothermal reaction of Zn with thiourea(CS(NH3)2), hydrazine hydrate (N2H4·H2O (80 wt%)) 180℃for 2-13 h.The control over the diameters of the nanorods was achieved by adjusting the reaction time.The as-prepared ZnS nanorods were single-crystalline with a hexagonal wurtzite structure and grown along the [0001] direction.The role of hydrazine hydrate in the formation of ZnS nanorod arrays was investigated,and a possible mechanism was also proposed. The photoluminescence and photocatalytic activities of the as-prepared ZnS nanorod arrays were studied.It was found that the ZnS nanorod arrays exhibit the size-dependent band edge emission and photocatalytic activities in the degradation of acid scarlet.(2) Controlled synthesis of the different aspect ratios of ZnS nanobelts:The different aspect ratios of ZnS nanobelts were synthesized via a solvothermal reaction of Zn with thiourea and NaOH in hydrazine hydrate(80 wt%) at 105℃for 12 h.The control over these nanostructures with different morphologies was achieved by adjusting the quality of NaOH.The photoluminescence and current-voltage (I-V) of the different aspect ratos of ZnS nanobelts were also studied.(3) Controlled synthesis of ZnS nanowires-based nanocoil and hierarchical structure: ZnS nanowires-based nanocoil, hierarchical structure were synthesized in the ZnCl2-CS(NH2)2-N2H4·H2O-(EDTA-2Na) solvothermal system at 180℃for 8 h.The control over these nanostructures with different morphologies was achieved by adjusting(EDTA-2Na)/ CS(NH2)2 molar ratio.