Electrochemical Synthesis Of Zinc Nanoparitcles Via A Zn²⁺-Ligand-Coordinated Vesicle Phase As Template

Nanoparticle synthesis has attracted much attention in recent years as a result of their optical,electronic,magnetic and chemical properties,and their subsequent technological potential applications.It's been noticed that nanostructure synthesis in surfactant assembly as templates via electrochemical method has been increasingly widely applied due to moderate experimental conditions and better controllability.In this paper,we studied electrochemical synthesis of two-dimensional ordered zinc nanoparticles via a metal-ligand-coordinated vesicle phase as template from three aspects as follows:1.Study of the mixed system of and amine oxide surfactant of different CH chain length.System 1.[CH₃(CH₂)₁₀COO]₂Zn/C₁₄DMAODifferent amount of zinc laurate was added into 100mM C₁₄DMAO aqueous solution to form the mixed surfactant system.System 2.[CH₃(CH₂)₁₀COO]₂Zn/C₁₆DMAODifferent amount of zinc laurate was added into 100mM C₁₆DMAO aqueous solution to form the mixed surfactant system.The phase diagrams of both systems were determined through conductivity measurement.The phase behavior was investigated by polarizing microscope,TEM and cryo-TEM.2.The mixed surfactant solutions were subsequently used as the electrolyte for zinc nanoparticles systhesis on the ITO substrate through electrochemical deposition.We systematically studied how the depostion morphology would be influenced by temperature,the molar ratio of surfactants,direct current density and the chain length of amine oxide.We discovered that through SEM observation the deposition morphology(mean particle diameter and dispersion) would be significantly altered by the condition mentioned above.Especially when the vesicle phase was selected as the electrolyte,we obtained zinc nanoparticles with smaller size and much better monodispersity.The source-template model we've applied here is totally different from that of the conventional method.3.Finally,novel ZnO nanostructures on the ITO substrate were prepared from the as-synthesized Zn@ITO nanoparticles.Through SEM observation,we primarily studied how the charging time would influence the morphology of ZnO@ITO and deduced a plausible mechanism of the surface oxidation process.