The Synthesis And Characteristic Of Metal Sulfide Or Oxide (M=Fe, Co, Ni) Nanostructures

Metal sulfide or oxide (M=Fe, Co, Ni) nanostructure have shown excellent electrical, optical, magnetic properties. Scientists pay more attentions to the morphologies of materials beacause the structure, morphology and size of the nanostructure have close relationship to their properties. In this paper, we adopted hydrothermal synthesis method to prepare the petal-, urchin- and sphere-like nickel sulfide, cobalt sulfide with hollowed-out surface nanostructures and ferric oxide nanocapsule.1. A facile hydrothermal method has been developed for synthesis of nickel sulfide micro/nanostructure using Ni(NO₃)₂·6H₂O as nickel source, S=C(NH₂)₂ as sulfur source and 1, 2-ethylenediamin/sodiumdodecyl sulfate as surfactant. Different morphologies such as petal-, urchin- and sphere-like nickel sulfide structures have been synthesized by tuning the reaction time, reaction temperature, and the surfactant. The relationship of the fluorescence properties with their morphology and phase was studied, and the possible growth mechanism of nickel sulfide structure was proposed based on the morphology evolution of nickel sulfide.2. Well-defined cobalt sulfide with hollowed-out surface nanostructures was successfully prepared by a facile one-step bottom-up approach, employing Co(NO₃)₂·6H₂O as a cobalt precursor and thiourea as a sulfur source, and a mixed solvent of distilled water and ethanol as reaction solvent without any surfactant. The volume ratio of distilled water to ethanol played an important role in the formation of morphology, as well as reaction time and temperature. And the electrochemical capacitance performance of cobalt sulfide cubes with hollowed out on each face was studied. The results illustrated that the as-prepared cobalt sulfide cubes have excellent electrochemical capacitive characteristic.3. A facile hydrothermal method has been developed for synthesis ofα-Fe₂O₃ nanocapsule using FeCl₃·6H₂O as iron source with 4, 4-bipyridine and S=C(NH₂)₂ as template, and then theα-Fe₂O₃ capsule was coated with TiO₂ to obtain Fe₃O₄@TiO₂ core-shell structure. Then the Fe₂O₃@TiO₂ core-shell product was reduced to Fe₃O₄@TiO₂ core-shell structures at 300°C under continuous hydrogen flow. The Fe₃O₄@TiO₂ core-shell structure can be used as photocataluyst and magneton simultaneity in the solution, which can improve the photocatalytic efficiency greatly.