Synthesis And Properties Of The Molydbate Nanocrystals

Controllable synthesis of functional materials with the specific morphology and size has aroused growing interest due to its optical, magnetic, mechanical and other areas of potential applications in the past decade.Metal molybdate due to its unique crystal structure and physical properties have a widely application potential in many fields, such as photoluminescence, microwave devices, optical fiber, scintillating materials, humidity devices, catalysts and so on.Therefore, the preparation technology and application research of metal molybdate become very interested topic.This thesis focuses on the materials of ferrous molybdate, cadmium molybdate and molybdate potassium to achieve controllable synthesis methods that are simple, mild and low-cost, and explore the new properties of these materials. The main contents can be summarized as fallowing:(1) Monoclinic FeMoO₄ nanorods have been prepared by the hydrothermal method in an acid aqueous solution. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectrum, X-ray photoelectron spectra and differential scanning calorimetry are used to characterize the structure, morphology and composition of the sample. The growth mechanism of the FeMoO₄ nanorods is proposed. Seebeck effect and magnetic property were investigated.(2) Potassium molybdate nanoblets was synthesized by molten salt. XRD, SEM and TEM were used to characterizated and analysised the morphology and structure of the material. Photoluminescence properties of materials are tested at room temperature, and electrode performance in lithium batteries of Potassium molybdate nanoblets is also investigated.(3) CdMoO₄ microspheres have been prepared by stirring reacting solution at room temperature. X-ray diffraction spectrum and scanning electron microscopy were used to characterizated the samples.