The Study Of Fabricating Polyoxometalate-based Uniform Composite Films By Electrophoretic Deposition Method.

Polyoxometalates (POMs) are the molecular clusters of the early transition metaloxides, especially for the elements of vanadium, molybdenum and tungsten. POMs have the variety in composition and structure, which makes them have great potential in catalyst, medicine, magnetism, luminescence, nonlinear optics, proton conductivity etc.Polyoxometalates are generally considered as promising inorganic building blocks and to assemble POMs into defined structures can be effectively applied in many fields. The direct use of POM-containing amphiphiles to construct POM-based self-assembly has attracted much attentionin in recent years. In this thesis, firstly, we encapsulated POMs with the cationic surfactants and prepared the organic/inorganic supramolecular complexes, then we fabricated thin films by Electrophoretic deposition (EPD) method.EPD method was well used for preparation of inorganic film materials many years ago. Because of its simplicity and controllability, the electrophoretic method has become a favorable way to assemble various interesting nanometer materials. The EPD method is a facile and versatile technique that has lately emerged as a viable approach to prepare large area ultra-thin films. Herein, we provides a new route to explore the possibility of application to polyoxometalate-based hybrid inorganic–organic materials by the EPD method. It is the first report that the POM-based thin films are fabricated using this method. This approach combines several processing methods together: including sol-gel processing, electrophoretic deposition, and template-based growth. The film obtained by EPD is of a spherical assembly with uniform size. the surface of the thin film is very flat. The facile electrochemistry of the composite film will probably be used to prepare a sensitive conductometric catalytic electrode and to construct thin film molecular electronic devices based on POMs in future work.