Preparation Of Three-dimensional Polyoxometalate Thin Film By Colloidal Crystal Template And Its Properties

The studies on three dimensional ordered thin film of polyoxometalates have drawn more and more attention owing to their potential applications in luminescence, magnetism, electrics, biomedicine and catalysis. To fabricate films compose of polyoxometalate functional molecules is crucial to both fundamental research and application. This work deals with the preparation of the three dimensional ordered polyoxometalates-based thin film with multifunctional. We have realize the three dimensional polyoxometalate-based thin film by colloidal crystal template, sol-gel technique.1. The H₃PW₁₂O₄₀/ SiO₂ (PW12/ SiO₂)three-dimensional ordered thin film was prepared by using polystyrene (PS) colloidal crystal as template, filling the PW12/ SiO₂ sol into the void of template, after remove the template, the PW12/ SiO₂ three-dimensional ordered thin film was formed. The structures and properties of thin film was characterized by ultraviolet-visible absorption spectra, X-ray photoelectron Spectroscopy, scanning electron microscopy.2. The [Eu(PW₁₁O₃₉)₂],[Gd(PW₁₁O₃₉)₂] and [Eu(P₂W₁₇O₆₁)₂] composite with SiO₂ three-dimensional ordered thin films have been fabricated by template and sol-gel technique. The fluorescence property of the thin films has been researched.3. Polyoxometalate Cs3PW12O40 three-dimensional ordered thin film fabricated by PS template method. We also obtain the Cs3PW12O40 three-dimensional ordered thin film with the hollow sphere.4. PS@PW12 core-shell structure has been prepared by PS colloid template and CTAB assistance, and by this way, the thin film of PW12 hollow sphere has been fabricated.We prepared polyoxometalate three-dimensional ordered thin film firstly, and the results showed well layer and order, especially, the polyanion in the film has remained the original structure.