Preparation And Fluorescence Properties Of The Composite Membrane. Polyoxometalate Bimolecular Research

Polyoxometalates (POMs) are a well-known and significant class of inorganic compounds and currently receiving much attention because of their chemical, structural and electronic versatility and their wide applications in many fields such as catalysis, medicine, biology, and materials science.In this thesis, a series of photoluminescent multibilayer composite films consisting of polyoxometalates and dimethyldioctadecylammonium chloride (DODA) or didodecyldimethylammonium chloride(DDDA) have been prepared via self-assembly and characterized by UV-vis spectroscopy, X-ray diffraction, ellipsometry, scanning electron microscopy, and fluorescence spectroscopy. As shown by UV-vis spectra, the contents of these europium-containing polyoxometalates in the composite films increase with the exchange time and become saturated after a number of days. X-ray diffraction patterns indicate the regular multibilayer structures of these composite films. The XPS measurements confirmed the presentation of POMS and DODA(DDDA) in the multibilayers. The photoluminescent spectrum exhibit characteristic photo luminescence of the Eu3+ ion, basically similar to those found for the polyoxometalate solids.