Preparation And Characterization Of Novel Functionalized Mesoporous Silica And Their Polymer Hybrid Materials

Functionalized mesoporous materials show a large BET surface area, controllable distributed pore sizes and a pore arrangement, thermal and mechanical stability, and featuring high functionality. These materials are known to be promising candidates for the use in electronic, catalysis, chemical and biochnological industries, and biomedical fields. The wall surface of mesoporous silica can be modified with proper organic functional groups and provide accessibility for anchoring other substances. Accordingly, host-guest complexes have been synthesized from mesoporous silica for such purposes as electronic devices, optical applications, biology. Recently, the immobilization of luminary on a rigid support is a very important way to prepare new solid luminescent materials which show special photonic behavior. A number of studies have focused on the incorporation of luminary into the mesoporous silica. For examples, semiconductor nanocrystals, dye molecules, conjugated polymer and rare-earth complexes have been immobilized in the mesoporous materials to synthesize new luminescent materials.In this work, the Znq₂ was successfully incorporated into the mesoporous silica with different nanosize dimensions, and nanosized ZnS was prepared inside mesoporous silica by in situ and was functionalized with 8-hydroxyquinoline. Theses nanoparticles were endowed with good optical properties. At the same time, the effect of the mesoporous silica on the optical properties of nanoparticles was studied. The results indicated that the interaction between host and guest had great influence on the photoluminescence properties of these fluorescent metal complexes. In addition, to realize the function and to impart these fluorescent nanoparticles with excellent processability, a series of transparent luminescent bulk nanocomposites were prepared by in situ bulk polymerization in the presence of nanoparticles. The results indicated that after the nanoparticles were introduced into the polymer matrix, the excitation and emission peak positions of the nanoparticles had obvious shift. These functional nanoparticles and their polymer nanocomposites can be potentially used to design and fabricate novel photoelectric devices.