Nano-silver And Polymer Composites And Photonic Properties

Different kinds of silver nanoparticles coated organic compound were prepared. Photonics proerties of the complex nanoparticles were further investigated by fluorescence spectratrum,Uv-vis spectratrum and Z-Scan technology.The poly- (2-(dimethylamino) ethyl methacrylate)-b- potassium polyacrylate (PDMAEMA-b-PPA) with pH and temperature response was polymerized by Reversible Addition-fragmentation Transfer. The Mn and Mw/Mn of PDMAEMA-b-PPA were 24500g/mol and 1.10, respectively. The block polymer formed micelle or clew with increase in pH in aqueous solution. The micelle or clews were as a template, in which the silver nanoparticles formed. When the pH was 2.6, 8.9 and 12.5, the size of micelle or clews was 35nm,47nm and 12nm, and the size of silver nanoparticles was 35nm, 12nm and 12nm , respectively.Hyperbranced poly(N, N'-methylene bis-acrylamide N-aminoethyl piperazine) (MBA-AEPZ) was synthesized. Its molecule weight and distributions were 1432 g/mol and 1.53, respectively. The poly(amido amine)s was used as dispersion of preparation of silver nanoparticles with lager size (>5nm), and the various sizes and size distributions of silver were obtained by adjusting reaction temperature and concentration of AgNO₃. When concentration of AgNO₃ were 4.0, 8.0, 10.0 and 12.0μg, the size of silver nanoparticles were 9.7 nm, 19.5 nm,37.2 nm and 14.6nm,respectively. The silver nanoparticles with the size of 8.8 nm, 12.3,29.1nm and 15.5nm can be obtained at reaction temperatures of 40.0,50.0,60.0 and 70.0℃, repsectively.Silver Nanoparticles were prepared by reducing AgNO₃ with NaH₄B in the presence of trifluorothenoyl-acetone (TTA) and its size was about 21.0nm. Luminescent properties of Eu(TTA)₃·2H₂O complex and Eu(DBM)₃·2H₂O complex (DBM: Dibenzoylmethane) in methyl methacrylate (MMA) solution had been studied in presence of silver colloidal nanoparticles. Luminescence of Eu(TTA)₃·2H₂O complex was enhanced compared to the Eu(III) complex with the same concentration because it could aggregate around silver nanoparticles. Contrarily, luminescence of...