纳米结构TiO_2/SiO_2的逐层自组装

Layer-by-layer Self-assembly of Nanostructural TiO_2/SiO_2

采用逐层自组装方法在二氧化硅球表面交替组装了十二烷基硫酸钠单分子膜和二氧化钛纳米粒子膜 ,该复合多层膜经高温煅烧后得到了核壳型纳米结构二氧化钛 /二氧化硅复合颗粒 .利用XRD ,SEM ,X射线能谱等对复合颗粒进行了表征 .结果表明 :二氧化钛在复合颗粒表面排列紧密、均匀 ,粒径在 5 0nm左右 ,为锐钛矿型结构 .

Core shell type nanostructure TiO 2 composite spheres have been fabricated by consecutively assembling of surfactant C 12 H 25 SO 4Na(SDS) and titanium dioxide nanoparticles onto SiO 2 micro beads and subsequently removing the surfactant by calcinations. A transparent colloidal solution of extremely fine TiO 2 particles from a precursor of tetrabutyl titanate and the technique of layer by layer (LBL) self assembly were used. The morphology, structure and the amount of TiO 2 of the composite spheres were studied by SEM, XRD and X ray energy spectrum. The results reveal that TiO 2 nanoparticles were dispersed on the surface of the composite spheres and were of rutile type structure with a spherical shape of about 50 nm in diameter. The surface of the composite spheres is dense and uniform. The content of titania in the composite spheres can be readily controlled by varying the number of the nanoparticle surfactant deposition cycles.