β Scribed by Ling Zhang; Xia Li; Zhixian Chang; Deliang Li
No coin nor oath required. For personal study only.
Hollow N, Co co-doped TiO 2 /SiO 2 microspheres (CNT) have been prepared by in-suit polymerization and chemical adsorption methods, using polystyrene microspheres (PS) as the templates, tetraethylorthosilicate (TEOS) and tetrabutyltitanate (TBOT) as precursors, triethylamine and cobaltous nitrate as N and Co sources, respectively. The resultant CNT was characterized and compared with TiO 2 /SiO 2 (ST), N-doped TiO 2 /SiO 2 (NT) and Co-doped TiO 2 /SiO 2 (CT) which were synthesized by the same method. Characterization was performed by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS). CNT was observed to be of hollow structure, with nanometer size, broad adsorption wavelength even to 600 nm and high photocatalytic activity. XPS analysis showed that a Ti-O-N bond was formed, while Co mainly existed in the form of CoO x -MO 2 (M =Ti or Si). Co only served to broaden the visible light absorption scope. N and Co cooperated with each other and enhanced the photocatalytic activity.
π SIMILAR VOLUMES
This work reports on the preparation of erbium and ytterbium co-doped SiO 2 :HfO 2 single mode planar waveguides using the sol-gel method. Silica nanoparticles were prepared from tetraethylorthosilicate in basic media and the films were characterized by transmission electron microscopy, scanning ele