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Journal of Inorganic Materials

Journal of Inorganic Materials

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Preparation of Monodisperse SiO2/TiO2/SiO2 Multiply Coated Submicrospheres

LI Qun-Yan1; DONG Peng1; LIU Ren-Xiao1; BAI Yuan-Qiang 2   

  1. 1. State Key Laboratory of Heavy Oil Processing; University of Petroleum; Changping Beijing 102200; China; 2. Institute of Material; Science and Technology University of Beijing; Beijing 100083; China
  • Received:2000-08-23 Revised:2000-10-30 Published:2001-09-20 Online:2001-09-20

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Abstract: The monodisperse SiO2/TiO2/SiO2 multiply coated submicrospheres with uniform size, high refractive index and easily assembling
property for constructing photonic crystals were prepared. The multilayer complex submicrosphere consisted of a colloidal silica sphere as core, a thick titania coating, and a outermost, thin coating of silica. Monodisperse colloidal silica spheres with 200nm in diameter were
synthesized through the hydrolysis of tetraethyl orthosilicate(TEOS) in aqueous ethanol solutions with ammonia as catalyst. The titania coating about 40nm thick on silica cores was formed by the
hydrolysis of titanium n-butoxide(TBOT). The hydrolysis of tetraethyl orthosilicate (TEOS) was still used to get the outermost silica coating about 10nm thick on titania coated silica submicrospheres. The SiO2, TiO2/SiO2
and SiO2/TiO2/SiO2 submicrospheres were characterized with transmission electron microscopy(TEM), energy dispersive X-ray fluorescence spectroscopy(EDS), and the method of gravity sedimentation separately.

Key words: multiply coated submicrospheres, titanium n-butoxide(TBOT), transmission electron microscopy(TEM), gravity sedimentation

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