Three-Dimensional Arrays Formed by Monodisperse TiO(2) Coated on SiO(2) Spheres.
Uniform coatings of TiO(2) on monodisperse spheres of silica have been obtained. The resulting particle sizes are within the range 0.4 to 1 µm. The thickness of the coating can be controlled by adjusting nuclei sizes (silica sphere), reaction times, and water and surfactant concentrations. The TiO(2)/SiO(2) spheres were sedimented to achieve structures with three-dimensional order. Three-dimensional ordered materials with higher refractive index were obtained by transforming the amorphous titania layer to rutile by thermal treatment with improved mechanical rigidity. The sphere composition, quality, and morphology have been assessed by different techniques. Copyright 2000 Academic Press.
Holgado
M
Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Contoblanco, Madrid, 28049, Spain
Cintas
A
Ibisate
M
Serna
CJ
López
C
Meseguer
F