title: The formation of mesoporous TiO2 spheres via a facile chemical process.
abstract: The mesoporous TiO(2) solid and hollow spheres have been synthesized via a controllable and simple chemical route. Structural characterization indicates that these TiO(2) mesoporous spheres after calcined at 500 degrees C have an obvious mesoporous structure with the diameters of 200-300 nm for solid spheres and 200-500 nm for hollow spheres. The average pore sizes and BET surface areas of the mesoporous TiO(2) solid and hollow spheres are 6.8, 7.0 nm and 162, 90 m(2)/g, respectively. Optical adsorption investigation shows that TiO(2) solid and hollow spheres possess a direct band gap structure with the optical band gap of 3.68 and 3.75 eV, respectively. A possible formation mechanism for TiO(2) solid and hollow spheres is discussed.
authors.affiliation: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. zyxqm@yahoo.com.cn
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Zhang
authors.forename: Guanghai
authors.initials: G
authors.lastname: Li
authors.forename: Yucheng
authors.initials: Y
authors.lastname: Wu
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Luo
authors.forename: Lide
authors.initials: L
authors.lastname: Zhang