Hydrothermal synthesis and characterization of nanorods of various titanates and titanium dioxide

被引:295
作者
Kolen'ko, YV
Kovnir, KA
Gavrilov, AI
Garshev, AV
Frantti, J
Lebedev, OI
Churagulov, BR
Van Tendeloo, G
Yoshimura, M
机构
[1] Tokyo Inst Technol, Ctr Mat Design, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Moscow MV Lomonosov State Univ, Dept Mat Sci, Moscow 119992, Russia
[3] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium
[4] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia
关键词
D O I
10.1021/jp055687u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The formation process of titania based nanorods during hydrothermal synthesis starting from an amorphous TiO2-nH(2)O gel has been investigated. Sodium tri-titanate (Na2Ti3O7) particles with a rodlike morphology were prepared by a simple hydrothermal process in the presence of a concentrated NaOH aqueous solution. The ion exchange reaction of the synthesized Na2Ti3O7 nanorods with HCl under ultrasonic treatment promotes a complete sodium substitution and the formation of H2Ti3O7 nanorods. Low-temperature annealing of the as-produced nanorods of Na2Ti3O7 and H2Ti3O7 leads to a loss of the layered crystal structure and the formation of nanorods of condensed framework phases-sodium hexa-titanate (Na2Ti6O13) and metastable TiO2-B phases, respectively. These transformations proceed without a significant change in particle morphology. The nanostructures were investigated by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET) method, thermogravimetric analysis (TGA), and Raman spectroscopy. The structural defects of the synthesized nanorods were investigated by high-resolution electron microscopy. The presence of planar defects can be attributed to the exfoliation of the zigzag ribbon layers into two-dimensional titanates as well as to the condensation of the layers of TiO6 octahedra into three-dimensional frameworks.
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页码:4030 / 4038
页数:9
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