Synthesis of uniform anatase TiO2 nanoparticles by gel-sol method 4.: Shape control

被引:275
作者
Sugimoto, T [1 ]
Zhou, XP [1 ]
Muramatsu, A [1 ]
机构
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan
关键词
anatase; titania; shape controller; amines; triethanolamine; diethylenetriamine; sodium oleate; sodium stearate;
D O I
10.1016/S0021-9797(03)00035-3
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
Uniform anatase-type TiO2 nanoparticles of different shapes have been formed by phase transformation of a Ti(OH)4 gel matrix in the presence of shape controllers. For example, triethanolamine (TEOA) was found to change the morphology of TiO2 particles from cuboidal to ellipsoidal at pH above 11. The shape control can be explained in terms of the specific adsorption of TEOA onto the crystal planes parallel to the c-axis of the tetragonal system in the alkaline range, as supported by the observation of preferential adsorption of TECA onto the crystal planes parallel to the c-axis at pH 11.5 and by the pH dependence of the adsorption onto ellipsoidal particles. Diethylenetriamine (DETA) also modified the particle shape to ellipsoidal above pH 9.5 and the aspect ratio was much higher than with TECA. The mechanism of the shape control could be explained in the same way as with TEOA, since analogous specific adsorption was observed with DETA as well. Similar shape control to yield ellipsoidal particles of a high aspect ratio was also achieved with other primary amines, such as ethylenediamine (ED), trimethylenediamine (TMD), and triethylenetetramine (TETA). However, secondary amines, such as diethylamine, and tertiary amines, such as trimethylamine and triethylamine, acted as a complexing agent of Ti(IV) ions to promote the growth of ellipsoidal particles of a low aspect ratio, rather than a shape controller to produce ellipsoids of a high aspect ratio. Sodium oleate and sodium stearate were found to modify the particle shape from round-cornered cubes to sharp-edged cubes. The mechanism was explained in terms of the reduction of the specific surface energies of the {001} and {100} planes of the tetragonal crystal system by the preferential adsorption of oleate or stearate ion onto these planes, based on the adsorption experiment using ellipsoidal and cubic particles. (C) 2003 Elsevier Science (USA). All rights reserved.
引用
收藏
页码:53 / 61
页数:9
相关论文
共 17 条
[1]  
[Anonymous], 1964, STABILITY CONSTANTS
[2]  
Martell AE, 1964, STABILITY CONSTANTS
[3]  
Perrin D. D., 1979, STABILITY CONSTANT B
[4]  
PESEZ M, 1974, CALORIMETRIC FLUORIM, P132
[5]   PREPARATION OF MONODISPERSE PSEUDOCUBIC ALPHA-FE2O3 PARTICLES FROM CONDENSED FERRIC HYDROXIDE GEL [J].
SUGIMOTO, T ;
SAKATA, K .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1992, 152 (02) :587-590
[6]   PREPARATION OF MONODISPERSE PEANUT-TYPE ALPHA-FE2O3 PARTICLES FROM CONDENSED FERRIC HYDROXIDE GEL [J].
SUGIMOTO, T ;
KHAN, MM ;
MURAMATSU, A .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1993, 70 (02) :167-169
[7]   Systematic control of size, shape and internal structure of monodisperse α-Fe2O3 particles [J].
Sugimoto, T ;
Wang, YS ;
Itoh, H ;
Muramatsu, A .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1998, 134 (03) :265-279
[8]   Formation mechanism of monodisperse CdS particles from concentrated solutions of Cd-EDTA complexes [J].
Sugimoto, T ;
Dirige, GE ;
Muramatsu, A .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1996, 182 (02) :444-456
[9]   Preparation of monodisperse platelet-type hematite particles from a highly condensed beta-FeOOH suspension [J].
Sugimoto, T ;
Waki, S ;
Itoh, H ;
Muramatsu, A .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1996, 109 :155-165
[10]   Synthesis of uniform anatase TiO2 nanoparticles by gel-sol method -: 1.: Solution chemistry of Ti(OH)n(4-n)+ complexes [J].
Sugimoto, T ;
Zhou, XP ;
Muramatsu, A .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2002, 252 (02) :339-346