Large-scale synthesis of TiO2 nanorods via nonhydrolytic sol-gel ester elimination reaction and their application to photocatalytic inactivation of E. coli
Large-scale synthesis of TiO2 nanorods via nonhydrolytic sol-gel ester elimination reaction and their application to photocatalytic inactivation of E. coli
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DOI：
10.1021/jp052458z
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发表时间：
2005-08-18
影响因子：
3.3
通讯作者：
Hyeon, T
中科院分区：
文献类型：
--
作者：
Joo, J;Kwon, SG;Hyeon, T
开发了一种合成大量 TiO2 纳米棒的简单方法。异丙醇钛 (IV) 和油酸在 270 摄氏度下发生非水解溶胶-凝胶反应，生成 3.4 nm（直径）x 38 nm（长度）尺寸的 TiO2 纳米晶体。透射电子显微镜图像显示颗粒具有均匀的直径分布。 X射线衍射和选区电子衍射图结合高分辨率透射电子显微镜图像表明，TiO2纳米棒是沿[001]方向生长的高度结晶的锐钛矿晶体结构。通过向反应混合物中添加 1-十六胺作为助表面活性剂来控制 TiO2 纳米棒的直径。使用 1、5 和 10 mmol 1-十六胺分别获得平均尺寸为 2.7 nm x 28 nm、2.2 nm x 32 nm 和 2.0 nm x 39 nm 的 TiO2 纳米棒。 TiO2纳米棒的光学吸收光谱显示，纳米棒在室温下的带隙为3.33 eV，比块体锐钛矿带隙（3.2 eV）大130 meV，证明了量子限域效应。通过油酸羧基的还原去除纳米棒表面配位的油酸，所得裸露TiO2纳米棒的Brunauer-Emmett-Teller表面积为198 m(2)/g。裸露的 TiO2 纳米棒对大肠杆菌的光催化灭活表现出比 P-25 光催化剂更高的光催化活性。
A simple method of synthesizing a large quantity of TiO2 nanorods was developed. A nonhydrolytic sol-gel reaction between titanium(IV) isopropoxide and oleic acid at 270 degrees C generated 3.4 nm (diameter) x 38 nm (length) sized TiO2 nanocrystals. The transmission electron microscopic image showed that the particles have a uniform diameter distribution. X-ray diffraction and selected-area electron diffraction patterns combined with high-resolution transmission electron microscopic image showed that the TiO2 nanorods are highly crystalline anatase crystal structure grown along the [001] direction. The diameters of the TiO2 nanorods were controlled by adding 1-hexadecylamine to the reaction mixture as a cosurfactant. TiO2 nanorods with average sizes of 2.7 nm x 28 nm, 2.2 nm x 32 nm, and 2.0 nm x 39 nm were obtained using 1, 5, and 10 mmol of 1-hexadecylamine, respectively. The optical absorption spectrum of the TiO2 nanorods exhibited that the band gap of the nanorods was 3.33 eV at room temperature, which is 130 meV larger than that of bulk anatase (3.2 eV), demonstrating the quantum confinement effect. Oleic acid coordinated on the nanorod surface was removed by the reduction of the carboxyl group of oleic acid, and the Brunauer-Emmett-Teller surface area of the resulting naked TiO2 nanorods was 198 m(2)/g. The naked TiO2 nanorods exhibited higher photocatalytic activity than the P-25 photocatalyst for the photocatalytic inactivation of E. coli.