本文报道了一种由TiOCl2液相直接合成金红石型TiO2纳米粒子的新方法,即微波诱导沸腾回流强迫水解法,用该法制备出常规条件下不能得到的产品.所得产物用粉末X射线衍射仪和透射电子显微镜表征,证明产物为金红石型,粒子尺寸5～30nm可控.研究表明,产物物相取决于Ti4+的初始水解速率,水解速率越快,越有利于金红石相成核;通过控制初始Ti4+的浓度,可改变纳米TiO2的粒径.另外还讨论了该金红石型TiO2纳米粒子的成核机理.
Rutile TiO2 nanoparticles of controled size were prepared by a very simple forced hydrolysis from TiOCl2 aqueous solution using microwave irradiation. The products were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The TiO2 particles produced from the present route have spherical structure. The influence of heating power on TiOCl2 solution hydrolytic process was studied and a possible nucleation mechanism of rutile TiO2 nanoparticles was discussed.
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