以氢气、氧气和四氯化钛为混合前驱体,通过气液爆轰法合成了多晶纳米二氧化钛.研究了不同摩尔比例的前驱体和初始反应压力对纳米二氧化钛晶相结构的影响.采用X射线衍射及透射电子显微镜对产物的纳米结构、成分、颗粒大小和形态进行了表征.结果 表明:获得的二氧化钛存在纯净的锐钛矿相、纯净的金红石相和混合相,其中混合相的球形或者类球形颗粒粒径为20～150 nm.分析了纳米二氧化钛在气液爆轰中的形成机制.基于C-J理论和化学反应数据,计算了爆轰参数;该参数验证了不同摩尔比例的前驱体和初始反应压力对控制合成多晶纳米二氧化钛的影响.“,”The polycrystalline nano-TiO2 was synthesized by the gaseous-liquid detonation (GLD) method using H2,O2,and TiCl4 as the mixture precursors.The effects of different molar ratios of precursors and initial reaction pressures on the nano-TiO2 crystalline structures were studied.The nanocrystal structures,components,particle size,and morphology were characterized by the X-ray diffraction (XRD) and transmission electron microscopy (TEM).The results demonstrate that the nano-TiO2 consists of pure anatase-TiO2,pure rutile-TiO2,and the mixtures of spherical or quasi-spherical morphologies with particle size of 20～150 nm.Furthermore,the formation mechanism of nano-TiO2 by GLD method was analyzed.The relevant GLD parameters were calculated based on the C-J theory and the related chemical reaction data,which effectively verifies the influence of different molar ratios of precursors and initial pressures on the controllable synthesis of polycrystalline nano-TiO2.