State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, PR China.
Ultrason Sonochem. 2011 Sep;18(5):1082-90. doi: 10.1016/j.ultsonch.2011.03.021. Epub 2011 Apr 8.
Using ultrasonication we succeed in a controlled incorporation of TiO(2) nanoparticles on the graphene layers homogeneously in a few hours. The average size of the TiO(2) nanoparticles was controlled at around 4-5 nm on the sheets without using any surfactant, which is attributed to the pyrolysis and condensation of the dissolved TiCl(4) into TiO(2) by ultrasonic waves. The photocatalytic activity of the resultant graphene-TiO(2) composites containing 25 wt.% TiO(2) is better than that of commercial pure TiO(2). This is partly due to the extremely small size of the TiO(2) nanoparticles and partly due to the graphene-TiO(2) composite structure consisting of homogeneous dispersion of crystalline TiO(2) nanoparticles on the graphene sheets. As the graphene in the composites has a very good contact with the TiO(2) nanoparticles it enhances the photo-electron conversion of TiO(2) by reducing the recombination of photo-generated electron-hole pairs.
使用超声处理，我们成功地在几个小时内将 TiO(2) 纳米粒子均匀地掺入到石墨烯层中，实现了可控的掺入。在没有使用任何表面活性剂的情况下，纳米片上 TiO(2) 纳米粒子的平均尺寸控制在 4-5nm 左右，这归因于溶解的 TiCl(4) 在超声波作用下热解和缩合生成了 TiO(2)。含有 25wt.%TiO(2)的所得石墨烯-TiO(2)复合材料的光催化活性优于商业纯 TiO(2)。这部分是由于 TiO(2)纳米粒子的尺寸极小，部分是由于石墨烯-TiO(2)复合材料结构由均匀分散在石墨烯片上的结晶 TiO(2)纳米粒子组成。由于复合材料中的石墨烯与 TiO(2)纳米粒子具有非常好的接触，它通过减少光生电子-空穴对的复合来增强 TiO(2)的光电电子转换。
