Nanosystem Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
J Am Chem Soc. 2011 Nov 30;133(47):19102-9. doi: 10.1021/ja2049463. Epub 2011 Nov 3.
A general synthesis of inorganic single-crystalline hollow spheres has been achieved through a mechanism analogous to the Kirkendall effect, based on a simple one-step laser process performed at room temperature. Taking TiO(2) as an example, we describe the laser process by investigating the influence of experimental parameters, for example, laser wavelength, laser fluence/irradiation time, liquid medium, and concentration of starting materials, on the formation of hollow spheres. It was found that the size-tailored TiO(2) hollow spheres demonstrate tunable light scattering over a wide visible-light range. Inspired by the effect of light scattering, we introduced the TiO(2) hollow sphere's scattering layer in quantum dot-sensitized solar cells and achieved a current notable 10% improvement of solar-to-electric conversion efficiency, indicating that TiO(2) hollow spheres are potential candidates in optical and optoelectronic devices.
通过类似于 Kirkendall 效应的机制，我们实现了一种通用的无机单晶空心球的合成方法，该方法基于在室温下进行的简单一步激光工艺。以 TiO(2) 为例，我们通过研究实验参数（例如激光波长、激光能量密度/辐照时间、液体介质和起始材料浓度）对空心球形成的影响来描述激光工艺。结果表明，尺寸可调的 TiO(2)空心球在宽可见光范围内具有可调谐的光散射。受光散射效应的启发，我们在量子点敏化太阳能电池中引入了 TiO(2)空心球的散射层，实现了太阳能到电能转换效率的显著提高（提高了 10%），这表明 TiO(2)空心球是光学和光电设备中有前途的候选材料。
