Research Institute for Electromagnetic Materials, Sendai 982-0807, Japan.
Nanoscale Res Lett. 2013 Jun 7;8(1):269. doi: 10.1186/1556-276X-8-269.
This study investigates the preparation of InSb-added TiO2 nanocomposite films by RF sputtering. The optical absorption spectra are obviously shifted to visible and near-infrared regions. High-resolution transmission electron microscopy indicates that sphere-shaped InSb nanocrystals with a size of about 15 nm are dispersed in a matrix. The X-ray diffraction result reveals that the matrix forms a phase mixture of TiO2 and In2O3, which is also produced by decomposing the InSb during postannealing at 723 K. Therefore, the absorption shift is clearly due to quantum size effects of the InSb nanocrystals embedded in the wide-gap oxides TiO2 and In2O3.
本研究通过射频溅射法制备了掺 InSb 的 TiO2 纳米复合薄膜。光学吸收光谱明显向可见光和近红外区域移动。高分辨率透射电子显微镜表明，约 15nm 大小的球形 InSb 纳米晶分散在基体中。X 射线衍射结果表明，基体形成了 TiO2 和 In2O3 的相混合物，这也是在 723K 后退火过程中 InSb 分解产生的。因此，吸收位移显然是由于嵌入宽禁带氧化物 TiO2 和 In2O3 中的 InSb 纳米晶的量子尺寸效应引起的。
