Imaging patterns of anatase TiO2(001) with non-contact atomic force microscopy
Imaging patterns of anatase TiO2(001) with non-contact atomic force microscopy
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DOI：
10.1088/1361-6528/ab02a7
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发表时间：
2019-03
期刊：
影响因子：
3.5
通讯作者：
Daiki Katsube;M. Abe
中科院分区：
文献类型：
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作者：
Daiki Katsube;M. Abe
利用非接触式原子力显微镜（NC-AFM）观察了纳米TiO 2（001）的形貌。NC-AFM与脉冲激光沉积，扫描隧道显微镜（STM）和低能电子衍射（LEED）的组合系统使我们能够制备清洁的表面的TiO 2薄膜，并对它们进行测量，而不破坏真空或清洁表面的溅射和退火周期的需要。STM和LEED的结果表明，纳米TiO 2（001）薄膜具有（1 × 4）的表面结构。在远距离，其中的频移是相对较小的，NC-AFM图像显示三种不同的模式（标记为突起，孔，和中性对比度，分别）类似于那些已经报道的金红石型TiO 2表面的研究。在较近的尖端样品的距离，观察到与TiO 2晶格常数一致的周期性图案沿沿着较高位置的TiO 3行。我们还观察到，能量耗散仅与铂尖诱导，而不是与其他尖顶点。
Image patterns of anatase TiO2(001) with non-contact atomic force microscopy (NC-AFM) are presented. A combined system of NC-AFM with pulsed laser deposition, scanning tunneling microscopy (STM), and low energy electron diffraction (LEED) enables us to prepare clean surfaces of anatase TiO2 thin films and to perform measurements on them without breaking the vacuum or the need of cleaning the surface with sputtering and annealing cycles. Results from STM and LEED show that the anatase TiO2(001) films display a (1 × 4) surface pattern of row structures. At far distances, in which the frequency shift was relatively small, NC-AFM images show three different patterns (labeled as protrusion, hole, and neutral contrast, respectively) similar to the ones that have been reported before in the studies of the rutile TiO2 surface. At closer tip-sample distances, a periodic pattern consistent with the TiO2 lattice constant was observed along the higher-positioned TiO3 rows. We have also observed that energy dissipation is induced only with platinum tips, and not with other tip apexes.