Fachbereich Physik, Universität Osnabrück, Barbarastrasse 7, D-49076 Osnabrück, Germany.
Nanotechnology. 2009 Dec 16;20(50):505703. doi: 10.1088/0957-4484/20/50/505703. Epub 2009 Nov 19.
Non-contact atomic force microscopy (NC-AFM) at true atomic resolution is used to investigate the (110) surface of rutile TiO(2). We are able to simultaneously resolve both bridging oxygen and titanium atoms of this prototypical oxide surface. Furthermore, the characteristic defect species, i.e. bridging oxygen vacancies, single and double hydroxyls as well as subsurface defects, are identified in the very same frame. We employ density functional theory (DFT) calculations to obtain a comprehensive understanding of the relation between the tip apex structure and the observed image contrast. Our results provide insight into the physical mechanisms behind atomic-scale contrast, indicating that electrostatic interaction can lead to a far more complex contrast than commonly assumed.
使用真原子分辨率的非接触原子力显微镜（NC-AFM）来研究金红石 TiO(2)的（110）表面。我们能够同时分辨出这种典型氧化物表面的桥氧和钛原子。此外，在同一个框架中还可以识别出特征缺陷物种，即桥氧空位、单羟基和双羟基以及亚表面缺陷。我们采用密度泛函理论（DFT）计算来全面了解针尖尖端结构和观察到的图像对比度之间的关系。我们的结果深入了解了原子尺度对比度背后的物理机制，表明静电相互作用可以导致比通常假设的更为复杂的对比度。
