Contrast inversion of O adatom on rutile TiO₂(110)-(1 x 1) surface by atomic force microscopy imaging
Contrast inversion of O adatom on rutile TiO₂(110)-(1 x 1) surface by atomic force microscopy imaging
复制标题
通过原子力显微镜成像对金红石 TiO·(110)-(1 x 1) 表面上的 O 吸附原子进行对比度反转
DOI：
10.1016/j.apsusc.2019.144623
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发表时间：
2020
影响因子：
6.7
通讯作者：
Yan Jun Li
中科院分区：
文献类型：
--
作者：
Huan Fei Wen;Quan Zhen Zhang;Adachi Yuuki;Miyazaki Masato;Sugawara Yasuhiro;Yan Jun Li
通过原子力显微镜（AFM）以原子分辨率对金红石TiO2（110）-（1×1）表面上的氧吸附原子进行成像。氧吸附原子的原子对比度反转取决于尖端-样品距离，并且可以在恒定频移和恒定高度模式下获得。结合吸附物质、反馈回路和尖端结构的影响，分析了对比度反转的根源。绕O吸附原子的实验频移与距离曲线表明，在恒定频移模式下存在转折点，在恒定高度模式下存在交叉点。排斥力被认为有助于氧吸附原子的反差反转。本结果显示了金红石TiO2(110)-(1×1)表面上氧吸附原子对比度反转的起源，并说明了尖端高度对于金属氧化物表面上表面吸附物原子对比度反转的重要性。
Oxygen adatom on rutile TiO2(1 1 0)-(1 × 1) surface was imaged by atomic force microscopy (AFM) with atomic resolution. The atomic contrast inversion of oxygen adatom is dependent on tip-sample distance and can be obtained in both constant frequency shift and constant height mode. The origin of contrast inversion was analyzed, combining the effect of adsorbed species, feedback loop and tip apex structure. Experimental frequency shift versus distance curves around O adatom show that there is a turning-point in the constant frequency shift mode and a cross-point in the constant height mode. The repulsive force is thought to contribute to the contrast inversion of oxygen adatom. The present results show the origin of contrast inversion of oxygen adatom on rutile TiO2(1 1 0)-(1 × 1) surface and illustrate the importance of tip-height for the atomic contrast inversion of the surface adsorbate on the metal oxide surface.