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首页> 外文期刊>Nanotechnology >Role of tip apices in scanning force spectroscopy on alkali halides at room temperature-chemical nature of the tip apex and atomic-scale deformations
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Role of tip apices in scanning force spectroscopy on alkali halides at room temperature-chemical nature of the tip apex and atomic-scale deformations

机译：尖端Apices在扫描力光谱对碱温度 - 化学性质的扫描力光谱对尖端顶点和原子尺度变形的作用

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摘要

We have revealed processes of the tip apex distortion in the measurements of non-contact scanning force microscopy. High-spatial-resolution two-dimensional force mapping on KCl(100) surfaces for a large number of tips, seven tips, enabled us to see the complex behavior of the tip apex distortion. The tips are from Si without additional coating, but are altered by the tip-sample interaction and show the behavior of different atomic species. On the KCl(001) surfaces, the tip apex, consisting of K and Cl atoms or of Si, distorted several times while changing the distance even in a weak attractive region. There are variations in rigidity of the tip apex, but all tips distorted in the small attractive region. This complex behavior was categorized in patterns by our analyses. We compare the experimental force-distance data to atomistic simulations using rigid KCl-terminated tips and KCl-terminated tips with an additional KCl-pair designed to perform atomic jumps. We also compare the experimental force-distance data to first principles simulations using Si tips. We mainly find K-terminated tips and Si-terminated tips. We find that Si tips show only one force minimum whereas KCl-terminated tips show two force minima in line with the stronger rigidity of Si compared to KCl. At room temperature, the tip apex atoms can perform atomic jumps that change the atomic configuration of the tip apex.
机译：在非接触式扫描力显微镜的测量中，我们揭示了针尖变形的过程。在KCl（100）表面上绘制大量尖端（七个尖端）的高空间分辨率二维力图，使我们能够看到尖端尖端畸变的复杂行为。针尖由Si制成，无需额外涂层，但会因针尖-样品相互作用而改变，并显示出不同原子物种的行为。在KCl（001）表面上，由K和Cl原子或Si组成的尖端顶点在改变距离的同时发生了多次扭曲，即使在弱吸引区也是如此。叶尖顶点的硬度存在差异，但所有叶尖都在小的吸引区域内扭曲。通过我们的分析，这种复杂的行为被归类为模式。我们将实验力-距离数据与原子模拟进行了比较，使用刚性KCl端接尖端和KCl端接尖端，以及设计用于执行原子跳跃的额外KCl对。我们还将实验力-距离数据与使用Si tips的第一原理模拟进行了比较。我们主要发现K端和Si端的尖端。我们发现，与KCl相比，Si端头仅显示一个力最小值，而KCl端头显示两个力最小值，这与Si的刚性更强一致。在室温下，尖端顶点原子可以执行原子跳跃，从而改变尖端顶点的原子结构。

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