...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Surface and Interface Analysis: SIA: An International Journal Devoted to the Development and Application of Techniques for the Analysis of Surfaces, Interfaces and Thin Films >Computer simulation of the AFM/LFM imaging process: Hexagonal versus honeycomb structure on graphite
【24h】

Computer simulation of the AFM/LFM imaging process: Hexagonal versus honeycomb structure on graphite

机译：AFM / LFM成像过程的计算机模拟：石墨上的六角形与蜂窝结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Although the atoms in cleavage planes of graphite are arranged in a honeycomb structure, it is well known from experimental work that atomic force microscopy (AFM) yields a hexagonal structure, a phenomenon that has not been understood so far. Here, computer simulations of the atomic-scale imaging process on graphite by AFM are reported, showing that this behaviour can be explained within a simple model of elastic tip-sample interaction. Both the topographic (AFM) images and the friction force or lateral force microscopy (LFM) images were simulated as a function of the scanning direction relative to the graphite lattice and as a function of the cantilever force constant. The scan distortions and the skipped area due to the AFM/LFM imaging process were evaluated. Simulations were performed both in the presence and in the absence of atomic-scale stick-slip processes. It is shown that neither stick-slip processes nor an inequivalence of the A- and B-sites of graphite is necessary to generate a hexagonal AFM image when scanning an atomic honeycomb structure. Rather, the simulations demonstrate that due to the two-dimensional elastic lateral displacement of the cantilever, the potential maxima - which correspond to the positions of the honeycomb lattice - are avoided by the scanning path of the tip apex, resulting in a hexagonal structure of the APM and LFM images. (C) 1997 by John Wiley & Sons, Ltd.
机译：尽管石墨的裂解平面中的原子排列成蜂窝结构，但从实验工作中众所周知，原子力显微镜（AFM）产生六边形结构，这种现象到目前为止还没有被理解。在此，报道了通过原子力显微镜对石墨进行原子级成像过程的计算机模拟，表明该行为可以在弹性尖端-样品相互作用的简单模型中得到解释。地形图（AFM）图像和摩擦力或横向力显微镜（LFM）图像均根据相对于石墨晶格的扫描方向以及悬臂力常数进行了模拟。评估了由于AFM / LFM成像过程而引起的扫描失真和跳过区域。在存在和不存在原子级粘滑过程的情况下均进行了仿真。结果表明，扫描原子蜂窝结构时，既不需要粘滑过程也不需要石墨的A和B位点不等价即可生成六边形AFM图像。相反，仿真表明，由于悬臂的二维弹性侧向位移，尖端顶点的扫描路径避免了对应于蜂窝晶格位置的电势最大值，从而形成了六边形结构。 APM和LFM图像。 （C）1997年，John Wiley＆Sons，Ltd.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号