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首页> 外文期刊>Journal of Vacuum Science & Technology >Characterization of focused-ion-beam induced defect structures in graphite for the future guided self-assembly of molecules
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Characterization of focused-ion-beam induced defect structures in graphite for the future guided self-assembly of molecules

机译：聚焦离子束诱导的石墨中缺陷结构的表征，用于将来分子的自组装

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摘要

The morphology and periodicity of arrays of single focused-ion-beam induced artificial defects in graphite is probed using scanning tunneling microscopy and modeled through Monte Carlo simulation. While ion dose is kept constant with a fluence of 2.48 × 10~(15) ions cm~(-2), variations in artificial defect morphology are attributed to astigmatism in the beam aperture, to deviation in beam angle, or to distance from beam focal point. Simulation of the collision cascade of the ion in graphite lattice correlates to the artificial defect dimensions of both circular symmetric and elongated asymmetric defects. Periodic arrays of artificial defects exhibit constant periodicities at lower basis dimensions (100 nm separation between defects), with larger deviations from the periodic structure at higher basis dimensions (400 nm separation between defects). Well structured periodic arrays of defects are considered for nanostructured patterning of molecules for thin film growth. Local amorphization of graphite due to ion irradiation changes the diffusion field, which can be tailored for the guided self-assembly of molecules.
机译：使用扫描隧道显微镜探测石墨中的单个聚焦离子束诱导的人工缺陷阵列的形态和周期性，并通过蒙特卡洛模拟进行建模。当离子剂量以2.48×10〜（15）离子cm〜（-2）的通量保持恒定时，人工缺陷形态的变化归因于束孔径的像散，束角的偏差或与束的距离焦点。石墨晶格中离子碰撞级联的模拟与圆形对称缺陷和细长非对称缺陷的人工缺陷尺寸相关。人工缺陷的周期性阵列在较低的基础尺寸（缺陷之间的100 nm间距）下显示出恒定的周期性，而在较高的基础尺寸（缺陷之间的400 nm间距）下，与周期性结构的偏差较大。缺陷的结构良好的周期性阵列被认为是用于薄膜生长的分子的纳米结构化图案。由于离子辐照引起的石墨局部非晶化改变了扩散场，可以针对分子的引导自组装进行定制。

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  • 来源
    《Journal of Vacuum Science & Technology》 |2009年第5期|2209-2216|共8页
  • 作者

    Sarah E. ODonnell; Petra Reinke;

  • 作者单位

    The MITRE Corporation, McLean, Virginia 22102;

    University of Virginia, Charlottesville, Virginia 22904;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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