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On the kinetic barriers of graphene homo-epitaxy

机译:关于石墨烯均质外延的动力学障碍

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摘要

The diffusion processes and kinetic barriers of individual carbon adatoms and clusters on graphene surfaces are investigated to provide fundamental understanding of the physics governing epitaxial growth of multilayer graphene. It is found that individual carbon adatoms form bonds with the underlying graphene whereas the interaction between graphene and carbon clusters, consisting of 6 atoms or more, is very weak being van der Waals in nature. Therefore, small carbon clusters are quite mobile on the graphene surfaces and the diffusion barrier is negligibly small (∼6 meV). This suggests the feasibility of high-quality graphene epitaxial growth at very low growth temperatures with small carbon clusters (e.g., hexagons) as carbon source. We propose that the growth mode is totally different from 3-dimensional bulk materials with the surface mobility of carbon hexagons being the highest over graphene surfaces that gradually decreases with further increase in cluster size.
机译:研究了石墨烯表面上单个碳原子和团簇的扩散过程和动力学势垒,以提供对控制多层石墨烯外延生长的物理学的基本理解。发现单个碳原子与下面的石墨烯形成键,而石墨烯与由6个或更多原子组成的碳簇之间的相互作用非常弱,本质上是范德华力。因此,小的碳簇在石墨烯表面上很容易移动,并且扩散势垒很小(〜6 meV)。这表明在非常低的生长温度下以小碳簇(例如六边形)作为碳源的高质量石墨烯外延生长的可行性。我们提出生长方式与3维块状材料完全不同,碳六边形的表面迁移率在石墨烯表面上最高,随着团簇尺寸的进一步增加逐渐降低。

著录项

  • 来源
    《Applied Physics Letters》 |2014年第22期|1-5|共5页
  • 作者单位

    Department of Materials Science & Engineering, University of California Los Angeles, Los Angeles, California 90095, USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 13:10:38

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