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Updated: Jul 12, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

在激光喷涂石墨时,污染驱动的形形成.

D J Krajnovich, J E Vázquez, R J Savoy

    Science (New York, N.Y.)
    |March 12, 1993
    PubMed
    概括

    石墨的激光喷射会以高能量喷射出碳原子,在表面形成圆和圆顶. 微量金属杂质通过在异性质材料中充当热分流器来启动形形成.

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    科学领域:

    • 材料科学 材料科学 材料科学
    • 表面科学是一门学科.
    • 激光与材料的相互作用

    背景情况:

    • 高度定向的烧解石墨 (HOPG) 是一种具有独特性质的异性质材料.
    • 激光喷雾是一种用于材料去除和表面修饰的工艺.
    • 了解材料喷射机制和激光照射下的表面演变对于各种应用至关重要.

    研究的目的:

    • 用248纳米激光辐射研究HOPG的喷射.
    • 描述被射出中性碳物种的转换能量.
    • 为了分析HOPG上所产生的表面形态变化.

    主要方法:

    • 用248纳米激光脉冲对HOPG进行辐射.
    • 抛出中性碳原子和小集群的分析.
    • 使用显微镜技术表征表面形态.

    主要成果:

    • 中性碳原子和有意想不到的高转化能量的集群的喷射.
    • 形成了独特的表面形态,其特点是有规律的圆和圆顶.
    • 识别微量金属杂质作为通过热分流启动形的启动者.

    结论:

    • 由于喷出物种的高动能,HOPG的激光喷射与简单的热蒸发模型有所不同.
    • 表面形态演变,包括形形成,受到作为热通道的微量杂质的显著影响.
    • 该研究提供了关于激光诱导材料修饰和异性质材料表面结构的见解.

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