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小直径的纳米线表面.

D D D Ma1, C S Lee, F C K Au

  • 1Center of Super-Diamond and Advanced Films and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China.

Science (New York, N.Y.)
|February 22, 2003
PubMed
概括

研究人员创建了终结纳米线 (SiNWs),具有增强的氧化抵抗. 它们的电子特性,包括能量差距,随直径而变化,与这些新型纳米材料的理论预测保持一致.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 表面科学是一门学科.

背景情况:

  • 纳米线 (SiNWs) 在纳米电子学中至关重要.
  • 表面氧化限制了SiNWs的稳定性和性能.
  • 了解表面终结是控制SiNW属性的关键.

研究的目的:

  • 为了准备和描述终结SiNWs.
  • 为了研究这些SiNW表面的氧化阻力.
  • 为了确定SiNW直径和电子能量差距之间的关系.

主要方法:

  • 小直径SiNWs (1-7nm) 的制备.
  • 酸处理以去除氧化物和终端表面.
  • 扫描道显微镜 (STM) 和光谱 (STS) 在空气和超高真空中.

主要成果:

  • 原子分辨率的STM图像证实了终点 (Si111-Si1x1) 和Si001-Si1x1).
  • 与晶片相比,用终结的SiNWs表现出优越的氧化抵抗力.
  • 电子能量差距从1.1 eV (7 nm) 增加到3.5 eV (1.3 nm),直径减少.

结论:

  • 终结为SiNWs提供了显著的氧化抵抗.
  • SiNW直径强烈影响电子带结构,特别是能量差距.
  • 这些发现支持在先进的电子应用中使用终结SiNWs.

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