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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
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在非范德瓦尔斯二维材料中的厚度依赖的表面重建.

Kai Gao1, Yan-Jin Chen1, Yang Ou1

  • 1College of Rare Earths and Faculty of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China. atomy47@outlook.com.

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概括

表面的不完美和重建显著影响非范德瓦尔斯 (非vdW) 两维 (2D) 半导体,如比斯氧基化物. 这些因素导致这些新的二维材料具有独特的电子特性和厚度依赖的表面结构.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 表面科学是一门学科.

背景情况:

  • 石氧基化物 (Bi2O2X) 是非范德瓦尔斯 (非vdW) 二维 (2D) 半导体,在电子和光电子领域具有潜力.
  • 表面缺陷,如空缺和重建,在非vdW 2D 材料中比vdW 材料更为普遍.
  • 这些表面现象可以导致独特的物理性质和新的现象.

研究的目的:

  • 研究表面空隙和重建对Bi2O2X表面和2D结构的特性的影响.
  • 在不同的表面条件和厚度下探索这些非vdW 2D 材料的稳定性和电子特性.

主要方法:

  • 第一个原理计算被用来研究原子和电子结构.
  • 分析表面空隙二分化,电子结构耐受性和厚度依赖的表面重建.
  • 除能量的计算,以评估材料的制造易度.

主要成果:

  • 在Bi2O2S和Bi2O2Te (001) 表面中观察到表面X空位二元化.
  • Bi2O2X (001) 表面的电子结构对表面X空隙的排列表现出了显著的耐受性.
  • 确定了一种厚度依赖的表面重建:拉链表面对单层稳定,而二度表面则有利于更厚的薄膜.
  • 剥皮能量与常见的vdW 2D 材料相比较,这表明2D Bi2O2X.的制造容易.

结论:

  • 非vdW的2D材料,特别是木氧基化物,由于表面的不完美和重建,表现出有趣的特性.
  • 表面效应在决定这些材料的性能方面发挥着至关重要的作用,与VDW 2D 材料相比,它具有明显的优势.
  • 2D石氧基化物是有前途的,易于制造的材料,用于先进的电子和光电子应用.