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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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相关实验视频

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Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells
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单晶 SnO2 齐格扎格的纳米带.

Junhong Duan1, Shaoguang Yang, Hongwei Liu

  • 1National Laboratory of Microstructures, Nanjing University, Nanjing 210093, China.

Journal of the American Chemical Society
|April 28, 2005
PubMed
概括

研究人员用一种简单的蒸发方法合成了状的二氧化 (SnO2) 纳米带. 这一发现为创造先进的纳米结构材料提供了新的途径.

科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 固态化学 固态化学

背景情况:

  • 二氧化 (SnO2) 是一种半导体,具有多种应用.
  • 控制纳米结构形态对于调整材料特性至关重要.
  • 开发纳米带的新型合成方法是一个活跃的研究领域.

研究的目的:

  • 为了合成和表征曲的SnO2纳米带.
  • 为了研究曲形态的生长机制.
  • 探索新的纳米结构材料制备的潜力.

主要方法:

  • 锡粒在空气中的蒸发.
  • 用于相位分析的X射线衍射 (XRD).
  • 扫描电子显微镜 (SEM) 和传输电子显微镜 (TEM) 用于形态和结构.
  • 高分辨率TEM (HRTEM) 和选区电子衍射 (SAED) 用于结晶结构的确定.

主要成果:

  • 成功合成了循环的SnO2纳米带,具有周期形态.
  • XRD证实了纯四角形的SnO2阶段.
  • HRTEM和SAED揭示了一个单晶结构沿着曲的纳米带.

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  • 齐克扎克结构归因于相当的晶体轴之间生长方向的变化.

    • 结论:

    • 建立了一种合成旋式SnO2纳米带的新方法.
    • 增长机制涉及沿同等晶体平面的方向变化.
    • 这种方法为准备具有独特形态的新型纳米结构材料提供了新的途径.