用X射线衍射分析对单壁,双壁和少壁碳纳米管的宏观壁数分析
Don N Futaba1, Takeo Yamada, Kazufumi Kobashi
1Nanotube Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan. d-futaba@aist.go.jp
Journal of the American Chemical Society
|March 29, 2011
概括
一种新的X射线衍射方法确定了碳纳米管 (CNT) 的平均壁数. 这种宏观技术提供了一种更简单的电子显微镜替代方案,用于分析少壁的CNT.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 固态物理 固态物理
背景情况:
- 碳纳米管 (CNT) 和石墨烯等纳米碳材料的层次数对于其性能至关重要.
- 评估少层石墨烯很简单,但分析CNT通常需要传输电子显微镜.
- 需要更简单,宏观的方法来确定CNT的壁数.
研究的目的:
- 开发一种简单的,宏观的方法来确定碳纳米管 (CNTs) 的平均壁数.
- 建立适用于单壁或少壁CNT的技术,克服现有方法的局限性.
主要方法:
- 使用X射线衍射 (XRD) 并将焦点放在 (002) 峰上.
- 将 (002) XRD峰值分解为管内结构 (外壁接触) 和管内结构 (同心) 的贡献.
- 分析平均墙壁数量与管间到管内峰值贡献的比率之间的线性关系.
主要成果:
- CNTs的 (002) X射线衍射峰可以成功地分解为管间和管内结构部件.
- 确定了平均CNT壁数和这些管间和管内贡献的比率之间的线性相关性.
- 该方法对CNTs表现出良好的一致性,平均墙壁数从1到大约5.
结论:
- 一种简单的宏观X射线衍射方法已经开发出来,用于评估CNT的平均壁数.
- 这种技术为电子显微镜提供了可行的替代方案,用于分析单壁或少壁碳纳米管.
- 这些发现为纳米碳材料的表征提供了一个新的工具.
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