从碳纳米管中的振动模式中选择直径的拉曼散射
1A. M. Rao and P. C. Eklund, Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, KY 40506-0055, USA. E. Richter, K. A. Williams, S. Fang, K. R. Subbaswamy, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA. S. Bandow, Instrument Center, Institute for Molecular Science, Myodaiji, Okazaki 444, Japan. B. Chase, Dupont Experimental Station, E328163, P.O. Box 80328, Wilmington, DE 19880-0328, USA. M. Menon, Department of Physics and Astronomy and Center for Computational Sciences, University of Kentucky, Lexington, KY 40506-0055, USA. A. Thess and R. E. Smalley, Department of Chemistry, Rice University, Houston, TX 77005, USA. G. Dresselhaus, Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. M. S. Dresselhaus, Department of Physics and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
拉曼光谱揭示了单壁碳纳米管 (SWNT) 中的振动模式. 格子动态计算和极化模型支持实验数据,表明量子束效应.
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
- 纳米技术 纳米技术
背景情况:
- 单壁碳纳米管 (SWNTs) 由于其一维结构,具有独特的特性.
- 了解它们的振动特性对于应用至关重要.
- SWNTs通常在密集的阵列中形成晶体绳.
研究的目的:
- 用拉曼散射来研究SWNTs的振动模式.
- 为了将实验拉曼光谱与理论模型相关联.
- 探索量子束对拉曼散射的影响.
主要方法:
- 拉曼散射光谱学,激发波长为514.5至1320 nm.
- 使用C-C力常数进行格子动态计算.
- 与石墨烯的试验声分散的比较.
- 不共振键极化模型的应用.
主要成果:
- 观察到许多拉曼峰值,并将其分配给扶手椅 (n,n) SWNTs的特定振动模式.
- 实验频谱与格子动态计算有很好的一致性.
- 从极化模型中计算的强度与拉曼数据在定性上一致.
- 鉴定了由于1D量子束引起的共振拉曼散射的证据.
结论:
- 拉曼光谱对于描述SWNT振动模式是有效的.
- 格子动态和极化模型为SWNT行为提供了宝贵的见解.
- 一维量子束显著影响SWNT中的共振拉曼散射过程.
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