Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, Key Laboratory for Physics and Chemistry of Nanodevices, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Nat Commun. 2013;4:2205. doi: 10.1038/ncomms3205.
Aligned single-walled carbon nanotube arrays provide a great potential for the carbon-based nanodevices and circuit integration. Aligning single-walled carbon nanotubes with selected helicities and identifying their helical structures remain a daunting issue. The widely used gas-directed and surface-directed growth modes generally suffer the drawbacks of mixed and unknown helicities of the aligned single-walled carbon nanotubes. Here we develop a rational approach to anchor the single-walled carbon nanotubes on graphite surfaces, on which the orientation of each single-walled carbon nanotube sensitively depends on its helical angle and handedness. This approach can be exploited to conveniently measure both the helical angle and handedness of the single-walled carbon nanotube simultaneously at a low cost. In addition, by combining with the resonant Raman spectroscopy, the (n,m) index of anchored single-walled carbon nanotube can be further determined from the (d,θ) plot, and the assigned (n,m) values by this approach are validated by both the electronic transition energy Eii measurement and nanodevice application.
排列整齐的单壁碳纳米管阵列为基于碳的纳米器件和电路集成提供了巨大的潜力。然而，排列整齐的单壁碳纳米管的特定螺旋手性的选择和识别仍然是一个艰巨的问题。广泛使用的气体导向和表面导向生长模式通常存在排列整齐的单壁碳纳米管的螺旋手性混合且未知的缺点。在这里，我们开发了一种在石墨表面固定单壁碳纳米管的合理方法，其中每个单壁碳纳米管的方向敏感地取决于其螺旋角和手性。这种方法可以以较低的成本方便地同时测量单壁碳纳米管的螺旋角和手性。此外，通过与共振拉曼光谱相结合，从（d，θ）图中可以进一步确定固定单壁碳纳米管的（n，m）指数，并且通过这种方法分配的（n，m）值通过电子跃迁能量 Eii 测量和纳米器件应用得到验证。
