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.

中文翻译：

---

石墨上螺旋度相关的单壁碳纳米管排列，用于螺旋角和旋向识别。

对齐的单壁碳纳米管阵列为碳基纳米器件和电路集成提供了巨大的潜力。将单壁碳纳米管与选定的螺旋对齐并确定它们的螺旋结构仍然是一个令人生畏的问题。广泛使用的气体导向和表面导向生长模式通常具有排列的单壁碳纳米管的混合和未知螺旋度的缺点。在这里，我们开发了一种将单壁碳纳米管固定在石墨表面上的合理方法，每个单壁碳纳米管的取向敏感地取决于其螺旋角和旋向性。这种方法可用于以低成本同时方便地测量单壁碳纳米管的螺旋角和旋向性。此外，