Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, Key Laboratory for the 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.
Nano Lett. 2013;13(11):5666-71. doi: 10.1021/nl403336x. Epub 2013 Oct 25.
Chiral structure determination of single-walled carbon nanotube (SWNT), including its handedness and chiral index (n,m), has been regarded as an intractable issue for both fundamental research and practical application. For a given SWNT, the n and m values can be conveniently deduced if an arbitrary two of its three crucial structural parameters, that is, diameter d, chiral angle θ, and electron transition energy E(ii), are obtained. Here, we have demonstrated a novel approach to derive the (n,m) indices from the θ, d, and E(ii) of SWNTs. Handedness and θ were quickly measured based on the chirality-dependent alignment of SWNTs on graphite surface. By combining their measured d and E(ii), (n,m) indices of SWNTs can be independently and uniquely identified from the (θ,d) or (θ,E(ii)) plots, respectively. This approach offers intense practical merits of high-efficiency, low-cost, and simplicity.
单壁碳纳米管（SWNT）的手性结构确定，包括其手性和手性指数（n，m），一直被认为是基础研究和实际应用中的一个难题。对于给定的 SWNT，如果得到其三个关键结构参数中的任意两个，即直径 d、手性角θ和电子跃迁能量 E（ii），就可以方便地推断出 n 和 m 值。在这里，我们展示了一种从 SWNTs 的θ、d 和 E（ii）中推导出（n，m）指数的新方法。根据 SWNTs 在石墨表面上的手性依赖性排列，快速测量了手性和θ。通过结合它们测量的 d 和 E（ii），可以分别从（θ，d）或（θ，E（ii））图中独立且唯一地识别 SWNTs 的（n，m）指数。这种方法具有高效率、低成本和简单性的实际优点。
