Rayleigh scattering studies on inter-layer interactions in structure-defined individual double-wall carbon nanotubes
Rayleigh scattering studies on inter-layer interactions in structure-defined individual double-wall carbon nanotubes
复制标题
DOI：
10.1007/s12274-014-0515-y
复制
发表时间：
2014-08
期刊：
影响因子：
9.9
通讯作者：
Sihan Zhao;Tomoya Kitagawa;Y. Miyauchi;K. Matsuda;H. Shinohara;R. Kitaura
中科院分区：
文献类型：
--
作者：
Sihan Zhao;Tomoya Kitagawa;Y. Miyauchi;K. Matsuda;H. Shinohara;R. Kitaura
尽管层状材料中的层间耦合由于其在确定二维系统物理性质方面的重要性而引起了人们极大的兴趣，但迄今为止对一维系统中层间耦合的研究还很有限。双壁碳纳米管（DWCNT）是研究一维系统中层间耦合最基本、最理想的模型系统之一。在这项工作中，瑞利散射光谱和透射电子显微镜用于表征完全相同的单个 DWCNT 的内部和外部纳米管之间的电子跃迁。我们发现，与孤立的碳纳米管相比，层间耦合很强，导致大多数光学跃迁能量下降（高达〜0.2 eV）。我们还发现金属管的存在会导致更强的转变。库仑相互作用的层间筛选是解释观察到的结果的关键因素之一。
Although the inter-layer coupling in layered materials has attracted considerable interest due to its importance in determining physical properties of two-dimensional systems, studies on the inter-layer coupling in one-dimensional systems have so far been limited. Double-wall carbon nanotubes (DWCNTs) are one of the most fundamental and ideal model systems to study the inter-layer coupling in one-dimensional systems. In this work, Rayleigh scattering spectroscopy and transmission electron microscopy are used to characterize the electronic transition between inner-and outer-nanotubes of the exactly same individual DWCNT. We find that the inter-layer coupling is strong, leading to downshifts in most of the optical transition energies (up to ∼0.2 eV) compared to isolated CNTs. We also find that the presence of metallic tubes lead to stronger shifts. The inter-layer screening of Coulomb interactions is one of the key factors in explaining the observed results.