Optical Properties of Single-Wall Carbon Nanotubes

单壁碳纳米管的光学性质

• 批准号: 07640432
• 负责人: KASUYA Atsuo
• 金额: $ 1.6万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640432/
• 关键词: nanotube; carbon cluster; raman scattering; graphite; クラスター; アーク放電

Raman scattering spectra of single-wall nanotubes with mean radii 0.55,0.65 and 1.0 nm show size-dependent multiple splittings of the optical phonon peak corresponding to E_<2g> mode in graphite. These splittings constitute the first experimental evidence for the unique feature of nanotubes that they exhibit discrete and diameter-dependent dispersions arising from their cylindrical symmetry. The observed dispersion is well explained on the basis of graphite, and shows possibilities of predicting and controlling the basic property of nanotubes in the zone-folding scheme.Resonant Raman scattering from optical phonons in single-wall nanotubes of mean diamater 1.1 nm has been measured in the wavelength of incident laser beam between 450 nm and 800 nm. The scattering intensities exhibit anomalies in the vicinity of 690 nm, being a minimum in the longitudinal components and a maximum in the transverse. Our optical transmission measurement also exhibits a dip in the same photon energy range. The anomalies are caused by the incident laser beam resonant with the zone-folded electronic structures in nanotubes. These results constitute a direct experimental evidence of the critical point in the density of ststes produced by the cylindrical symmetry of nanotubes.

平均半径为0.55、0.65和1.0 nm的单壁纳米管的拉曼散射光谱显示，石墨中E_<2g>模式对应的光学声子峰出现了与尺寸相关的多次分裂。这些分裂构成了纳米管独特特征的第一个实验证据，即它们表现出离散的和直径相关的分散，这是由于它们的圆柱形对称性引起的。在石墨的基础上很好地解释了所观察到的分散，并显示了在区域折叠方案中预测和控制纳米管基本性质的可能性。测量了平均直径为1.1 nm的单壁纳米管中光学声子在入射激光波长450 ~ 800 nm范围内的共振拉曼散射。散射强度在690 nm附近表现出异常，在纵向分量中最小，在横向分量中最大。我们的光透射测量也显示出在相同光子能量范围内的下降。这些异常是由入射的激光束与纳米管中的区域折叠电子结构共振引起的。这些结果构成了纳米管圆柱对称产生的应力密度临界点的直接实验证据。

项目成果

S.Suto: "Vibrational Properties and Structure of C_<60> Thin Films on Si(111)-(7×7) and Graphite Surface." Surface Review and Letters.3.1. 927-931 (1996)

S.Suto：“Si(111)-(7×7) 和石墨表面上的 C_<60> 薄膜的振动特性和结构。表面评论和快报。3.1 (1996)”

K.Tohji: "Purification Procedure for Single-Walled Nanotubes" Journal of Physical Chemistry. 101. 1974-1978 (1997)

K.Tohji：“单壁纳米管的纯化程序”物理化学杂志。

R.Czajka: "Formation and Modification of Mesoscopic Structures on Graphite (HOPG) and Silicon Surfaces by Means of Scanning tunneling Microscopy" Surface Review and Letters. 3, No.1. 961-967 (1996)

R.Czajka：“通过扫描隧道显微镜形成和修改石墨（HOPG）和硅表面介观结构”表面评论和快报。

A.Kasuya: "Neutron Irradiation on Carbon Nanocapsules" Materials Science and Engineering. A217/218. 50-53 (1996)

A.Kasuya：“中子辐照碳纳米胶囊”材料科学与工程。

K.Tohji: "Purifying Single-Walled Nanotubes" Nature. 383. 679-670 (1996)

K.Tohji：“净化单壁纳米管”自然。