Adsorption effects on radial breathing mode of single-walled carbon nanotubes

被引：31

作者：

Chiashi, Shohei ^{[1
,2
]}

Kono, Kaname ^{[3
]}

Matsumoto, Daiki ^{[3
]}

Shitaba, Junpei ^{[3
]}

Homma, Naoki ^{[3
]}

Beniya, Atsushi ^{[3
]}

Yamamoto, Takahiro ^{[1
,4
,5
]}

Homma, Yoshikazu ^{[1
,3
]}

机构：

[1] Tokyo Univ Sci, Nanocarbon Res Div, Shinjuku Ku, Tokyo 1628601, Japan

[2] Univ Tokyo, Dept Mech Engn, Bunkyo Ku, Tokyo 1138656, Japan

[3] Tokyo Univ Sci, Dept Phys, Shinjuku Ku, Tokyo 1628601, Japan

[4] Tokyo Univ Sci, Fac Engn, Dept Liberal Arts, Tokyo 1258585, Japan

[5] Tokyo Univ Sci, Grad Sch Engn, Dept Elect Engn, Tokyo 1258585, Japan

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 15期

关键词：

RAMAN-SCATTERING; SPECTRA; DIAMETER;

D O I：

10.1103/PhysRevB.91.155415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For elucidation of the adsorption effects on the vibration properties of single-walled carbon nanotubes (SWNTs), photoluminescence and Raman scattering spectra from SWNTs at different vapor pressure of water were simultaneously measured and a molecular dynamics (MD) simulation was performed. The water vapor pressure dependence and its tube diameter (d(tube)) dependence of the frequency of the radial breathing mode (RBM) peaks (omega(RBM)) and the optical transition energy (E-ii) indicate that the physical adsorption is quite important, and both omega(RBM) and E-ii clearly depend on the number density of adsorption molecules on the SWNT surface. A simple adsorption model, where the vibrational coupling between the surrounding adsorption layer and SWNTs via van der Waals interaction is considered for RBM, reproduces the experimental and MD simulation results of omega(RBM) in a wide dtube range for various SWNTs, such as isolated SWNTs in vacuum, SWNTs with adsorption water layer, and even bundled SWNTs. On the basis of the model, the variation of the relationship between omega(RBM) and E-ii in a Kataura plot for various SWNT samples can also be understood generally as the "environmental effects."

引用

页数：5

共 37 条

[1] The role of environmental effects on the optical transition energies and radial breathing mode frequency of single wall carbon nanotubes [J].