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

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 wat...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-04, Vol.91 (15), Article 155415
Main Authors: Chiashi, Shohei, Kono, Kaname, Matsumoto, Daiki, Shitaba, Junpei, Homma, Naoki, Beniya, Atsushi, Yamamoto, Takahiro, Homma, Yoshikazu
Format: Article
Language:English
Subjects:
Adsorption
Breathing
Bundling
Condensed matter
Density
Single wall carbon nanotubes
Surface chemistry
Water vapor
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Summary: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 sub(tube)) dependence of the frequency of the radial breathing mode (RBM) peaks ( omega sub(RBM)) and the optical transition energy (E sub(ii)) indicate that the physical adsorption is quite important, and both omega sub(RBM) and E sub(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 sub(RBM) in a wide d sub(tube) 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 sub(RBM) and E sub(ii) in a Kataura plot for various SWNT samples can also be understood generally as the "environmental effects."
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.91.155415