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

机译：吸附对单壁碳纳米管径向呼吸模式的影响

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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 (ω_(RBM)) and the optical transition energy (E_ⅱ) indicate that the physical adsorption is quite important, and both ω_(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 ω_(RBM) in a wide d_(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 ω_(RBM) and E_ⅱ in a Kataura plot for various SWNT samples can also be understood generally as the "environmental effects."
机译：为了阐明吸附对单壁碳纳米管（SWNTs）振动性能的影响，同时测量了SWNTs在不同水蒸气压下的光致发光和拉曼散射光谱，并进行了分子动力学（MD）模拟。径向呼吸模式（RBM）峰值频率（ω_（RBM））和光学跃迁能量（E_ⅱ）的水蒸气压依赖性及其与管径（d_（tube））的依赖性表明物理吸附非常重要，ω_（RBM）和E_ⅱ都明显取决于SWNT表面上吸附分子的数量密度。一个简单的吸附模型考虑了RBM的周围吸附层与SWNT之间通过范德华相互作用的振动耦合，从而再现了各种SWNT在宽d_（tube）范围内的ω_（RBM）的实验和MD模拟结果，例如在真空中隔离的SWNT，带有吸附水层的SWNT，甚至是捆绑的SWNT。基于该模型，对于各种SWNT样品，在Kataura图中的ω_（RBM）和E_ⅱ之间的关系的变化通常也可以理解为“环境效应”。

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  • 来源
    《Physical review》 |2015年第15期|155415.1-155415.5|共5页
  • 作者

    Shohei Chiashi; Kaname Kono; Daiki Matsumoto; Junpei Shitaba; Naoki Homma; Atsushi Beniya; Takahiro Yamamoto; Yoshikazu Homma;

  • 作者单位

    Nanocarbon Research Division, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan,Department of Mechanical Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan;

    Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan;

    Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan;

    Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan;

    Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan;

    Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan;

    Nanocarbon Research Division, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan,Department of Liberal Arts, Faculty of Engineering, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan,Department of Electrical Engineering, Graduate School of Engineering, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan;

    Nanocarbon Research Division, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan,Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan;

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  • 正文语种 eng
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  • 关键词

    nanotubes; chemisorption/physisorption: adsorbates on surfaces; water quality and water resources;

    机译：纳米管化学吸附/物理吸附：表面吸附物;水质和水资源;

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