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Polarization dependence of radial breathing mode peaks in resonant Raman spectra of vertically aligned single-walled carbon nanotubes

机译:垂直排列的单壁碳纳米管共振拉曼光谱中径向呼吸模式峰的极化相关性

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摘要

Polarization-dependent resonance Raman spectra of a vertically aligned single-walled carbon nanotube (SWNT) array were measured such that the polarization of the scattered light was selected either parallel or perpendicular to that of the incident light. For the parallel configuration, radial breathing mode (RBM) peaks exhibited two different polarization angle dependencies. One group (dominated by a peak at 203 cm~(-1)) had a maximum scattering intensity for incident light parallel to the alignment direction whereas the other group (dominated by a peak at 181 cm~(-1)) had maximum intensity for excitation perpendicular to the alignment direction. This anomalous behavior has been attributed to resonance with nonvertical transitions due to perpendicularly polarized excitation [Y. Murakami et al., Phys. Rev. B 71, 085403 (2005)]. Here we systematically measure the polarization-dependent Raman spectra and compare to theoretical expectations for the two different configurations. The 203 cm~(-1) group peaks are found to behave as expected for parallel-polarized dipole excitation, however the 181 cm~(-1) group peaks deviate significantly from the prediction assuming perpendicularly polarized excitation. The 181 cm~(-1) group peak intensities were found to be both environment and morphology dependent, indicative of isolated SWNTs. Therefore, the sound interpretation of these results is that the apparently anomalous polarization dependence is not due to perpendicular RBM excitation but rather the parallel excitation of isolated SWNTs suspended within the array.
机译:测量垂直排列的单壁碳纳米管(SWNT)阵列的偏振相关共振拉曼光谱,以使散射光的偏振与入射光的偏振平行或垂直。对于平行配置,径向呼吸模式(RBM)峰表现出两个不同的偏振角依赖性。一组(以203 cm〜(-1)处的峰为主)对平行于取向方向的入射光具有最大散射强度,而另一组(以181 cm〜(-1)处的峰为主)用于垂直于对准方向的激励。这种异常行为归因于由于垂直极化激发而引起的非垂直跃迁的共振[Y.村上等。 B 71,085403(2005)。在这里,我们系统地测量了偏振相关的拉曼光谱,并与两种不同配置的理论预期值进行了比较。发现203 cm〜(-1)组峰的行为与平行极化偶极激发的预期相符,但是181 cm〜(-1)组峰与假设垂直极化激发的预测值明显不同。发现181 cm〜(-1)组的峰强度与环境和形态有关,表明存在分离的SWNT。因此,对这些结果的合理解释是,显然异常的极化依赖性不是由于垂直RBM激发,而是由于悬浮在阵列中的孤立SWNT的平行激发。

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  • 来源
    《Physical review》 |2010年第16期|165442.1-165442.9|共9页
  • 作者单位

    Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA;

    rnDepartment of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Global Edge Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;

    rnInstitute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan Center for Integrated Science and Engineering, Columbia University, New York, New York 10027, USA;

    rnDepartment of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;

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