Raman spectroscopy of nondispersive intermediate frequency modes and their overtones in carbon nanotubes

Raman spectroscopy of nondispersive intermediate frequency modes and their overtones in carbon nanotubes
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碳纳米管中非色散中频模式及其泛音的拉曼光谱

DOI:
10.1002/pssb.201552513
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发表时间:
2015
期刊:
physica status solidi (b)
影响因子:
--
通讯作者:
J. Maultzsch
J. Maultzsch
中科院分区:
--
文献类型:
--
作者:
C. Tyborski;F. Herziger;J. Maultzsch

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我们使用 和 之间的激光激发能量,对 HiPCO 生产的单壁碳纳米管在 846 和 光谱范围内进行了共振拉曼光谱分析。我们在 1692 年左右观察到了一个特征峰及其泛音。尤其是后者在过去引起了争议,并被分配给涉及两个 oTO 声子的双共振拉曼过程。我们证明,两个峰的形状、强度和峰位置都稍微依赖于激发激光能量。遵循 Dobardžić 等人提出的模型,我们将两个峰与 oTO 点声子联系起来。当我们同时分析一阶谱带及其泛音时,我们能够对碳纳米管中的这些低强度拉曼谱带提供统一的解释。HiPCO 生产的巴基纸碳纳米管样品在 2.33eV 激光能量下的拉曼光谱。两个插图都显示了与 oTO 相关的一阶和二阶拉曼带的放大结果,我们将在本文中对此进行讨论。
We performed resonance Raman spectroscopy on HiPCO‐produced single‐walled carbon nanotubes in the spectral region of 846 and , using laser excitation energies between and . We observe a characteristic peak around and its overtones around 1692. Especially the latter was controversially discussed in the past and has been assigned to a double‐resonant Raman process involving two oTO phonons. We demonstrate that both peaks slightly depend on the excitation laser energy by means of their shape, intensity, and peak position. Following the model proposed by Dobardžić et al., we relate both peaks to oTO ‐point phonons. As we analyze both, the first‐order band and its overtone simultaneously, we are able to provide a unified explanation of these low‐intensity Raman bands in carbon nanotubes.Raman spectrum of an HiPCO‐produced buckypaper carbon nanotube sample at 2.33 eV laser energy. Both insets show a magnification of the oTO‐related first‐ and second‐order Raman bands, which we discuss in this article.
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