Characterisation of carbon nano-onions using Raman spectroscopy
Characterisation of carbon nano-onions using Raman spectroscopy
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DOI：
10.1016/s0009-2614(03)00523-2
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发表时间：
2003-05-13
影响因子：
2.8
通讯作者：
Amaratunga, GAJ
中科院分区：
文献类型：
--
作者：
Roy, D;Chhowalla, M;Amaratunga, GAJ
根据G峰的位置和横向光学声子峰的外观，确定了碳洋葱的拉曼光谱特征。在低波数区观测到5个新峰，分别位于1100,861,700,450和250cm（-1）处。从声子态密度（PDOS）和石墨声子色散曲线的角度讨论了这些峰的起源。石墨烯平面的曲率被用来解释拉曼选择规则的松弛和新峰的出现。比较了碳洋葱和高取向热解石墨的拉曼光谱。石墨烯平面由于曲率引起的应变已被分析估计，并用于解释G峰向下移动。(C) 2003 Elsevier Science B.V.版权所有
Characteristics of the Raman spectrum from carbon onions have been identified in terms of the position of the G peak and appearance of the transverse optic phonon peaks. Five new peaks were observed in the low wavenumber region, at about 1100, 861, 700, 450 and 250 cm(-1). The origins of these peaks are discussed in terms of the phonon density of states (PDOS) and phonon dispersion curves of graphite. The curvature of the graphene planes is invoked to explain the relaxation of the Raman selection rules and the appearance of the new peaks. The Raman spectrum of carbon onions is compared with that of highly oriented pyrolytic graphite (HOPG). The strain of graphene planes due to curvature has been estimated analytically and is used to account for the downward shift of the G peak. (C) 2003 Elsevier Science B.V. All rights reserved.