Morphology Dependence of Raman Properties of Carbon Nanotube Layers Formed on Nanostructured CeO2 Films
Morphology Dependence of Raman Properties of Carbon Nanotube Layers Formed on Nanostructured CeO2 Films
复制标题
纳米结构 CeO2 薄膜上形成的碳纳米管层拉曼特性的形态依赖性
DOI：
10.1021/jp108023f
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发表时间：
2011-02-10
影响因子：
3.7
通讯作者：
Kunsagi-Mate, Sandor
中科院分区：
文献类型：
--
作者：
Li, Heng;Petz, Andrea;Kunsagi-Mate, Sandor
将多壁碳纳米管(MWCNTs)从溶液相沉积到蓝宝石衬底上生长的纳米CeO2薄膜上。扫描电子显微镜的高分辨率图像显示，多壁碳纳米管位于CeO2岛的顶部。这些组合材料的拉曼位移与CeO2纳米结构的形貌有很大的依赖关系。量子化学计算证实了纳米管的共振振动，特别是对于典型表面形貌的静止纵波，是拉曼信号这种意想不到的特性的起源。考虑到CeO2的表面形貌完全受生长实验装置的控制，碳纳米管层的性质可以根据实际应用的要求进行调整。
Multiwalled carbon nanotubes (MWCNTs) were deposited from solution phase onto the nanostructured CeO2 films grown on a sapphire substrate. High-resolution images by scanning electron microscopy showed that MWCNTs laid on the top of CeO2 islands. Raman shifts of these combinatorial materials showed considerable dependence on the morphology of the underlying CeO2 nanostructures. Quantum chemical calculations validated the resonant nanotube vibrations, especially for the stationary longitudinal wave at typical surface morphology, as the origin of this unexpected property of the Raman signal. Considering that the CeO2 surface morphology is fully controlled by the experimental setup of growth, properties of the CNT layers are tunable toward the requirements of practical applications.