Oxidation and thermal stability of linear carbon chains contained in thermally treated double-walled carbon nanotubes.
Oxidation and thermal stability of linear carbon chains contained in thermally treated double-walled carbon nanotubes.
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DOI：
10.1002/smll.200600570
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发表时间：
2007-05
期刊：
影响因子：
13.3
通讯作者：
H. Muramatsu;Y. Kim;T. Hayashi;M. Endo;M. Terrones;M. Dresselhaus
中科院分区：
文献类型：
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作者：
H. Muramatsu;Y. Kim;T. Hayashi;M. Endo;M. Terrones;M. Dresselhaus
线性碳链的合成和表征是近年来研究的热点，因为这些sp-bonded碳同素异形体具有独特的光学性质，被认为是一维（1D）导电材料。[1-3]特别地，拉曼技术已经被用于获得关于传统线性sp碳链的结构信息，其特征振动出现在约2000-2200 cm-1处。[4，5]最近，在氢气氛中通过电弧放电制备的多壁碳纳米管（MWNT）上观察到位于1855 cm-1处的特征拉曼谱线。[6]基于透射电子显微镜（TEM）和空气稳定性的研究，在1855 cm-1的拉曼带被分配到位于电弧产生的MWNTs的中空核心的线性碳链的存在下。[6-8]在这种情况下，我们的小组已经确定了线性碳链的发生在双壁（DW）NT的聚结使用共振拉曼光谱。[9，10]我们注意到位于1855 cm-1处的尖锐拉曼线的出现，其与短线性碳链的振动有关，并且被观察到是相邻DWNT合并的前体。[9，10]因此，这种振动模式被命名为聚结诱导模式（CIM），我们将CIM
Intensive studies related to the synthesis and characterization of linear carbon chains have been carried out recently because these sp-bonded carbon allotropes exhibit unique optical properties and are thought to behave as one-dimensional (1D) conducting materials.[1–3] In particular, Raman techniques have been utilized for obtaining structural information about traditional linear sp carbon chains, whose characteristic vibrations appear at around 2000–2200 cmÀ1.[4, 5]More recently, characteristic Raman lines located at 1855 cmÀ1 were observed on multi-walled carbon nanotubes (MWNTs) prepared by arc discharge in a hydrogen atmosphere.[6] Based on transmission electron microscopy (TEM) and air-stability studies, the Raman band at 1855 cmÀ1 was assigned to the presence of a linear carbon chain located in the hollow core of arc-produced MWNTs.[6–8] In this context, our group has identified the occurrence of linear carbon chains during the coalescence of double-walled (DW) NTs using resonant Raman spectroscopy.[9, 10] We noted the appearance of a sharp Raman line located at% 1855 cmÀ1, which is related to vibrations of short linear carbon chains, and is observed to be a precursor of the merging of adjacent DWNTs.[9, 10] This vibrational mode was therefore named the coalescence-inducing mode (CIM) and we assigned the CIM