TEM image simulation study of small carbon nanotubes and carbon nanowire
TEM image simulation study of small carbon nanotubes and carbon nanowire
复制标题
DOI：
10.1016/j.carbon.2005.11.017
复制
发表时间：
2006-06-01
期刊：
影响因子：
10.9
通讯作者：
Dresselhaus, MS
中科院分区：
文献类型：
--
作者：
Hayashi, T;Muramatsu, H;Dresselhaus, MS
最近在多壁碳纳米管(MWCNT)的核心中发现了极小直径的碳纳米管和纳米线，引起了广泛的研究人员的兴趣。对碳纳米管的直接观察通常是用透射电子显微镜进行的。当纳米管变得更小时，不仅因为弱散射，而且由于干涉效应和不适当的散焦条件而开始出现伪影，使得正确理解透射电子显微镜图像变得更加困难。在本研究中，我们发现由于不适当的散焦条件导致的像鬼条纹这样的伪影出现在多壁碳纳米管的核心，并且可以被误解为碳纳米线或小的碳纳米管。在透射电子显微镜图像中，很难区分单壁纳米管束和双壁碳纳米管束。最后，我们提出横截面观察对于正确表征单壁和双壁碳纳米管束是必要的。(C)2005爱思唯尔有限公司。保留所有权利。
Recent findings of extremely small diameter carbon nanotube and nanowire in the core of a multi-walled carbon nanotube (MWCNT) have attracted interests from broad range of researchers. Direct observation of carbon nanotube is usually done using a transmission electron microscope (TEM). When nanotubes become smaller, it becomes harder to correctly understand the TEM images, not only because of the weak scattering, but also due to the artifact that starts to appear because of the interference effect and the inappropriate defocus condition.In this study, we have shown that the artifact such as ghost fringes due to inappropriate: defocus conditions of the TEM appear in the core of an MWCNT, and can be misinterpreted as either carbon nanowire or small carbon nanotube. It is also shown that, in the TEM image, it is hard to distinguish a single-walled nanotube bundle from a double-walled carbon nanotube bundle. Finally, we propose that the cross-sectional observation is necessary for the correct characterization of single- and double-walled carbon nanotube bundles. (c) 2005 Elsevier Ltd. All rights reserved.