Oxidation of Carbon Nanotubes in an Ionizing Environment.
Oxidation of Carbon Nanotubes in an Ionizing Environment.
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DOI：
10.1021/acs.nanolett.5b03035
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发表时间：
2016-02-10
期刊：
影响因子：
10.8
通讯作者：
Sinclair R
中科院分区：
文献类型：
--
作者：
Koh AL;Gidcumb E;Zhou O;Sinclair R
在这项工作中，我们在环境透射电子显微镜（ETEM）下系统地研究了电离分子气体的照明电子束如何影响碳纳米管氧化的机制。我们发现在分子气体环境中，纳米管尖端的优先攻击比氧化更普遍。我们建立了80 keV电子束在气体和高真空中辐照破坏碳纳米管所需的累积电子剂量。我们的研究结果为研究碳纳米管在气体环境中或没有气体环境中所需的电子剂量提供了指导，以确定或改善成像电子束的影响。这项工作对原位研究以及碳纳米管在电离环境中的氧化（如在场发射期间发生的氧化）具有重要意义。
In this work, we present systematic studies on how an illuminating electron beam which ionizes molecular gas species can influence the mechanism of carbon nanotube oxidation in an environmental transmission electron microscope (ETEM). We found that preferential attack of the nanotube tips is much more prevalent than for oxidation in a molecular gas environment. We establish the cumulative electron doses required to damage carbon nanotubes from 80 keV electron beam irradiation in gas versus in high vacuum. Our results provide guidelines for the electron doses required to study carbon nanotubes within or without a gas environment, to determine or ameliorate the influence of the imaging electron beam. This work has important implications for in situ studies as well as for the oxidation of carbon nanotubes in an ionizing environment such as that occurring during field emission.