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均匀电子束辐照诱导多壁碳纳米管非晶化
Authors
朱贤方
程亮
董小花
陈春彩
Publication date
11 March 2019
Publisher
Abstract
在室温下利用已经发展成熟的透射电镜原位观察技术,在均匀电子束辐照下对多壁碳纳米管(MWCNT)的非晶化过程进行了研究。实验结果表明,在均匀电子束辐照下MWCNT内、外壁完整的石墨结构开始出现断裂或塌陷,即内层和外层优先开始非晶化,但是内层非晶化的速度明显更快。随着辐照时间的增加,非晶化逐渐由内、外表面向中间推进。同时,内壁断裂或塌陷形成的无定形碳开始向管的内部中空部分填充,而外壁非晶化的碳原子部分被融蒸到真空中。最终,无定形碳填满整个管的内部空间,导致MWCNT完全非晶化。另外,我们发现在整个过程中因为非晶化体积膨胀补偿MWCNT的外径基本保持不变。我们利用在碳纳米管纳米曲率效应和能量束诱导非热激活效应基础上新发展的碳原子“融蒸”机制对上述MWCNT的非晶化过程进行了全新、合理的解释。国家自然科学基金(11574255);;福建省科技厅科技计划(合作)重点项目(2014I0016);;国家重点基础科学研究计划(973计划)(2007CB936603
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Xiamen University Institutional Repository
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oai:dspace.xmu.edu.cn:2288/176...
Last time updated on 20/11/2020
Xiamen University Institutional Repository
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:dspace.xmu.edu.cn:2288/176...
Last time updated on 20/11/2020