The effect of gamma ray irradiation on the structure of graphite and multi-walled carbon nanotubes

被引：73
作者：
Li, Bin [1 ]
Feng, Yi [1 ]
Ding, Kewang [1 ]
Qian, Gang [1 ]
Zhang, Xuebin [1 ]
Zhang, Jingcheng [1 ]
机构：
[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China
来源：
CARBON | 2013年 / 60卷
基金：
国家教育部博士点专项基金资助; 中国国家自然科学基金;
关键词：
RADIATION; DEFECTS; FIBERS; IONS;
D O I：
10.1016/j.carbon.2013.04.012
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Graphite and multi-walled carbon nanotubes (MWCNTs) irradiated by gamma-rays were studied by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. The results show that gamma-irradiation improves the degree of structural order in graphite and an irradiation dose of 200 kGy is the most effective. However, gamma-irradiation decreases the degree of graphitization of the nanotubes because of the generation of defects in the carbon atom lattice and produces an amorphous structure through knock-on displacements and sputtering of carbon atoms. When the irradiation dose. exceeds 200 kGy the defect dynamics change and the nanotubes are annealed. Curvature-induced strain, reduced dimensionality and a large surface area of the CNT are responsible for the difference between graphite and MWCNTs after gamma-irradiation. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：186 / 192
页数：7
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