期刊
CARBON
卷 60, 期 -, 页码 186-192出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.04.012
关键词
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资金
- National Natural Science Foundation of China [91026018, 60979017]
- Doctoral Fund of Ministry of Education of China [20110111110015]
- Fundamental Research Funds for the Central Universities [2011HGZY0011]
- High-Tech Research and Development Project Program of China (863) [2013AA051402]
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.
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