| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Uniform Electron Beam Irradiation Induced Amorphization of Multi-walled Carbon Nanotubes |
| DONG Xiaohua1,2, CHENG Liang1,2, CHEN Chuncai3, ZHU Xianfang1,2
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1 China-Australia Joint Laboratory for Functional Nanomaterials, Department of Physics, Xiamen University, Xiamen 361005
2 Jiujiang Research Institute, Xiamen University, Xiamen 361005
3 Department of University Physics, College of Civil Engineering, Minnan University of Science and Technology, Shishi 362700 |
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Abstract Uniform electron beam irradiation induced amorphization of multi-walled carbon nanotubes (MWCNT) was in-situ investigated by transmission electron microscopy at room temperature. It was observed that the graphite structure of the inner and outer layers of MWCNT began to break or collapse under the uniform electron beam irradiation, namely, the amorphization of the inner and outer layers of MWCNT carried out preferentially, and the inner layer held an obviously faster amorphization rate than the outer layer. Specially, the amorphization gradually advanced from the inner and outer layers to the middle layers as the prolonging of irradiation time. Meanwhile, the inner hollow of the tube was gradually filled by the broken or collapsed carbon atoms of inner layer, while the broken or collapsed carbon atoms of outer layer were partially evaporated into the space. Eventually, the inner hollow of the tube was fully filled by the amorphous carbon fragment, resulting in complete amorphization of the MWCNT. In addition, the outer diameter of the MWCNT was found to be almost unchanged throughout the process, which might be attributed to the compensation of volume expansion of the amorphization. The newly developed “evaporation” mechanism of carbon atoms derived on the basis of nano-curvature effect of carbon nanotube and the energetic beam-induced non-thermal activation effect was employed to give a novel and reasonable explanation of above mentioned amorphization of MWCNT.
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Published: 28 October 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (11574255), the Science and Technology Plan (Cooperation) Key Project from Fujian Province Science and Technology Department (2014I0016), and the National Key Basic Science Research Program (973 Project) (2007CB936603). |
| About author:: Xiaohua Dong is pursuing her master of science degree in the Department of Physics and the China-Australia Joint Laboratory for Functional Nanomaterials at Xiamen University, focusing on the research of stability of low-dimensional nanomaterials;Xianfang Zhu received his Ph.D. degree in Australian National University. Professor Xianfang Zhu is currently the director of China-Australia Joint Laboratory for Functional Nanomaterials, a Distinguished Foreign Expert of Xiamen University and Adjunct Professor of Queensland University. His research has long been focused on nanostructure design, preparation, modification and stability. He has published more than 100 papers and filed 10 patents in the relevant fields. |
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2019, Vol. 33 
