CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Edge effects on the characteristics of uranium diffusion on graphene and graphene nanoribbons |
Cheng Cheng(程诚)1, Han Han(韩晗)1, Cui-Lan Ren(任翠兰)1,2, Chang-Ying Wang(王昌英)1,3, Kuan Shao(邵宽)1, Ping Huai(怀平)1 |
1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
2 Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai 201800, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The first principles density-functional theoretical calculations of U adatom adsorption and diffusion on a planar graphene and quasi-one-dimensional graphene nanoribbons (GNRs) are performed. An energetic preference is found for U adatom diffusing to the hollow sites of both graphene and GNRs surface. A number of U distinctive diffusion paths either perpendicular or parallel to the ribbon growth direction are examined. The edge effects are evidenced by the calculated energy barriers of U adatom diffusion on armchair and zigzag nanoribbons surfaces. The calculation results indicate that the diffusion of U adatom from the inner site toward the edge site is a feasible process, particularly in zigzag GNR. It is viable to control the initial morphology of nuclear carbon material to retard the diffusion and concentration of nuclides.
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Received: 19 January 2016
Revised: 07 April 2016
Accepted manuscript online:
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PACS:
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63.20.dk
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(First-principles theory)
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42.25.Gy
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(Edge and boundary effects; reflection and refraction)
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68.49.Bc
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(Atom scattering from surfaces (diffraction and energy transfer))
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Fund: Project supported by the International S & T Cooperation Program of China (Grant No. 2014DFG60230), the National Natural Science Foundation of China (Grant Nos. 91326105, 21306220, and 21501189), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA02040104). |
Corresponding Authors:
Cheng Cheng, Ping Huai
E-mail: chengcheng@sinap.ac.cn;huaiping@sinap.ac.cn
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Cite this article:
Cheng Cheng(程诚), Han Han(韩晗), Cui-Lan Ren(任翠兰), Chang-Ying Wang(王昌英), Kuan Shao(邵宽), Ping Huai(怀平) Edge effects on the characteristics of uranium diffusion on graphene and graphene nanoribbons 2016 Chin. Phys. B 25 086301
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