First principles study of behavior of helium at Fe(110)-graphene interface
Yan-Mei Jing(荆艳梅) and Shao-Song Huang(黄绍松)†
1 Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China
Abstract Recently, metal-graphene nanocomposite system has aroused much interest due to its radiation tolerance behavior. However, the related atomic mechanism for the metal-graphene interface is still unknown. Further, stainless steels with Fe as main matrix are widely used in nuclear systems. Therefore, in this study, the atomic behaviors of point defects and helium (He) atoms at the Fe(110)-graphene interface are investigated systematically by first principles calculations. The results indicate that graphene interacts strongly with the Fe(110) substrate. In comparison with those of the original graphene and bulk Fe, the formation energy values of C vacancies and Fe point defects decrease significantly for Fe(110)-graphene. However, as He atoms have a high migration barrier and large binding energy at the interface, they are trapped at the interface once they enter into it. These theoretical results suggest that the Fe(110)-graphene interface acts as a strong sink that traps defects, suggesting the potential usage of steel-graphene with multiply interface structures for tolerating the radiation damage.
Fund: Project supported by the Nuclear Power Technology Innovation Center Program, National Defense Science & Technology Industry, China (Grant No. HDLCXZX-2019-ZH-028).
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.