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arXiv 0812.3751cond-mat.mtrl-sci
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石墨烯中的金:面内吸附和扩散

Gold in graphene: in-plane adsorption and diffusion

S. Malola, H. Häkkinen, P. Koskinen

摘要:

利用密度泛函理论研究了Au在石墨烯空位中的成键和扩散。能量学表明,Au优选地吸附到双空位,稳定地与石墨烯共面。双空位Au复合物的扩散势垒均在4eV以上,而大空位Au复合物的扩散势垒均在2eV以下。我们的研究结果支持了最近实验的主要结果[GAN等人,Small 4,587(2008)],但表明观察到的扩散机制不是热激活的,而是辐射增强的。

英文摘要:

We study the bonding and diffusion of Au in graphene vacancies using density-functional theory. Energetics show that Au adsorbs preferably to double vacancies, steadily in-plane with graphene. All diffusion barriers for the complex of Au in double vacancy are above 4 eV, whereas the barriers for larger vacancies are below 2 eV. Our results support the main results of a recent experiment [Gan et al., Small 4, 587 (2008)], but suggest that the observed diffusion mechanism is not thermally activated, but radiation-enhanced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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