Nickel-Assisted Healing of Defective Graphene

详细信息    查看全文

• 作者：Sondes Karoui ; Hakim Amara ; Christophe Bichara ; François Ducastelle
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：October 26, 2010
• 年：2010
• 卷：4
• 期：10
• 页码：6114-6120
• 全文大小：1376K
• 年卷期：0
• ISSN：1936-086X

文摘

The healing of graphene grown from a metallic substrate is investigated using tight-binding Monte Carlo simulations. At temperatures (ranging from 1000 to 2500 K), an isolated graphene sheet can anneal a large number of defects suggesting that their healings are thermally activated. We show that in the presence of a nickel substrate we obtain a perfect graphene layer. The nickel−carbon chemical bonds keep breaking and reforming around defected carbon zones, providing a direct interaction, necessary for the healing. Thus, the action of Ni atoms is found to play a key role in the reconstruction of the graphene sheet by annealing defects.