【摘 要】
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From both fundamental and technical points of view,precise control of the layer number in graphene samples is very desirable.To reach this goal,it is import
【机 构】
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合肥微尺度物质科学国家实验室,中国科学技术大学,中国,安徽,合肥230026
论文部分内容阅读
From both fundamental and technical points of view,precise control of the layer number in graphene samples is very desirable.To reach this goal,it is important to understand the atomic scale mechanisms of multilayer graphene growth on metal surfaces.Although it is geometrically a very favorable pathway to transport carbon species to interface and form new graphene layer there,penetration of a graphene overlayer is not a chemically straightforward process.In this study,the possibility of different active species to penetrate a graphene overlayer on Cu(111)surface is investigated based on density functional theory(DFT)calculations.It is found that carbon atom penetration can be realized via an atom exchange process,leading to a new graphene growth mechanism.Based on this insight,a bilayer graphene growth protocol(Fig.1)is proposed to obtain high quality samples,which also provides a great flexibility for designed growth.
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