Using the Graphene Moir茅 Pattern for the Trapping of C60 and Homoepitaxy of Graphene

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• 作者：Jiong Lu ; Pei Shan Emmeline Yeo ; Yi Zheng ; Zhiyong Yang ; Qiaoliang Bao ; Chee Kwan Gan ; Kian Ping Loh
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：January 24, 2012
• 年：2012
• 卷：6
• 期：1
• 页码：944-950
• 全文大小：503K
• 年卷期：v.6,no.1(January 24, 2012)
• ISSN：1936-086X

文摘

The graphene Moir茅 superstructure offers a complex landscape of humps and valleys to molecules adsorbing and diffusing on it. Using C₆₀ molecules as the classic hard sphere analogue, we examine its assembly and layered growth on this corrugated landscape. At the monolayer level, the cohesive interactions of C₆₀ molecules adsorbing on the Moir茅 lattice freeze the molecular rotation of C₆₀ trapped in the valley sites, resulting in molecular alignment of all similarly trapped C₆₀ molecules at room temperature. The hierarchy of adsorption potential well on the Moir茅 lattice causes diffusion-limited dendritic growth of C₆₀ films, as opposed to isotropic growth observed on a smooth surface like graphite. Due to the strong binding energy of the C₆₀ film, part of the dentritic C₆₀ films polymerize at 850 K and act as solid carbon sources for graphene homoepitaxy. Our findings point to the possibility of using periodically corrugated graphene in molecular spintronics due to its ability to trap and align organic molecules at room temperature.

Keywords:

molecular assemblies; graphene Moir茅 template; potential well; C₆₀ molecular array; homoepitaxy of graphene