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学科主题物理化学
Controllable growth of graphene on Ru(0001): from graphene nanoclusters to multilayer graphene
Cui Y(崔义); Fu Q(傅强); Bao XH(包信和)
会议文集Precedings of CarboCat IV
会议名称4th International Symposium on Carbon for Catalysis
会议日期2010-11-7
2011
会议地点大连
页码77-0
出版者待补充
出版地待补充
合作性质墙报
部门归属502
主办者大连化物所
英文摘要Here, we present the synthesis of graphene with controlled lateral size and thickness via epitaxial growth on Ru(0001). Either ethylene (C2H4) or coronene (C24H12) was used as the precursors for graphene growth. The mechanism of how 2D graphene overlayers evolve from the hydrocarbon precursors was investigated by high resolution electron energy loss spectroscopy (HREELS), scanning tunneling microscopy (STM) and photoemission electron microscopy (PEEM). We found that identical-size graphene nanoclusters with the 3-C6 ring (C24 cluster) and 7-C6 ring (C13 cluster) structures form on Ru(0001) after pyrolysis of both C2H4 and C24H12 at elevated temperatures (around 900 K). The nanographene clusters presents dome shape because of the stronger interaction of the edge carbon atoms with surface Ru atoms than those in the center of the cluster. The formed well-defined GNCs present as ideal models to study electronic/magnetic properties and chemical reactivity of nanographene. Via controlling of growth temperature, well-defined graphene overlayers ranging from nanographene to centimeter sized continuous graphene films have been obtained [1,2]. Besides the lateral size of graphene layer, thickness is another important structural character of graphene. The growth of multilayer graphene was attempted on Ru(0001) surface. In-situ low energy electron microscopy (LEEM) and PEEM investigations indicate that single layer graphene forms on bare Ru(0001) via the surface segregation of carbon, and the second layer starts to appear after the completion of the first layer. The topmost surface of the multilayer graphene is physically continuous as indicated by the STM images. Accordingly, a bottom-up growth mechanism, in which the newly formed graphene layer locates underneath the previously formed graphene layer rather than on its top, was proposed for graphene growth on metal surfaces through the surface segregation route. [3,4].; Here, we present the synthesis of graphene with controlled lateral size and thickness via epitaxial growth on Ru(0001). Either ethylene (C2H4) or coronene (C24H12) was used as the precursors for graphene growth. The mechanism of how 2D graphene overlayers evolve from the hydrocarbon precursors was investigated by high resolution electron energy loss spectroscopy (HREELS), scanning tunneling microscopy (STM) and photoemission electron microscopy (PEEM). We found that identical-size graphene nanoclusters with the 3-C6 ring (C24 cluster) and 7-C6 ring (C13 cluster) structures form on Ru(0001) after pyrolysis of both C2H4 and C24H12 at elevated temperatures (around 900 K). The nanographene clusters presents dome shape because of the stronger interaction of the edge carbon atoms with surface Ru atoms than those in the center of the cluster. The formed well-defined GNCs present as ideal models to study electronic/magnetic properties and chemical reactivity of nanographene. Via controlling of growth temperature, well-defined graphene overlayers ranging from nanographene to centimeter sized continuous graphene films have been obtained [1,2]. Besides the lateral size of graphene layer, thickness is another important structural character of graphene. The growth of multilayer graphene was attempted on Ru(0001) surface. In-situ low energy electron microscopy (LEEM) and PEEM investigations indicate that single layer graphene forms on bare Ru(0001) via the surface segregation of carbon, and the second layer starts to appear after the completion of the first layer. The topmost surface of the multilayer graphene is physically continuous as indicated by the STM images. Accordingly, a bottom-up growth mechanism, in which the newly formed graphene layer locates underneath the previously formed graphene layer rather than on its top, was proposed for graphene growth on metal surfaces through the surface segregation route. [3,4].
语种英语
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/115901
专题中国科学院大连化学物理研究所
通讯作者Fu Q(傅强); Bao XH(包信和)
推荐引用方式
GB/T 7714
Cui Y,Fu Q,Bao XH. Controllable growth of graphene on Ru(0001): from graphene nanoclusters to multilayer graphene[C]. 待补充:待补充,2011:77-0.
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