Subject Area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)
Conference Name4th International Symposium on Carbon for Catalysis
Conference Date2010-11-7
Conference Place中国
Funding Organization大连化物所
AbstractHere, 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].
Document Type会议论文
Corresponding AuthorFu Q(傅强); Bao XH(包信和)
Recommended Citation
GB/T 7714
Cui Y,Fu Q,Bao XH. Controllable growth of graphene on Ru(0001): from graphene nanoclusters to multilayer graphene[C],2010:77/2.
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