Subject Area物理化学
Dynamic characterization of graphene growth on Ru(0001) by PEEM and LEEM
Fu Q(傅强); Cui Y(崔义); Li J(李津); Zhang H(张辉); Bao XH(包信和)
Conference Name15th International Conference on Solid Films and Surfaces
Conference Date2010-10-5
Conference Place中国
Funding Organization清华大学
AbstractWe 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 HREELS, 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 can be regarded as building blocks, which assemble into large size graphene. Via controlling of growth temperature, well-defined graphene overlayers ranging from nanographene to millimeter 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 was proposed for graphene growth on metal surfaces through the surface segregation route [3, 4]. Furthermore, the in-situ PEEM/LEEM investigations indicate that intercalation of graphene via oxygen, Pb, and CO could take place, resulting in formation of free-standing graphene supported on metal substrates.
Document Type会议论文
Corresponding AuthorFu Q(傅强)
Recommended Citation
GB/T 7714
Fu Q,Cui Y,Li J,et al. Dynamic characterization of graphene growth on Ru(0001) by PEEM and LEEM[C],2010:-/2.
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