题目：In-situ observation of graphene growth dynamics by environmental scanning electron microscopy
地点：909号楼一楼B会议室(Conference Room B, 909-1F)
Most promising approaches for industrial scale production of graphene are based on metal catalysed chemical vapour deposition (CVD). Although improvements in graphene quality and yield have been achieved, there remains a lack in the mechanistic understanding of graphene formation. This lack of understanding is due to the fact that most insights on graphene growth have been derived from post growth characterizations, which are in principle incapable of capturing the dynamics of a CVD process. Here we report on in-situ graphene growth on nickel, copper and platinum catalysts inside a modified environmental scanning electron microscope. Using this method, we are able to visually follow the complete CVD process involving substrate annealing, graphene nucleation and growth and finally, substrate cooling. Due to the high sensitivity of the secondary electron signal to changes at the surface, we are able to visualize the formation and growth of single atom thick graphene sheets.
Figure 1：a) shows colorized snapshots taken during low-pressure CVD growth of graphene on copper at 1000°C. The growth and nucleation behaviour can directly be abstracted from the recorded images as shown in b).
FHI der Max-Planck-Gesellschaft Ph.D. Material Chem.
Northwest Univ. M.Sc. Inorganic and Material Chem.
Xi’an Polytechnic Univ. B.S. Applied Chem.