德国马普所王竹君博士6月6日上午学术报告

发布时间:2014-06-03访问量:133设置

报告人:王竹君博士

 

                                                           Department of Inorganic Chemistry,

                                                  Fritz Haber Institute of the Max Planck Society,

                                                                          Berlin, Germany

 

题目:In-situ observation of graphene growth dynamics by environmental scanning electron microscopy

时间:201466(星期五)上午1000

地点:909号楼一楼B会议室(Conference Room B, 909-1F)

 

摘要:

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 1a) 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).

 


个人简介:

Education

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.

 

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