Researchers from the Nano and Interface Catalysis Group (Group 502) of Dalian Institute of Chemical Physics (Group 502), such as Jin Li, Fu Qiang, and Bao Xinhe, cooperated with the research team led by researcher Cheng Huiming from the Institute of Metal Research, using the newly developed deep ultraviolet laser photoelectron emission from this group. The microscope (DUV-PEEM) system studied the growth process and structure of single-layer graphene.

　　Recently, researchers from the Nano and Interfacial Catalysis Research Group (Group 502) of Dalian Institute of Chemical Physics, including Jin Li, Fu Qiang, and Bao Xinhe, cooperated with a research group led by researcher Cheng Huiming from the Institute of Metals, using the newly developed deep-ultraviolet laser. The photoelectron emission microscope (DUV-PEEM) system studied the growth process and structure of single-layer graphene, and successfully discovered that in the millimeter-sized single-layer graphene grown by chemical vapor deposition (CVD) on the surface of Pt, Graphene sheets with concave-angle boundaries have a polycrystalline structure and have different crystal lattice orientations, while graphene sheets with only convex-angle boundaries have a perfect single-crystal structure. As an important criterion, this method confirms that large-area, single-layer, single-crystal graphene can be obtained by the CVD method. The results were recently published on Nature Communications (Nat.Commun.3:699doi:10.1038/ncomms1702(2012)).

　　The development of our deep-ultraviolet laser light emission electron microscope (PEEM) is an important achievement obtained under the funding of a major national scientific research equipment development project ("Deep ultraviolet all-solid-state laser source major scientific research equipment"). It is the first time in the world to use deep ultraviolet laser as Excitation light source, successfully obtained high spatial resolution PEEM images (resolution <5nm), and equipped with a field emission electron gun, to achieve the functions of low energy electron microscopy (LEEM) and low energy electron diffraction (LEED), which can chemically and shape the solid surface In-situ dynamic characterization of appearance and structure.