Progress in the Study of Graphene Surfaces with Deep UV Laser PEEM System
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Recently, Nano- and Interface Catalysis Research Group (Group 502) of Dalian Institute of Chemical Physics, Chinese Academy of Sciences collaborated with the research group of Liu Zhongfan-Peng Hailin of School of Chemistry and Molecular Engineering of Peking University to use the newly developed deep ultraviolet laser photoelectron emission microscope (DUV-PEEM). With the aberration-corrected low-energy electron microscopy (AC-LEEM) system, surface morphology and surface work function of a mosaic-structured graphene prepared by modulating noisiness were confirmed, confirming that the intrinsic graphite was successfully implemented by chemical vapor deposition. Controlled growth of olefinic regions and nitrogen-doped graphene regions. This work was recently published in Nature's sub-subtitle "Nature-Communication" (Nature Commun. 2012, 3: 1280; doi: 10.1038/ncomms2286).
Graphene has potential applications in optoelectronics and other fields. The construction of PN junctions is the core of many optoelectronic device applications. Therefore, the construction of graphene optoelectronic functional devices must achieve high controllability and ensure the quality of graphene. Uniform stable doping. According to the theory of modulation and doping in material growth, the modulation and doping growth method of graphene with high mobility and controllable doping area was proposed to realize the “mosaic†structure. The scale of graphene PN junction material is prepared and used for high performance photoelectric conversion devices. Since the nitrogen doping of graphene can effectively reduce the surface work function, it has a large contrast contrast with the intrinsic graphene region in PEEM imaging, so PEEM can be used as an effective surface research method to characterize graphite with such a structure. Alkene surface.
The Dalian Institute of Nanomaterials and Interfacial Catalysis Research Group has previously used deep ultraviolet laser PEEM systems for the surface chemistry of graphene (Angew Chem Int Ed, 2012, 51, 4856; DOI: 10.1002/anie.201200413) and graphene surface structures ( Nature Commun, 2012, 3: 699; doi: 10.1038/ncomms1702) made series of progress in research. This time, they collaborated with Liu Zhongfan-Peng Hailin's research group and conducted effective research on the surface electronic structure of graphene. These work shows that PEEM can play an important role in the physical and chemical research of solid surfaces.
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