Nitrogen-Doped Graphene on Copper: Edge-Guided Doping Process and Doping-Induced Variation of Local Work Function
Nitrogen-Doped Graphene on Copper: Edge-Guided Doping Process and Doping-Induced Variation of Local Work Function
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DOI：
10.1021/acs.jpcc.8b11261
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
J. Neilson;Harutiun Chinkezian;H. Phirke;Alexander Osei-Twumasi;Yanbang Li;Carlos Chichiri;Jongweon Cho;K. Palotás;L. Gan;S. Garrett;K. Lau;Li Gao
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文献类型：
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作者：
J. Neilson;Harutiun Chinkezian;H. Phirke;Alexander Osei-Twumasi;Yanbang Li;Carlos Chichiri;Jongweon Cho;K. Palotás;L. Gan;S. Garrett;K. Lau;Li Gao
以氮杂富勒烯为唯一前驱体，在铜表面制备了氮掺杂单层石墨烯。结合扫描隧道显微镜/光谱、X射线光电子能谱测量和密度泛函理论计算，在原子尺度上研究了石墨烯的合成过程、掺杂性质以及掺杂引起的局域功函数的变化.大多数氮掺杂剂位于石墨烯岛的边缘和具有吡啶构型的石墨烯域边界处。石墨氮掺杂剂在多个生长周期后在石墨烯岛内排列成曲线，这是由石墨烯岛的边缘引导的掺杂过程引起的。利用扫描隧道光谱技术在原子尺度上测量了掺杂引起的石墨烯表面局域功函数的变化。我们发现局域功函数强烈依赖于原子的成键构型。
The synthesis of nitrogen-doped single-layer graphene has been achieved on the copper surface by using the nitrogen-containing sole precursor azafullerene. The synthesis process, doping properties, and doping-induced variation of local work function of graphene have been investigated on the atomic scale by combining scanning tunneling microscopy/spectroscopy, X-ray photoelectron spectroscopy measurements, and density functional theory calculations. Most nitrogen dopants are at the edges of graphene islands and the graphene domain boundaries with the pyridinic configuration. Graphitic nitrogen dopants arrange into curved lines within graphene islands after multiple growth cycles, which results from a doping process guided by the edges of graphene islands. The doping-induced variation of local work function of the graphene surface has been measured on the atomic scale by using scanning tunneling spectroscopy measurements. We find that the local work function strongly depends on the atomic bonding configurat...