作者
Giuseppe Nicotra, Quentin M Ramasse, Ioannis Deretzis, Antonino La Magna, Corrado Spinella, Filippo Giannazzo
发表日期
2013/4/23
期刊
Acs Nano
卷号
7
期号
4
页码范围
3045-3052
出版商
American Chemical Society
简介
Atomic-resolution structural and spectroscopic characterization techniques (scanning transmission electron microscopy and electron energy loss spectroscopy) are combined with nanoscale electrical measurements (conductive atomic force microscopy) to study at the atomic scale the properties of graphene grown epitaxially through the controlled graphitization of a hexagonal SiC(0001) substrate by high temperature annealing. This growth technique is known to result in a pronounced electron-doping (∼1013 cm–2) of graphene, which is thought to originate from an interface carbon buffer layer strongly bound to the substrate. The scanning transmission electron microscopy analysis, carried out at an energy below the knock-on threshold for carbon to ensure no damage is imparted to the film by the electron beam, demonstrates that the buffer layer present on the planar SiC(0001) face delaminates from it on the …
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