Tuning the Electronic Properties of Rotated Graphene on Ni(111) by Nickel Carbide Intercalation

被引：7
|
作者：
Song, Jiaming [1 ]
Bernien, Matthias [1 ]
Wu, Chii-Bin [1 ,2 ]
Kuch, Wolfgang [1 ]
机构：
[1] Free Univ Berlin, Inst Expt Phys, Arnimallee 14, D-14195 Berlin, Germany
[2] Christian Univ, Dept Phys, Chungli 32023, Taiwan
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2016年 / 120卷 / 03期
关键词：
SCANNING-TUNNELING-MICROSCOPY; EPITAXIAL GRAPHENE; GRAPHITE; MOIRE; MONOLAYER; BOUNDARIES; OXYGEN; ADSORPTION; INTERFACES; PATTERNS;
D O I：
10.1021/acs.jpcc.5b10017
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
High-temperature-deposited rotated graphene (Gr) on Ni(111) has been investigated by in situ scanning tunneling microscopy and spectroscopy at room temperature. The rotated Gr exhibits weak bonding to the Ni(111) surface, which facilitates formation of Ni2C or a second Gr layer underneath via bulk carbon segregation. Areas of rotated Gr present a bias voltage dependence of the apparent amplitude of Gr superlattice corrugations. We find that Ni2C underneath rotated Gr introduces additional electronic features that vary with the gap resistance, which could be related to an orientation-dependent interaction between Ni2C and Gr. Furthermore, the exposure to oxygen has a significant influence on the local density of states of Gr/Ni2C, other than on Ni(111) covered with nonrotated Gr.
引用
收藏
页码：1546 / 1555
页数：10
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