期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.126101
关键词
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资金
- MOST of China [2012CB921703, 2013CBA01601, 2013CB921702]
- NSF of China [11334011, 11322431, 11174344, 91121003]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB07020100]
The hydrogenation of monatomic silicene sheet on Ag(111) was studied by scanning tunneling microscopy and density functional theory calculations. It was observed that hydrogenation of silicene at room temperature results in a perfectly ordered gamma-(3 x 3) superstructure. A theoretical model, which involves seven H atoms and rearranged buckling of Si atoms, was proposed and agrees with experiments very well. Moreover, by annealing to a moderate temperature, about 450 K, a dehydrogenation process occurs and the clean silicene surface can be fully recovered. Such uniformly ordered and reversible hydrogenation may be useful for tuning the properties of silicene as well as for controllable hydrogen storage.
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