title: Ordered and reversible hydrogenation of silicene.
abstract: 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 γ-(3×3) 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.
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
authors: Jinglan
authors: J
authors: Qiu
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
authors: Huixia
authors: H
authors: Fu
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.|Department of Physics, Yunnan University, Kunming 650091, China.
authors: Yang
authors: Y
authors: Xu
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.|Moscow State University, Department of Physics, Moscow 119992, Russian Federation.
authors: A I
authors: AI
authors: Oreshkin
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
authors: Tingna
authors: T
authors: Shao
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
authors: Hui
authors: H
authors: Li
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
authors: Sheng
authors: S
authors: Meng
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
authors: Lan
authors: L
authors: Chen
authors: Institute of Physics, Chinese Academy of Science, Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors: Kehui
authors: K
authors: Wu