Ordered and Reversible Hydrogenation of Silicene

Jinglan Qiu, Huixia Fu, Yang Xu, A. I. Oreshkin, Tingna Shao, Hui Li, Sheng Meng, Lan Chen, and Kehui Wu
Phys. Rev. Lett. 114, 126101 – Published 23 March 2015
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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.

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  • Received 9 October 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.126101

© 2015 American Physical Society

Authors & Affiliations

Jinglan Qiu1, Huixia Fu1, Yang Xu1,2, A. I. Oreshkin1,3, Tingna Shao1, Hui Li1, Sheng Meng1, Lan Chen1,*, and Kehui Wu1,4,†

  • 1Institute of Physics, Chinese Academy of Science, Beijing 100190, China
  • 2Department of Physics, Yunnan University, Kunming 650091, China
  • 3Moscow State University, Department of Physics, Moscow 119992, Russian Federation
  • 4Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

  • *Corresponding author. lchen@iphy.ac.cn
  • Corresponding author. khwu@iphy.ac.cn

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Issue

Vol. 114, Iss. 12 — 27 March 2015

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