Место издания:St Petersburg Academic University Saint Petersburg, Russia
Первая страница:270
Последняя страница:271
Аннотация:The hydrogen adsorption on monatomic silicene/Ag(111) surface was studied by scanning tunneling microscopy and density functional theory calculations. It was shown 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. A dehydrogenation process occurs at 450 K 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.