Hydrogenation of segregated germanene on Ag(111)/Ge(111) by atomic hydrogen

鈴木 誠也   ; 小澤 孝拓*; 植田 寛和   ; 福谷 克之

Suzuki, Seiya; Ozawa, Takahiro*; Ueta, Hirokazu; Fukutani, Katsuyuki

Germanene, a graphene-like atomic sheet of Ge, has attracted immense attention owing to its theoretically predicted outstanding 2D topological properties. However, because of its chemical instability, electronic devices of germanene have not yet been reported. As one approach, hydrogenation is expected to increase the chemical stability of germanene, leading to the realization of germanene electronic devices. Here, we report on the direct hydrogenation of germanene by atomic hydrogen exposure. The germanene sample was prepared by the segregation method on a Ag(111)/Ge(111) substrate. The atomic hydrogen was generated by cracking of H molecules with a hot tungsten filament. We have studied the hydrogenation of germanene by fourier transform infrared (FT-IR) spectroscopy, themal desorption spectroscopy, and low energy electron diffraction.