Germanene Reformation from Oxidized Germanene on Ag(111)/Ge(111) by Vacuum Annealing.

Autor: Suzuki S; Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan., Katsube D; Cluster for Pioneering Research, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan., Yano M; Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan., Tsuda Y; Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan., Terasawa TO; Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan., Ozawa T; Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan., Fukutani K; Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan.; Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan., Kim Y; Cluster for Pioneering Research, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan., Asaoka H; Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan., Yuhara J; Department of Energy Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan., Yoshigoe A; Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan.
Jazyk: angličtina
Zdroj: Small methods [Small Methods] 2024 Sep 09, pp. e2400863. Date of Electronic Publication: 2024 Sep 09.
DOI: 10.1002/smtd.202400863
Abstrakt: For group 14 mono-elemental 2D materials, such as silicene, germanene, and stanene, oxidation is a severe problem that alters or degrades their physical properties. This study shows that the oxidized germanene on Ag(111)/Ge(111) can be reformed to germanene by simple heating ≈500 °C in a vacuum. The key reaction in reforming germanene is the desorption of GeO and GeO 2 during heating ≈350 °C. After removing surface oxygen, Ge further segregates to the surface, resulting in the reformation of germanene. The reformed germanene has the same crystal structure, a (7√7 × 7√7) R19.1° supercell with respect to Ag(111), and has equivalent high quality to that of as-grown germanene on Ag(111)/Ge(111). Even after air oxidation, germanene can be reformed by annealing in a vacuum. On the other hand, the desorption of GeO and GeO 2 at high temperatures is not suppressed in the O 2 backfilling atmosphere. This instability of oxidized germanene/Ag(111)/Ge(111) at high temperatures contributes to the ease of germanene reformation without residual oxygen. In other words, the present germanene reformation, as well as the segregation of germanene on Ag(111)/Ge(111), is a highly robust process to synthesize germanene.
(© 2024 The Author(s). Small Methods published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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