2024-03-29T00:43:45Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00027210
2023-01-16T04:18:32Z
320:321:322
Germanene Epitaxial Growth by Segregation through Ag(111) Thin Films on Ge(111)
Yuhara, Junji
Shimazu, Hiroki
Ito, Kouichi
Ohta, Akio
Araidai, Masaaki
Kurosawa, Masashi
Nakatake, Masashi
Le Lay, Guy
open access
“This document is the Accepted Manuscript version of a Published Work that appeared in final form in [ACS Nano], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [https://pubs.acs.org/articlesonrequest/AOR-BFQ8ec6eR4WmkSpgagAs].”
core-level spectroscopy
germanene
germanium
scanning tunneling microscopy
segregation method
silver
two-dimensional sheet
Large-scale two-dimensional sheets of graphene-like germanium, namely, germanene, have been epitaxially prepared on Ag(111) thin films grown on Ge(111), using a segregation method, differing from molecular beam epitaxy used in previous reports. From the scanning tunneling microscopy (STM) images, the surface is completely covered with an atom-thin layer showing a highly ordered long-range superstructure in wide scale. Two types of protrusions, named hexagon and line, form a (7√7 × 7√7)R19.1° supercell with respect to Ag(111), with a very large periodicity of 5.35 nm. Auger electron spectroscopy and high-resolution synchrotron radiation photoemission spectroscopy demonstrate that Ge atoms are segregated on the Ag(111) surface as an overlayer. Low-energy electron diffraction clearly shows incommensurate “(1.35 × 1.35)”R30° spots, corresponding to a lattice constant of 0.39 nm, in perfect accord with close-up STM images, which clearly reveal an internal honeycomb arrangement with corresponding parameter and low buckling within 0.01 nm. As this 0.39 nm value is in good agreement with the theoretical lattice constant of free-standing germanene, conclusively, the segregated Ge atoms with trivalent bonding in honeycomb configuration form a characteristic two-dimensional germanene-like structure.
ファイル公開:2019-11-27
ACS Publications
2018-11-27
eng
journal article
AM
http://hdl.handle.net/2237/00029409
https://nagoya.repo.nii.ac.jp/records/27210
https://doi.org/10.1021/acsnano.8b07006
1936-0851
1936-086X
ACS Nano
12
11
11632
11637
https://nagoya.repo.nii.ac.jp/record/27210/files/2018_J_Yuhara_Germanene_on_Ag111.pdf
application/pdf
6.6 MB
2019-11-27