金の単一原子層厚のシート – LiUの研究者がゴルデンを作成(A single atom layer of gold – LiU researchers create goldene)

2024-04-16 リンショーピング大学

＜関連情報＞

• https://liu.se/en/news-item/ett-atomlager-guld-liu-forskare-skapar-gulden
• https://www.nature.com/articles/s44160-024-00518-4

金単原子層からなるゴルデンの合成 Synthesis of goldene comprising single-atom layer gold

Shun Kashiwaya,Yuchen Shi,Jun Lu,Davide G. Sangiovanni,Grzegorz Greczynski,Martin Magnuson,Mike Andersson,Johanna Rosen & Lars Hultman
Nature Synthesis  Published:16 April 2024
DOI:https://doi.org/10.1038/s44160-024-00518-4

Abstract

The synthesis of monolayer gold has so far been limited to free-standing several-atoms-thick layers, or monolayers confined on or inside templates. Here we report the exfoliation of single-atom-thick gold achieved through wet-chemically etching away Ti₃C₂ from nanolaminated Ti₃AuC₂, initially formed by substituting Si in Ti₃SiC₂ with Au. Ti₃SiC₂ is a renown MAX phase, where M is a transition metal, A is a group A element, and X is C or N. Our developed synthetic route is by a facile, scalable and hydrofluoric acid-free method. The two-dimensional layers are termed goldene. Goldene layers with roughly 9% lattice contraction compared to bulk gold are observed by electron microscopy. While ab initio molecular dynamics simulations show that two-dimensional goldene is inherently stable, experiments show some curling and agglomeration, which can be mitigated by surfactants. X-ray photoelectron spectroscopy reveals an Au 4f binding energy increase of 0.88 eV. Prospects for preparing goldene from other non-van der Waals Au-intercalated phases, including developing etching schemes, are presented.