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)

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2024-04-16 リンショーピング大学

科学者が初めて金の単一原子層厚のシートを作成し、金の新しい特性「goldene」を開発。これは二酸化炭素変換や水素生成などの用途に適し、従来の金の使用量を大幅に削減できる可能性がある。成功の鍵は、日本の鍛冶師が使う古い方法を用いたこと。この成果はスウェーデンのリンシェーピング大学の研究者によるもので、今後は他の貴金属にも応用可能性を探る。

<関連情報>

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.

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)

0501セラミックス及び無機化学製品0705金属加工
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