Atom(片上系统)
图层(电子)
材料科学
化学
纳米技术
结晶学
计算机科学
嵌入式系统
作者
Shun Kashiwaya,Yonggui Shi,Jun Lu,Davide G. Sangiovanni,Grzegorz Greczyński,Martin Magnuson,Mike Andersson,Johanna Rosén,Lars Hultman
标识
DOI:10.1038/s44160-024-00518-4
摘要
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 Ti 3 C 2 from nanolaminated Ti 3 AuC 2 , initially formed by substituting Si in Ti 3 SiC 2 with Au. Ti 3 SiC 2 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 4 f 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI