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Free-Standing Single-Atom-Thick Iron Membranes Suspended in Graphene PoresHighly Cited Paper

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Title: Free-Standing Single-Atom-Thick Iron Membranes Suspended in Graphene Pores

Author(s): Jiong Zhao; Deng, Qingming; Alicja Bachmatiuk; Sandeep, Gorantla; Popov, Alexey; Eckert, Juergen; Rummeli, Mark H.

Subject: graphene, ; iron, ; nanocrystal, ; carbon, ; crystal structure, ; image analysis, ; iron, ; magnetic property, ; membrane, ; simulation, ; substrate, ; two-dimensional modeling, ; article, ; artificial membrane, ; atom, ; density functional theory, ; electric potential, ; electron beam, ; electron energy loss spectroscopy, ; irradiation, ; magnet, ; priority journal, ; simulation, ; surface property, ; transmission electron microscopy

Abstract: The excess of surface dangling bonds makes the formation of free-standing two-dimensional (2D) metals unstable and hence difficult to achieve. To date, only a few reports have demonstrated 2D metal formation over substrates. Here, we show a free-standing crystalline single-atom-thick layer of iron (Fe) using in situ low-voltage aberration-corrected transmission electron microscopy and supporting image simulations. First-principles calculations confirm enhanced magnetic properties for single-atom-thick 2D Fe membranes. This work could pave the way for new 2D structures to be formed in graphene membranes.