Polymorphic Phases of Metal Chlorides in the Confined 2D Space of Bilayer Graphene
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-12-29
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en
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8
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Advanced Materials, Volume 33, issue 52
Abstract
Unprecedented 2D metal chloride structures are grown between sheets of bilayer graphene through intercalation of metal and chlorine atoms. Numerous spatially confined 2D phases of AlCl3 and CuCl2 distinct from their typical bulk forms are found, and the transformations between these new phases under the electron beam are directly observed by in situ scanning transmission electron microscopy (STEM). The density functional theory calculations confirm the metastability of the atomic structures derived from the STEM experiments and provide insights into the electronic properties of the phases, which range from insulators to semimetals. Additionally, the co-intercalation of different metal chlorides is found to create completely new hybrid systems; in-plane quasi-1D AlCl3/CuCl2 heterostructures are obtained. The existence of polymorphic phases hints at the unique possibilities for fabricating new types of 2D materials with diverse electronic properties confined between graphene sheets.Description
Funding Information: Y.‐C.L. and K.S. acknowledge JSPS‐KAKENHI (JP16H06333 and 18K14119), the JST‐CREST program (JPMJCR20B1, JMJCR20B5, and JPMJCR1993), the JSPS A3 Foresight Program, and the Kazato Research Encouragement Prize. H.A. acknowledges JSPS‐KAKENHI (18H03864 and 19K22113) and the JST‐CREST program (JPMJCR20B1). A.V.K. thanks the German Research Foundation (DFG; project KR 4866/2‐1) for support. The authors thank HRLS Stuttgart, Germany, TU Dresden (Taurus cluster), and CSC Finland for generously providing computing time. The authors acknowledge Dr. Pablo Solís‐Fernández and Prof. Rika Matsumoto for providing high‐quality BLG and facilitating valuable discussions. Publisher Copyright: © 2021 Wiley-VCH GmbH
Keywords
EELS, graphene intercalation, metal chloride, phase transitions
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Lin , Y C , Motoyama , A , Kretschmer , S , Ghaderzadeh , S , Ghorbani-Asl , M , Araki , Y , Krasheninnikov , A V , Ago , H & Suenaga , K 2021 , ' Polymorphic Phases of Metal Chlorides in the Confined 2D Space of Bilayer Graphene ' , Advanced Materials , vol. 33 , no. 52 , 2105898 . https://doi.org/10.1002/adma.202105898