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Polytypic Two-Dimensional FeAs with High Anisotropy

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Title
Polytypic Two-Dimensional FeAs with High Anisotropy
Author(s)
Jongbum Won; Jihong Bae; Hyesoo Kim; Taeyoung Kim; Narguess Nemati; Sangjin Choi; Jung, Myung-Chul; Sungsoon Kim; Hong Choi; Bokyeong Kim; Dana Jin; Minjun Kim; Myung Joon Han; Jong-Young Kim; Wooyoung Shim
Publication Date
2023-12
Journal
Nano Letters, v.23, no.23, pp.11057 - 11065
Publisher
American Chemical Society
Abstract
In the realm of two-dimensional (2D) crystal growth, the chemical composition often determines the thermodynamically favored crystallographic structures. This relationship poses a challenge in synthesizing novel 2D crystals without altering their chemical elements, resulting in the rarity of achieving specific crystallographic symmetries or lattice parameters. We present 2D polymorphic FeAs crystals that completely differ from bulk orthorhombic FeAs (Pnma), differing in the stacking sequence, i.e., polytypes. Preparing polytypic FeAs outlines a strategy for independently controlling each symmetry operator, which includes the mirror plane for 2Q-FeAs (I4/mmm) and the glide plane for 1Q-FeAs (P4/nmm). As such, compared to bulk FeAs, polytypic 2D FeAs shows highly anisotropic properties such as electrical conductivity, Young’s modulus, and friction coefficient. This work represents a concept of expanding 2D crystal libraries with a given chemical composition but various crystal symmetries. © 2023 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14644
DOI
10.1021/acs.nanolett.3c03324
ISSN
1530-6984
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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