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Atomically Sharp, Closed Bilayer Phosphorene Edges by Self-Passivation

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Title
Atomically Sharp, Closed Bilayer Phosphorene Edges by Self-Passivation
Author(s)
Sol Lee; Yangjin Lee; Li Ping Ding; Kihyun Lee; Feng Ding; Kwanpyo Kim
Publication Date
2022-08
Journal
ACS NANO, v.16, no.8, pp.12822 - 12830
Publisher
AMER CHEMICAL SOC
Abstract
Two-dimensional crystals' edge structures not only influence their overall properties but also dictate their formation due to edge-mediated synthesis and etching processes. Edges must be carefully examined because they often display complex, unexpected features at the atomic scale, such as reconstruction, functionalization, and uncontrolled contamination. Here, we examine atomic-scale edge structures and uncover reconstruction behavior in bilayer phosphorene. We use in situ transmission electron microscopy (TEM) of phosphorene/graphene specimens at elevated temperatures to minimize surface contamination and reduce e-beam damage, allowing us to observe intrinsic edge configurations. The bilayer zigzag (ZZ) edge was found to be the most stable edge configuration under e-beam irradiation. Through first-principles calculations and TEM image analysis under various tilting and defocus conditions, we find that bilayer ZZ edges undergo edge reconstruction and so acquire closed, selfpassivated edge configurations. The extremely low formation energy of the closed bilayer ZZ edge and its high stability against e-beam irradiation are confirmed by first-principles calculations. Moreover, we fabricate bilayer phosphorene nanoribbons with atomically sharp closed ZZ edges. The identified bilayer ZZ edges will aid in the fundamental understanding of the synthesis, degradation, reconstruction, and applications of phosphorene and related structures.
URI
https://pr.ibs.re.kr/handle/8788114/12347
DOI
10.1021/acsnano.2c05014
ISSN
1936-0851
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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