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Tuning the Sharing Modes and Composition in a Tetrahedral GeX2 (X = S, Se) System via One-Dimensional Confinement

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Title
Tuning the Sharing Modes and Composition in a Tetrahedral GeX2 (X = S, Se) System via One-Dimensional Confinement
Author(s)
Yangjin Lee; Young Woo Choi; Kihyun Lee; Chengyu Song; Peter Ercius; Marvin L. Cohen; Kwanpyo Kim; Alex Zettl
Publication Date
2023-05
Journal
ACS NANO, v.17, no.9, pp.8734 - 8742
Publisher
AMER CHEMICAL SOC
Abstract
The packing and connectivity of tetrahedral units are central themes in the structural and electronic properties of a host of solids. Here, we report one-dimensional (1D) chains of GeX2 (X = S or Se) with modification of the tetrahedral connectivity at the single-chain limit. Precise tuning of the edge-and corner-sharing modes between GeX2 blocks is achieved by diameter-dependent 1D confinement inside a carbon nanotube. Atomic-resolution scanning transmission electron microscopy directly confirms the existence of two distinct types of GeX2 chains. Density functional theory calculations corroborate the diameter-dependent stability of the system and reveal an intriguing electronic structure that sensitively depends on tetrahedral connectivity and composition. GeS2(1-x)Se2x compound chains are also realized, which demonstrate the tunability of the system's semiconducting properties through composition engineering.
URI
https://pr.ibs.re.kr/handle/8788114/13534
DOI
10.1021/acsnano.3c01968
ISSN
1936-0851
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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