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

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.

SUBMITTER: Lee Y 

PROVIDER: S-EPMC10173682 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Tuning the Sharing Modes and Composition in a Tetrahedral GeX<sub>2</sub> (X = S, Se) System via One-Dimensional Confinement.

Lee Yangjin Y   Choi Young Woo YW   Lee Kihyun K   Song Chengyu C   Ercius Peter P   Cohen Marvin L ML   Kim Kwanpyo K   Zettl Alex A  

ACS nano 20230426 9

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 GeX<sub>2</sub> (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 GeX<sub>2</sub> blocks is achieved by diameter-dependent 1D confinement inside a carbon nanotube. Atomic-resolution scanning transmission electron micr  ...[more]

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