Tuning the Sharing Modes and Composition in a Tetrahedral GeX<sub>2</sub> (X = S, Se) System via One-Dimensional Confinement.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37127288.
- Also identified by DOI 10.1021/acsnano.3c01968 and PMC identifier 10173682.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 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 microscopy directly confirms the existence of two distinct types of GeX<sub>2</sub> 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. GeS<sub>2(1-<i>x</i>)</sub>Se<sub>2<i>x</i></sub> compound chains are also realized, which demonstrate the tunability of the system's semiconducting properties through composition engineering.