Two-Dimensional GeSe as an Isostructural and Isoelectronic Analogue of Phosphorene: Sonication-Assisted Synthesis, Chemical Stability, and Optical Properties
| Autor: | Junjie Wang, Yuting Ye, Jianrong Qiu, Qiangbing Guo, Xiaofeng Liu, Chang Liu, Yi Liu |
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| Rok vydání: | 2017 |
| Předmět: |
Potential well
Materials science Band gap General Chemical Engineering Analytical chemistry chemistry.chemical_element Mineralogy Germanium 02 engineering and technology General Chemistry Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint 0104 chemical sciences Phosphorene chemistry.chemical_compound chemistry Materials Chemistry Isostructural 0210 nano-technology Tin |
| Zdroj: | Chemistry of Materials. 29:8361-8368 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.7b02784 |
| Popis: | Monochalcogenides of germanium (or tin) are considered as isoelectronic and isostructural analogues of black phosphorus. Here, we demonstrate the synthesis of atomically thin GeSe by direct sonication-assisted liquid phase exfoliation (LPE) of bulk microcrystalline powders in organic solvents. The thickness of the GeSe sheets is dependent on the exfoliation conditions, and highly crystalline few-layer GeSe sheets of 4–10 layer stacks with lateral sizes over 200 nm were obtained. In ambient atmosphere, the LPE sheets deposited on the substrate demonstrate strong resistance against degradation, while decomposition into elemental Ge and Se nanostructures occurs at a moderate rate for ethanol dispersions. Density functional theory calculation together with optical characterizations confirm the blue-shifted bandgap for the GeSe sheets as a result of strong quantum confinement effect. In addition, we show that the few-layer GeSe sheets with favorable optical bandgap allow for efficient solar light harvesting fo... |
| Databáze: | OpenAIRE |
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