Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves
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arXiv
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Materias: | |
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| _version_ | 1866916529905336320 |
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| author | van Efferen, Camiel Hall, Joshua Atodiresei, Nicolae Boix, Virgínia Safeer, Affan Wekking, Tobias Vinogradov, Nikolay Preobrajensk, Alexei Knudsen, Jan Fischer, Jeison Jolie, Wouter Michely, Thomas |
| author_facet | van Efferen, Camiel Hall, Joshua Atodiresei, Nicolae Boix, Virgínia Safeer, Affan Wekking, Tobias Vinogradov, Nikolay Preobrajensk, Alexei Knudsen, Jan Fischer, Jeison Jolie, Wouter Michely, Thomas |
| contents | Two new ultimately thin vanadium rich 2D materials based on VS2 are created via molecular beam epitaxy and investigated using scanning tunneling microscopy, X-ray photoemission spectroscopy and density-functional theory calculations. The controlled synthesis of stoichiometric single-layer VS2 or either of the two vanadium-rich materials is achieved by varying the sample coverage and the sulphur pressure during annealing. Through annealing of small stoichiometric single-layer VS2 islands without S pressure, S-vacancies spontaneously order in 1D arrays, giving rise to patterned adsorption. Via the comparison of density-functional theory calculations with scanning tunneling microscopy data, the atomic structure of the S-depleted phase, with a stoichiometry of V4S7, is determined. By depositing larger amounts of vanadium and sulphur, which are subsequently annealed in a S-rich atmosphere, self-intercalated ultimately thin V5S8-derived layers are obtained, which host 2x2 V-layers between sheets of VS2. We provide atomic models for the thinnest V5S8-derived structures. Finally, we use scanning tunneling spectroscopy to investigate the charge density wave observed in the 2D V5S8-derived islands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_16792 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves van Efferen, Camiel Hall, Joshua Atodiresei, Nicolae Boix, Virgínia Safeer, Affan Wekking, Tobias Vinogradov, Nikolay Preobrajensk, Alexei Knudsen, Jan Fischer, Jeison Jolie, Wouter Michely, Thomas Materials Science Mesoscale and Nanoscale Physics Two new ultimately thin vanadium rich 2D materials based on VS2 are created via molecular beam epitaxy and investigated using scanning tunneling microscopy, X-ray photoemission spectroscopy and density-functional theory calculations. The controlled synthesis of stoichiometric single-layer VS2 or either of the two vanadium-rich materials is achieved by varying the sample coverage and the sulphur pressure during annealing. Through annealing of small stoichiometric single-layer VS2 islands without S pressure, S-vacancies spontaneously order in 1D arrays, giving rise to patterned adsorption. Via the comparison of density-functional theory calculations with scanning tunneling microscopy data, the atomic structure of the S-depleted phase, with a stoichiometry of V4S7, is determined. By depositing larger amounts of vanadium and sulphur, which are subsequently annealed in a S-rich atmosphere, self-intercalated ultimately thin V5S8-derived layers are obtained, which host 2x2 V-layers between sheets of VS2. We provide atomic models for the thinnest V5S8-derived structures. Finally, we use scanning tunneling spectroscopy to investigate the charge density wave observed in the 2D V5S8-derived islands. |
| title | Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2306.16792 |