Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2
Abstract The layered dichalcogenide MoS $$_{2}$$ 2 is relevant for electrochemical Li adsorption/intercalation, in the course of which the material undergoes a concomitant structural phase transition from semiconducting 2H-MoS $$_{2}$$ 2 to metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 . With th...
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2021
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oai:doaj.org-article:622e1a9ab82348c59f77e22d7c2fc6292021-12-02T16:35:56ZDirectional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 210.1038/s41598-021-86364-22045-2322https://doaj.org/article/622e1a9ab82348c59f77e22d7c2fc6292021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86364-2https://doaj.org/toc/2045-2322Abstract The layered dichalcogenide MoS $$_{2}$$ 2 is relevant for electrochemical Li adsorption/intercalation, in the course of which the material undergoes a concomitant structural phase transition from semiconducting 2H-MoS $$_{2}$$ 2 to metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 . With the core hole clock approach at the S L $$_{1}$$ 1 X-ray absorption edge we quantify the ultrafast directional charge transfer of excited S3p electrons in-plane ( $$\parallel$$ ‖ ) and out-of-plane ( $$\perp$$ ⊥ ) for 2H-MoS $$_{2}$$ 2 as $$\tau _{2H,\parallel } = 0.38 \pm 0.08$$ τ 2 H , ‖ = 0.38 ± 0.08 fs and $$\tau _{2H,\perp } = 0.33 \pm 0.06$$ τ 2 H , ⊥ = 0.33 ± 0.06 fs and for 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 as $$\tau _{1T,\parallel } = 0.32 \pm 0.12$$ τ 1 T , ‖ = 0.32 ± 0.12 fs and $$\tau _{1T,\perp } = 0.09 \pm 0.07$$ τ 1 T , ⊥ = 0.09 ± 0.07 fs. The isotropic charge delocalization of S3p electrons in the semiconducting 2H phase within the S-Mo-S sheets is assigned to the specific symmetry of the Mo-S bonding arrangement. Formation of 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 by lithiation accelerates the in-plane charge transfer by a factor of $$\sim 1.2$$ ∼ 1.2 due to electron injection to the Mo-S covalent bonds and concomitant structural repositioning of S atoms within the S-Mo-S sheets. For excitation into out-of-plane orbitals, an accelerated charge transfer by a factor of $$\sim 3.7$$ ∼ 3.7 upon lithiation occurs due to S-Li coupling.Robert HaverkampNomi L. A. N. SorgenfreiErika GiangrisostomiStefan NepplDanilo KühnAlexander FöhlischNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021) |
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Medicine R Science Q Robert Haverkamp Nomi L. A. N. Sorgenfrei Erika Giangrisostomi Stefan Neppl Danilo Kühn Alexander Föhlisch Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 |
| description |
Abstract The layered dichalcogenide MoS $$_{2}$$ 2 is relevant for electrochemical Li adsorption/intercalation, in the course of which the material undergoes a concomitant structural phase transition from semiconducting 2H-MoS $$_{2}$$ 2 to metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 . With the core hole clock approach at the S L $$_{1}$$ 1 X-ray absorption edge we quantify the ultrafast directional charge transfer of excited S3p electrons in-plane ( $$\parallel$$ ‖ ) and out-of-plane ( $$\perp$$ ⊥ ) for 2H-MoS $$_{2}$$ 2 as $$\tau _{2H,\parallel } = 0.38 \pm 0.08$$ τ 2 H , ‖ = 0.38 ± 0.08 fs and $$\tau _{2H,\perp } = 0.33 \pm 0.06$$ τ 2 H , ⊥ = 0.33 ± 0.06 fs and for 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 as $$\tau _{1T,\parallel } = 0.32 \pm 0.12$$ τ 1 T , ‖ = 0.32 ± 0.12 fs and $$\tau _{1T,\perp } = 0.09 \pm 0.07$$ τ 1 T , ⊥ = 0.09 ± 0.07 fs. The isotropic charge delocalization of S3p electrons in the semiconducting 2H phase within the S-Mo-S sheets is assigned to the specific symmetry of the Mo-S bonding arrangement. Formation of 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 by lithiation accelerates the in-plane charge transfer by a factor of $$\sim 1.2$$ ∼ 1.2 due to electron injection to the Mo-S covalent bonds and concomitant structural repositioning of S atoms within the S-Mo-S sheets. For excitation into out-of-plane orbitals, an accelerated charge transfer by a factor of $$\sim 3.7$$ ∼ 3.7 upon lithiation occurs due to S-Li coupling. |
| format |
article |
| author |
Robert Haverkamp Nomi L. A. N. Sorgenfrei Erika Giangrisostomi Stefan Neppl Danilo Kühn Alexander Föhlisch |
| author_facet |
Robert Haverkamp Nomi L. A. N. Sorgenfrei Erika Giangrisostomi Stefan Neppl Danilo Kühn Alexander Föhlisch |
| author_sort |
Robert Haverkamp |
| title |
Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 |
| title_short |
Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 |
| title_full |
Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 |
| title_fullStr |
Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 |
| title_full_unstemmed |
Directional charge delocalization dynamics in semiconducting 2H-MoS $$_{2}$$ 2 and metallic 1T-Li $$_{\mathrm{x}}$$ x MoS $$_{2}$$ 2 |
| title_sort |
directional charge delocalization dynamics in semiconducting 2h-mos $$_{2}$$ 2 and metallic 1t-li $$_{\mathrm{x}}$$ x mos $$_{2}$$ 2 |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/622e1a9ab82348c59f77e22d7c2fc629 |
| work_keys_str_mv |
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