| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Storm, Alexander
University of Ulm
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2024Phase transformations in single-layer MoTe2 stimulated by electron irradiation and annealingcitations
- 2024Characterization of freestanding few-layer transition metal phosphorus trichalcogenides studied by low-voltage analytical transmission electron microscopy
- 2023Phase transformations in single-layer MoTe<sub>2</sub> stimulated by electron irradiation and annealingcitations
- 2022Structural and Chemical Modifications of Few-Layer Transition Metal Phosphorous Trisulfides by Electron Irradiationcitations
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article
Phase transformations in single-layer MoTe<sub>2</sub> stimulated by electron irradiation and annealing
Abstract
<jats:title>Abstract</jats:title><jats:p>Among two-dimensional (2D) transition metal dichalcogenides (TMDs), MoTe<jats:sub>2</jats:sub> is predestined for phase-engineering applications due to the small difference in free energy between the semiconducting H-phase and metallic 1T′-phase. At the same time, the complete picture of the phase evolution originating from point defects in single-layer of semiconducting H-MoTe<jats:sub>2</jats:sub> via Mo<jats:sub>6</jats:sub>Te<jats:sub>6</jats:sub> nanowires to cubic molybdenum has not yet been reported so far, and it is the topic of the present study.&#xD;The occurring phase transformations in single-layer H-MoTe<jats:sub>2</jats:sub> were initiated by 40-80 kV electrons in the spherical and chromatic aberration-corrected high-resolution transmission electron microscope and/or when subjected to high temperatures.&#xD;We analyse the damage cross-section at voltages between 40-80 kV and relate the results to previously published values for other TMDs. Then we demonstrate that electron beam irradiation offers a route to locally transform freestanding single-layer H-MoTe<jats:sub>2</jats:sub> into one-dimensional (1D) Mo<jats:sub>6</jats:sub>Te<jats:sub>6</jats:sub> nanowires. Combining the experimental data with the results of first-principles calculations, we explain the transformations in MoTe<jats:sub>2</jats:sub> single-layers and Mo<jats:sub>6</jats:sub>Te<jats:sub>6</jats:sub> nanowires by an interplay of electron-beam-induced energy transfer, atom ejection, and oxygen absorption. Further, the effects emerging from electron irradiation are compared with those produced by in situ annealing in a vacuum until pure molybdenum crystals are obtained at temperatures of about 1000°C. A detailed understanding of high-temperature solid-to-solid phase transformation in the 2D limit can provide insights into the applicability of this material for future device fabrication.&#xD;</jats:p>