Solid-state reaction as a mechanism of 1T &[LEFT RIGHT ARROW]; 2H transformation in MoS2 monolayers


Monolayers of molybdenum disulfide MoS2 are considered to be prospective materials for nanoelectronics and various catalytic processes. Since in certain conditions they undergo 1T ↔ 2H phase transitions, studying these phase changes is an urgent task. We present a DFT research of these transitions to show that they can proceed as a solid-state reaction. Two transition states were discovered with energy barriers 1.03 and 1.40 eV. Sulfur atoms in the transition states are shown to be displaced relative to molybdenum atoms so that a tendency of one structural modification to transform into the other modification is seen. This kind of displacements agrees with electron microscopy data reported earlier. The energy parameters indicate that 1T → 2H reactions are exothermic for both transition states and can possibly proceed in a self-sustained manner when initially activated by some external energy impact.

DOI: 10.1002/jcc.24188

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@article{Rizhikov2015SolidstateRA, title={Solid-state reaction as a mechanism of 1T &[LEFT RIGHT ARROW]; 2H transformation in MoS2 monolayers}, author={Maxim R. Rizhikov and Vladimir A. Slepkov and Svetlana G. Kozlova and Svyatoslav P. Gabuda and Vladimir E. Fedorov}, journal={Journal of computational chemistry}, year={2015}, volume={36 28}, pages={2131-4} }