1. Reversible H-T′ phase transition in monolayer molybdenum disulfide via electron beam assisted solid state lithiation/delithiation.
- Author
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Ji, Xujing, Wu, Chunyang, Deng, Jingfei, Li, Jixue, and Jin, Chuanhong
- Subjects
PHASE transitions ,MOLYBDENUM disulfide ,MONOMOLECULAR films ,LITHIATION ,TRANSMISSION electron microscopes - Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMDs) possess a variety of polymorphs that exhibit distinctive atomic and electronic structures and the consequent material properties. Hence, exploiting the dynamics of phase transition between different polymorphs will lay a foundation toward controlled phase engineering based applications. In this Letter, we reported a solid-state approach to realize the H to T′ transition in monolayer molybdenum disulfide in situ inside a transmission electron microscope. The release of lithium ions and the subsequent lithiation were driven by energetic electron beam irradiation, both of which in turn triggered the H to T′ phase transition of the object monolayer MoS
2 . The as-formed T′ phase domains showed a random nucleation behavior. Interestingly, the reverse process, i.e., T′ back to H phase transition, caused by prolonged e-beam illumination, was also captured in situ. During both phase transformation processes, i.e., H → T′ and T′ → H, we did not observe any large area T phase existing in monolayer MoS2 . Our results will be instructive to elucidate the microscopic mechanisms of the phase transition and should also be extendable to other 2D TMD materials. [ABSTRACT FROM AUTHOR]- Published
- 2020
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