One-step Efficient Preparation of Unconventional Phase of Transition Metal Dichalcogenides
Knowledge Transfer Office, City University of Hong Kong
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The phases of transition-metal dichalcogenides (TMDs) play an important role in determining the intrinsic properties of TMDs, and thus their various applications. For example, TMDs with unconventional metastable phases (e.g., 1T and 1T′) have novel physical and chemical properties and hold great potential applications in electronic devices, energy storage and conversion, catalysts, and condensed matter physics. Meanwhile, most of the known methods to prepare metastable-phase TMDs require either harsh conditions or destructive treatment, resulting in damages and defects on TMDs during the preparation process, which are not suitable for the large-scale production of high-quality metastable-phase TMDs. The large-scale preparation of metastable-phase TMDs with high quality and purity remains challenging. The present invention offers a simple, universal, and controlled method for the preparation of large-scale and high-purity unconventional-phase TMDs from the easily accessible and low-cost 2H-phase TMDs and alkali metal, which will benefit the research on the fundamental study of these unconventional-phase TMDs and the phase-dependent applications.
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