Salt-Assisted 2H-to-1T' Phase Transformation of Transition Metal Dichalcogenides [plus supplemental information]
[1]
- City Univ. of Hong Kong, Kowloon (Hong Kong)
- Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Chinese Academy of Sciences (CAS), Beijing (China); Yangtze River Delta Physics Research Center Co. Ltd Liyang (China)
- The Hong Kong Polytechnic University (China)
- Chinese Academy of Sciences (CAS), Beijing (China)
- National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
Abstract Phase engineering of nanomaterials (PEN) has demonstrated great potential in the fields of catalysis, electronics, energy storage and conversion, and condensed matter physics. Recently, transition metal dichalcogenides (TMDs) with unconventional metastable phases (e.g., 1T and 1T′) have attracted increasing research interest due to their unique and appealing physicochemical properties. However, there is still a lack of a simple, universal, and controlled method for the preparation of large‐scale and high‐purity unconventional‐phase TMD crystals, restricting their further fundamental study and practical applications. Here, a facile, one‐step salt‐assisted general strategy is reported for the controlled phase transformation of commercially available TMDs with conventional 2H phase, yielding a large amount of metastable 1T′‐phase TMDs, including WS 2 , WSe 2 , MoS 2 , and MoSe 2 . It is found that the easily accessible metal salts, such as K 2 C 2 O 4 ·H 2 O, K 2 CO 3 , Na 2 CO 3 , Rb 2 CO 3 , Cs 2 CO 3 , KHCO 3 , NaHCO 3 , and NaC 2 O 4 , can be used to assist the 2H‐to‐1T′ phase transformation, greatly simplifying the synthetic process for producing metastable 1T′‐TMDs. Importantly, this method can also be used to prepare 1T′‐TMD alloys, such as 1T′‐WS 2 x Se 2(1− x ) . This newly developed strategy is robust and highly effective, which can also be used for the phase engineering of other materials with various polymorphs.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Research Grants Council (RGC)
- Grant/Contract Number:
- SC0012704; AoE/P-701/20; JCYJ20200109143412311; SGDX2020110309300301; SRFS2122-5S04
- OSTI ID:
- 1887531
- Alternate ID(s):
- OSTI ID: 1869325
- Report Number(s):
- BNL-223295-2022-JAAM
- Journal Information:
- Advanced Materials, Vol. 34, Issue 26; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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