High intrinsic phase stability of ultrathin 2M WS2

Xiangye Liu, Pingting Zhang, Shiyao Wang, Yuqiang Fang, Penghui Wu, Yue Xiang, Jipeng Chen, Chendong Zhao, Xian Zhang, Wei Zhao, Junjie Wang, Fuqiang Huang and Cao Guan ()
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Xiangye Liu: Northwestern Polytechnical University
Pingting Zhang: Northwestern Polytechnical University
Shiyao Wang: Northwestern Polytechnical University
Yuqiang Fang: Chinese Academy of Sciences Shanghai
Penghui Wu: Northwestern Polytechnical University
Yue Xiang: Northwestern Polytechnical University
Jipeng Chen: Northwestern Polytechnical University
Chendong Zhao: Chinese Academy of Sciences Shanghai
Xian Zhang: China Academy of Space Technology
Wei Zhao: Chinese Academy of Sciences Shanghai
Junjie Wang: Northwestern Polytechnical University
Fuqiang Huang: Chinese Academy of Sciences Shanghai
Cao Guan: Northwestern Polytechnical University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Metallic 2M or 1T′-phase transition metal dichalcogenides (TMDs) attract increasing interests owing to their fascinating physicochemical properties, such as superconductivity, optical nonlinearity, and enhanced electrochemical activity. However, these TMDs are metastable and tend to transform to the thermodynamically stable 2H phase. In this study, through systematic investigation and theoretical simulation of phase change of 2M WS2, we demonstrate that ultrathin 2M WS2 has significantly higher intrinsic thermal stabilities than the bulk counterparts. The 2M-to-2H phase transition temperature increases from 120 °C to 210 °C in the air as thickness of WS2 is reduced from bulk to bilayer. Monolayered 1T′ WS2 can withstand temperatures up to 350 °C in the air before being oxidized, and up to 450 °C in argon atmosphere before transforming to 1H phase. The higher stability of thinner 2M WS2 is attributed to stiffened intralayer bonds, enhanced thermal conductivity and higher average barrier per layer during the layer(s)-by-layer(s) phase transition process. The observed high intrinsic phase stability can expand the practical applications of ultrathin 2M TMDs.

Date: 2024
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DOI: 10.1038/s41467-024-45676-3

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