期刊
ACS NANO
卷 15, 期 1, 页码 1282-1290出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c08460
关键词
flash Joule heating; phase engineering; metastable; 2D materials; transition metal dichalcogenide; phase conversion
类别
资金
- Air Force Office of Scientific Research [FA9550-19-1-0296]
- DOE-NETL [DE-FE0031794]
- Department of Energy, BES [DE-SC0012547]
Controllable phase engineering is crucial for tailoring material properties, and a new electrothermal method called flash Joule heating has been developed to achieve rapid phase conversion of transition metal dichalcogenides. By controlling reaction conditions, different degrees of phase conversion can be achieved, providing a new approach for studying ratio-dependent properties.
Controllable phase engineering is vital for precisely tailoring material properties since different phase structures have various electronic states and atomic arrangements. Rapid synthesis of thermodynamically metastable materials, especially two-dimensional metastable materials, with high efficiency and low cost remains a large challenge. Here we report flash Joule heating (FJH) as an electrothermal method to achieve the bulk conversion of transition metal dichalcogenides, MoS2 and WS2, from 2H phases to 1T phases in milliseconds. The conversions can reach up to 76% of flash MoS2 using tungsten powder as conductive additive. Different degrees of phase conversion can be realized by controlling the FJH conditions, such as reaction duration and additives, which allows the study of ratio-dependent properties. First-principles calculations confirm that structural processes associated with the FJH, such as vacancy formation and charge accumulation, result in stabilization of the 1T phases. FJH offers rapid access to bulk quantities of the hitherto hard-to-access 1T phases, a promising method for further fundamental research and diverse applications of metastable phases.
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