Scalable and controllable synthesis of 2D high-proportion 1T-phase MoS 2
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Scalable and controllable synthesis of 2D high-proportion 1T-phase MoS2 Xiang Gao1,2, Liukang Xiong1, Jiabin Wu1, Jun Wan1, and Liang Huang1 () 1 2
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 28 February 2020 / Revised: 29 May 2020 / Accepted: 24 June 2020
ABSTRACT Two-dimensional molybdenum disulfide (2D MoS2) is considered as a promising candidate for many applications due to its unique structure and properties. However, the controllable synthesis of large-scale and high-quality 2D 1T-phase MoS2 is still a challenge. Herein, we present the scalable and controllable synthesis of 2D MoS2 from 2H to 1T@2H phase by using K2SO4 salt as a simultaneous high-temperature sulfur source and template. The as-synthesized 1T@2H-2D MoS2 exhibits a high yield and can be easily assembled into freestanding electrode with high specific capacitance of 434 F/g at a scan rate of 1 mV/s in LiClO4 ethylene carbonate/dimethyl carbonate (EC/DMC). Moreover, various single-crystal 2D transition metal sulfides (WS2, PbS, MnS and Ni9S8) and 2D S-doped carbon can be synthesized using this method. We believe that this study may provide a new sight for scalable and controllable synthesis of other 2D materials beyond 2D MoS2.
KEYWORDS two-dimensional material, MoS2, 1T phase, scalable synthesis, controllable synthesis
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Introduction
Two-dimensional molybdenum disulfide (2D MoS2) have attracted considerable attention since they exhibit a wide range of unique electrical [1, 2], optical [2], thermal [3] and mechanical properties [4] compared with their bulk counterparts. Such properties make 2D MoS2 suitable candidates for many applications, such as electronics/optoelectronics [2], sensors [5] and energystorage and conversion [6–8]. Various potential applications of the 2D MoS2 stimulate the development of different synthesis methods, which can be mainly classified into the “top-down” and “bottom-up” strategies [9–12]. The “top-down” strategy is normally the exfoliation method, which includes the physical mechanical exfoliation of their corresponding bulk layered materials [13, 14] and the chemical exfoliation of bulk layered crystals in solution assisted by mechanical sonication [6], shear force [15], and ion intercalation [16, 17]. However, structural damage of the nanosheets usually occurs due to the high-energy exfoliation process [18]. In addition, the broad distribution of sheet thickness and lateral size as well as the low yield and tendency of restacking caused by the purification process still limit its application [19]. In contrast, “bottom-up” strategies, including chemical vapor deposition (CVD) [18, 20, 21] and wet-chemistry synthesis [22], are gradually becoming another alternati
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