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A library of atomically thin metal chalcogenides

五元 熔点 过渡金属 三元运算 材料科学 单层 氧化物 纳米技术 盐(化学) 陶瓷 化学工程 超导电性 金属 无机化学 化学 催化作用 冶金 物理化学 合金 有机化学 复合材料 计算机科学 物理 量子力学 程序设计语言 工程类
作者
Jiadong Zhou,Junhao Lin,Xiangwei Huang,Yao Zhou,Yu Chen,Juan Xia,Hong Wang,Yu Xie,Huimei Yu,Jincheng Lei,Di Wu,Fucai Liu,Qundong Fu,Qingsheng Zeng,Chuang‐Han Hsu,Changli Yang,Li Lü,Ting Yu,Zexiang Shen,Hsin Lin
出处
期刊:Nature [Nature Portfolio]
卷期号:556 (7701): 355-359 被引量:1495
标识
DOI:10.1038/s41586-018-0008-3
摘要

Investigations of two-dimensional transition-metal chalcogenides (TMCs) have recently revealed interesting physical phenomena, including the quantum spin Hall effect1,2, valley polarization3,4 and two-dimensional superconductivity5, suggesting potential applications for functional devices6–10. However, of the numerous compounds available, only a handful, such as Mo- and W-based TMCs, have been synthesized, typically via sulfurization11–15, selenization16,17 and tellurization18 of metals and metal compounds. Many TMCs are difficult to produce because of the high melting points of their metal and metal oxide precursors. Molten-salt-assisted methods have been used to produce ceramic powders at relatively low temperature19 and this approach20 was recently employed to facilitate the growth of monolayer WS2 and WSe2. Here we demonstrate that molten-salt-assisted chemical vapour deposition can be broadly applied for the synthesis of a wide variety of two-dimensional (atomically thin) TMCs. We synthesized 47 compounds, including 32 binary compounds (based on the transition metals Ti, Zr, Hf, V, Nb, Ta, Mo, W, Re, Pt, Pd and Fe), 13 alloys (including 11 ternary, one quaternary and one quinary), and two heterostructured compounds. We elaborate how the salt decreases the melting point of the reactants and facilitates the formation of intermediate products, increasing the overall reaction rate. Most of the synthesized materials in our library are useful, as supported by evidence of superconductivity in our monolayer NbSe2 and MoTe2 samples21,22 and of high mobilities in MoS2 and ReS2. Although the quality of some of the materials still requires development, our work opens up opportunities for studying the properties and potential application of a wide variety of two-dimensional TMCs. Molten-salt-assisted chemical vapour deposition is used to synthesize a wide variety of two-dimensional transition-metal chalcogenides.
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