材料科学
过渡金属
相变
相(物质)
凝聚态物理
转化(遗传学)
作者
Hyangsook Lee,Yeonchoo Cho,Kwangsik Jeong,Taejin Park,Mirine Leem,Wonsik Ahn,Hoijoon Kim,Jung-Hwa Kim,Heegu Kim,Mann Ho Cho,Eunha Lee,Hyoungsub Kim,Sungwoo Hwang
标识
DOI:10.1016/j.mattod.2021.02.009
摘要
Abstract Although solid-state phase transformations through chemical reaction with the surrounding environment are important in the field of materials science, the atomic-level dynamics at reacting surfaces have been difficult to observe directly. Herein, we found highly ordered arrays of 1D intermediate crystals with a unique atomic configuration during the thermal sulfidation of 3D-structured MoO2 to 2D layer-structured MoS2. These arrays reveal a dimension-breaking reconstruction process (3D → 1D → 2D) as well as a unique electronic structure evolution. Theoretical calculations show that the 1D crystals have a cross-sectional structure of four transition-metal atoms arranged in a diamond shape; these are critical to the atomic layer-by-layer formation of 2D transition-metal dichalcogenides. Furthermore, electronic structure analyses reveal that the 1D intermediate crystals alter the MoO2/MoS2 contact structure from p- to n-type with increases in the number of formed MoS2 layers.
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