单层
材料科学
相(物质)
相图
化学气相沉积
化学物理
密度泛函理论
开尔文探针力显微镜
工作(物理)
纳米技术
结构稳定性
化学
原子力显微镜
计算化学
热力学
物理
工程类
有机化学
结构工程
作者
Weiyuan Li,Xi Huang,Qinming He,Songyou Yao,Xin Luo,Yue Zheng
出处
期刊:Nano Letters
[American Chemical Society]
日期:2025-04-29
卷期号:25 (19): 7770-7777
被引量:1
标识
DOI:10.1021/acs.nanolett.5c00679
摘要
Two-dimensional WS2 offers promising advantages for various applications due to its semiconducting 1H phase and metallic 1T phase. However, the instability of the 1T phase and the difficulty of achieving a stable phase coexistence present significant challenges. Here, we adopt the NaCl-assisted one-step chemical vapor deposition method that enables the spatial coexistence and precise control of 1H and 1T phases within monolayer WS2. The phase diagram establishes a clear correlation between precursor ratios and the structural phases of WS2. Density functional theory calculations reveal the stability difference between the 1H and the 1T phases at the electronic level. Calculated work functions are consistent with experimental Kelvin probe force microscopy, confirming the electronic properties of the heterophase interface. This work provides a scalable and efficient approach for phase engineering in WS2, with great potential for advancing optoelectronic devices and catalytic systems.
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