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Diffusion and Surface Effects on Sodium-Promoted MoS2 Growth Observed in Operando
Jehyun Oh1, Yoonbeen Kang1, Jae Hun Seol2
1Department of Chemistry, Yonsei University, Seodaemun-Gu, Seoul, 03722, Republic of Korea.
Small Methods
|August 7, 2025
Summary
Molten metal droplets catalyze molybdenum disulfide (MoS2) growth in chemical vapor deposition (CVD) by promoting diffusion and enabling large-area fabrication. This study reveals critical insights into optimizing transition metal dichalcogenide (TMC) synthesis.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Advancing transition metal dichalcogenides (TMCs) synthesis via chemical vapor deposition (CVD) requires understanding precursor diffusion and substrate interactions.
- Direct real-time observation of these processes has been a significant challenge.
Purpose of the Study:
- To directly monitor molybdenum disulfide (MoS2) growth using real-time observation.
- To investigate the kinetics and influence of the precursor/sodium droplet eutectic (SODE) on MoS2 growth.
- To understand the role of molten metal diffusion in TMC fabrication.
Main Methods:
- In-situ monitoring of MoS2 growth.
- Kinetic analysis of growth rates.
- Density functional theory (DFT) calculations.
- Investigation of sodium droplet eutectic (SODE) behavior.
Main Results:
- SODE acts as a catalyst, migrating to promote MoS2 growth, grain translation, and rotation.
- MoS2 exhibits preferential growth on its own surface over SiO2, indicating a thermodynamic-kinetic interplay.
- Larger SODE droplets enhance grain dynamics, while submicron SODE enables uniform, large-area growth.
Conclusions:
- Molten metal diffusion is critical for growth continuity in MoS2 CVD.
- Findings provide new insights for optimizing scalable and cost-effective TMC fabrication.
- SODE's catalytic role and diffusion behavior are key to controlling MoS2 growth.
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