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Related Experiment Video

Updated: Sep 12, 2025

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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
PubMed
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.

Keywords:
diffusiongrowth kineticsmolybdenum disulfidereal‐timesubstrate

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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.