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Mo Atom Rearrangement Drives Layer-Dependent Reactivity in Two-Dimensional MoS2.

Zifan Wang1, Jiaxuan Wen2, Tina Mihm3

  • 1Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States.

Journal of the American Chemical Society
|September 9, 2025
PubMed
Summary
This summary is machine-generated.

The chemical reactivity of molybdenum disulfide (MoS2) during nitridation depends on its layer number. Monolayer MoS2 shows lower reactivity due to atomic rearrangement, impacting materials chemistry understanding.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials enable atomic-level control of chemical reactions.
  • Understanding structural transformations during reactions in 2D materials is crucial but underexplored.

Purpose of the Study:

  • Investigate the layer-dependent chemical reactivity of molybdenum disulfide (MoS2) during nitridation.
  • Elucidate the role of atomic rearrangement in governing reactivity.

Main Methods:

  • Atomic-resolution transmission electron microscopy (TEM) for product imaging.
  • Local conductivity mapping.
  • Analysis of nitridation atomic substitution reactions in MoS2.

Main Results:

  • MoS2 chemical reactivity decreases with fewer layers, with monolayer MoS2 being least reactive.
  • Molybdenum nitride (MoN) nanonetworks form, showing increased continuity with higher MoS2 layer numbers.
  • Reactivity is linked to the energy cost of Mo atom diffusion for forming stable MoN lattices.

Conclusions:

  • Lattice rearrangement significantly influences chemical reactivity in 2D materials.
  • MoS2 layer number dictates reactivity through atomic migration and phase stability.
  • 2D materials are promising platforms for fundamental materials chemistry research.