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Stability of Subnanometer MoS Wires under a Realistic Environment.

Dominike A P de Deus1, Daniel F Souza2, Andréia L da Rosa3,4

  • 1Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro, Campus Avançado Uberaba - Parque Tecnológico, Univerdecidade, Uberaba38064-190, Minas Gerais, Brazil.

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Molybdenum disulfide (MoS) nanowires show robustness against hydrogen adsorption but can oxidize with a low energy barrier. Their metallic character remains unchanged after interaction with these gases, offering insights into their environmental behavior.

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Area of Science:

  • Materials Science
  • Surface Science
  • Computational Chemistry

Background:

  • Low-dimensional structures like molybdenum disulfide (MoS) nanowires are crucial in applications such as catalysis and energy storage.
  • Understanding their interaction with small molecules is essential for optimizing these technologies.

Purpose of the Study:

  • To investigate the adsorption and diffusion of hydrogen and oxygen on subnanometer MoS nanowires.
  • To determine the impact of gas interaction on the structural and electronic properties of MoS nanowires.

Main Methods:

  • First-principles density functional theory (DFT) calculations were employed.
  • Simulations focused on hydrogen and oxygen adsorption and diffusion dynamics on MoS nanowires.

Main Results:

  • MoS nanowires exhibit high stability against hydrogen adsorption.
  • A low oxidation barrier (0.20 eV) was observed for oxygen interaction.
  • Adsorption of hydrogen or oxygen did not alter the metallic nature of the nanowires.
  • The singlet state was identified as the most stable configuration for adsorbed O2.

Conclusions:

  • MoS nanowires demonstrate resistance to hydrogen but susceptibility to oxidation.
  • The electronic properties remain stable under gas exposure, suggesting potential for applications in reactive environments.
  • These findings provide a foundation for predicting MoS nanowire behavior in practical settings.