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Surface terminations on two-dimensional transition metal carbides and nitrides (MXenes) significantly impact their properties. This study reveals distinct adsorption patterns for oxygen and fluorine on Ti2C MXenes, influencing magnetic behavior and offering tunable material properties.

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Area of Science:

  • Materials Science
  • Surface Science
  • Computational Chemistry

Background:

  • Two-dimensional transition metal carbides and nitrides (MXenes) possess diverse applications.
  • Surface terminations, arising from preparation and post-processing, critically influence MXene properties.
  • Understanding termination patterns on MXene surfaces is crucial for their application.

Purpose of the Study:

  • To predict adsorption patterns of oxygen and fluorine on Ti2C MXene surfaces using density functional theory.
  • To investigate the influence of termination patterns and coverage on MXene magnetic behavior.
  • To provide guidance for modeling MXenes for electronic nanodevices.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Prediction of adsorption patterns for oxygen and fluorine on Ti2C MXene.
  • Analysis of surface coverage effects (0 ≤ x ≤ 2).

Main Results:

  • Oxygen prefers zigzag, both-side adsorption on Ti2C, forming similar vacancy patterns in O-terminated MXenes.
  • Fluorine exhibits one-side flake (island) adsorption on Ti2C and similar desorption from fluorinated MXenes.
  • Termination patterns dictate magnetic behavior: oxygen compensates locally, while fluorine enhances total magnetism.

Conclusions:

  • Distinct adsorption behaviors of oxygen and fluorine on MXenes are identified.
  • Tunable magnetic properties of MXenes can be achieved through controlled termination patterns.
  • Findings offer valuable insights for designing MXenes in electronic nanodevices.