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Surface nitrided MXene sheets with outstanding electroconductivity and oxidation stability.

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Surface nitridation of two-dimensional titanium carbide (Ti3C2Tx) MXenes using ammonia gas enhances electrical conductivity and oxidation stability. This method preserves the electron-rich structure, outperforming annealing in argon gas for advanced material applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Two-dimensional Ti3C2Tx MXenes offer excellent conductivity and processability for devices.
  • Surface terminal groups (Tx) influence MXene performance and stability.
  • Understanding chemical evolution during group removal is vital for MXene applications.

Purpose of the Study:

  • Investigate the impact of chemical modification on electron transfer during terminal group removal.
  • Compare the effects of annealing Ti3C2Tx MXene in argon (Ar-MXene) versus ammonia (NH3-MXene) gas.
  • Provide fundamental insights for designing improved MXene materials.

Main Methods:

  • Annealing Ti3C2Tx MXene single sheets under argon and ammonia gas atmospheres.
  • Characterizing surface chemistry and structural changes.
  • Measuring electrical conductivity and oxidation stability via rate constants with H2O2.

Main Results:

  • Ammonia annealing leads to surface nitridation, preserving an electron-abundant Ti3C2 structure.
  • Argon annealing results in oxidation of titanium layers.
  • NH3-MXene films show double the conductivity of Ar-MXene films.
  • Surface-nitrided MXene is 13 times more stable against oxidation than Ar-MXene.

Conclusions:

  • Surface nitridation via ammonia gas is a superior method for enhancing MXene electrical conductivity and stability.
  • Preserving the electron-rich Ti3C2 structure is key to improved MXene performance.
  • This study offers critical insights for the rational design of advanced MXene materials for various applications.