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β-Mercaptoethanol-Enabled Long-Term Stability and Work Function Tuning of MXene.

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Summary

Researchers protected Ti3C2TX MXene from oxidation using beta-mercaptoethanol (BME). This passivation extends MXene's service life and enhances its properties for practical applications.

Keywords:
MXeneTi—S bondstabilitywork functionβ-mercaptoethanol

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • MXene materials, particularly Ti3C2TX, suffer from oxidation at edges and defects, limiting their practical use.
  • Degradation compromises the unique properties and stability of 2D MXene materials.

Purpose of the Study:

  • To develop a passivation strategy for Ti3C2TX MXene to prevent oxidation.
  • To investigate the mechanism of passivation and its effect on MXene properties and device performance.

Main Methods:

  • Passivation of Ti3C2TX MXene using beta-mercaptoethanol (BME).
  • Experimental characterization (e.g., storage tests, device fabrication).
  • Density Functional Theory (DFT) calculations to study adsorption and electronic effects.

Main Results:

  • BME effectively suppressed Ti3C2TX oxidation in aqueous dispersions, humid air, and at high temperatures.
  • BME adsorption at edges and defects was confirmed with significant binding energies.
  • Passivation maintained the 2D morphology and improved carrier transport in MoS2 field-effect transistors.

Conclusions:

  • Beta-mercaptoethanol provides an effective passivation scheme for Ti3C2TX MXene, preventing degradation.
  • The method enhances material stability without compromising intrinsic properties.
  • This approach promotes the long-term application of MXene in various electronic devices.