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Surface Functionalization of Ti3C2T MXene Nanosheets with Catechols: Implication for Colloidal Processing.

James E Heckler1,2, Gregory R Neher1,2, Faisal Mehmood3,2

  • 1ARCTOS Technology Solutions, 1270 N Fairfield Road, Beavercreek, Ohio 45432-2600, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 30, 2021
PubMed
Summary

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We developed a method to functionalize two-dimensional MXene nanosheets using catechols. This surface modification improves colloidal stability and allows for further material functionalization, enhancing MXene applications.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Tailoring two-dimensional nanosheets with organic molecules is crucial for surface passivation and reactivity control.
  • MXenes (Ti3C2Tx) are promising 2D materials with diverse applications, but their surface properties require precise engineering.

Purpose of the Study:

  • To introduce catechols for functionalizing exfoliated Ti3C2Tx MXene nanosheets in colloidal suspension.
  • To investigate the binding mechanism, structural changes, and potential applications of catechol-functionalized MXenes.

Main Methods:

  • Density Functional Theory (DFT) and UV-vis spectroscopy to confirm charge-transfer complex formation.
  • X-ray diffraction (XRD) to analyze changes in interlayer spacing.
  • Raman and Atomic Force Microscopy-Infrared (AFM-IR) spectroscopy to determine binding modes.

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  • Demonstration of fluorescent dye immobilization.

    • Main Results:

    • Catechols spontaneously react with Ti3C2Tx surfaces via metal-oxygen bonds, forming a charge-transfer complex.
    • Catechol functionalization increases the interlayer spacing of Ti3C2Tx MXene sheets.
    • Successful immobilization of a fluorescent dye on the functionalized MXene surface was achieved.

    Conclusions:

    • Aqueous functionalization of MXene surfaces with catechols provides a versatile strategy for tailoring material properties.
    • This method enhances colloidal stability and introduces anchoring points for further functionalization, such as polymer brush growth.
    • The findings open avenues for developing advanced MXene-based materials with tunable characteristics.