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Two-Dimensional Janus MXene Inks for Versatile Functional Coatings on Arbitrary Substrates.

Mengjie Chen¹, Lulu Li¹, Zhiming Deng¹

¹State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Applied Materials & Interfaces

|January 12, 2023

Summary

Researchers developed Janus MXene inks by modifying MXene nanosheets with polystyrene. These inks offer broad substrate compatibility and enhanced stability for advanced MXene coatings and electronics.

Keywords:

Janus MXene electromagnetic interference shielding functional inks oxidation stability solution processing

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Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Solution processing of 2D nanomaterials like MXenes enables efficient fabrication of functional materials.
Formulating nonaqueous MXene inks with broad substrate affinity remains a challenge, limiting applications.

Purpose of the Study:

To develop stable, nonaqueous MXene inks for versatile substrate coating.
To enhance the practical applications of MXenes in printing and coatings.

Main Methods:

Asymmetric grafting of polystyrene onto MXene nanosheets to create Janus structures.
Concentrating flakes into additive-free Janus MXene organic inks.
Evaluating ink dispersibility, stability, and coating properties.

Main Results:

Janus MXene nanosheets exhibit dual hydrophilic and hydrophobic properties.
Inks show broad dispersibility in polar and nonpolar solvents, extending shelf life.
Uniform, firm, large-area coatings on diverse substrates with improved photothermal, chemical, and EMI shielding properties were achieved.

Conclusions:

Janus surface engineering provides a cost-effective strategy for MXene ink formulation.
This approach significantly promotes the performance and applicability of MXene-based electronics.