Synthesis and characterization of two-dimensional Nb4C3 (MXene)

Area of Science:

• Materials Science
• Solid-State Chemistry
• Nanotechnology

Background:

• Two-dimensional (2D) transition metal carbides, known as MXenes, are emerging materials with unique properties.
• MXenes with M4X3 stoichiometry are rare, limiting the exploration of their potential applications.
• Developing scalable synthesis methods for new MXene phases is crucial for materials innovation.

Purpose of the Study:

• To report the synthesis of a phase-pure M4X3 MXene, specifically niobium carbide (Nb4C3).
• To characterize the structure of the synthesized Nb4C3 MXene.
• To evaluate the electrical conductivity of the novel material.

Main Methods:

• Synthesis of Nb4C3 by etching Nb4AlC3 powders in hydrofluoric acid.
• Structural investigation using pair distribution function (PDF) analysis.
• Measurement of electrical resistivity on a cold-pressed Nb4C3 disc.

Main Results:

• Successful synthesis of phase-pure 2D Nb4C3.
• Detailed structural information obtained through PDF analysis.
• Observed resistivity of 0.0046 Ω m, indicating high electrical conductivity.

Conclusions:

• Nb4C3 represents a new, synthetically accessible M4X3 MXene.
• The high conductivity of Nb4C3 positions it as a promising material for electronic devices.
• This work expands the library of known MXenes and highlights their potential in advanced applications.