Overcoming Stability and Substrate Adhesion Challenges by Laser-Induced Transfer of MXenes

Area of Science:

• Materials Science
• Nanotechnology
• Surface Engineering

Background:

• MXenes offer metallic conductivity and solution processability but suffer from poor substrate adhesion and air instability, limiting practical applications.
• Existing stabilization methods like doping or lamination can negatively impact electrical conductivity.
• Oxidation of MXenes leads to degradation, hindering their use in electronic devices.

Purpose of the Study:

• To develop a single-step process for simultaneously enhancing MXene adhesion and chemical stability.
• To engineer the MXene-substrate interface for improved performance in electronic applications.
• To address the limitations of conventional stabilization techniques for MXenes.

Main Methods:

• A single-step laser-induced transfer (LIT) process was employed, sandwiching MXene films between substrates.
• The process created an oxygen-depleted microenvironment under laser irradiation for simultaneous film transfer.
• Solid-state sintering and the formation of a carbon-rich surface layer were key outcomes of the LIT process.

Main Results:

• LIT significantly improved MXene adhesion and chemical stability, demonstrated by low sheet resistance (<25 Ω/sq on glass, <6 Ω/sq on TPU) after aging.
• The LIT process protected MXenes from oxidation, unlike conventional laser patterning which accelerated decomposition.
• Enhanced adhesion and stability enabled the fabrication of robust interfaces for electrothermal heaters and breath sensors.

Conclusions:

• Laser-induced transfer is a powerful interfacial engineering technique for MXenes, resolving key challenges in adhesion and stability.
• The LIT method offers a robust solution for implementing MXenes in electronics, sensors, and wearable devices.
• This approach enhances material durability and performance, paving the way for advanced applications.