Dual Stimuli-Responsive Actuation of Oriented MXene/Polymer Composite

Area of Science:

• Materials Science
• Soft Robotics
• Nanotechnology

Background:

• Soft actuators are crucial for applications needing precise motion control and environmental sensing.
• Bilayer structures are common but prone to delamination; continuous monolayer systems offer an alternative.
• Titanium carbide (Ti₃C₂T_x) MXene offers unique properties for advanced material applications.

Purpose of the Study:

• To present a scalable method for fabricating monolithic gradient Ti₃C₂T_x MXene/polymer composite films.
• To achieve directional bending actuation in soft actuators.
• To explore the dual-mode actuation mechanism and performance of these novel actuators.

Main Methods:

• Fabrication of monolithic gradient Ti₃C₂T_x MXene/polymer composite films.
• Application of an in-plane alternating current (AC) electric field during photopolymerization to induce nanosheet alignment and sedimentation.
• Structural analysis and condition-dependent tests to elucidate the actuation mechanism.

Main Results:

• Aligned films exhibited enhanced bending performance and controlled bending direction compared to random films.
• The dual-mode actuation mechanism was successfully elucidated through analysis and testing.
• The actuators demonstrated excellent reversibility and durability under infrared light and humidity stimuli.

Conclusions:

• The developed method provides a robust platform for creating MXene-based soft actuators with defined anisotropy.
• These actuators are suitable for adaptive robotics, wearable humidity sensors, and thermally responsive systems.
• The study highlights the potential of gradient MXene/polymer composites for advanced soft actuator applications.