A High-Sensitivity MXene/PVDF Flexible Piezoelectric Sensor for Intelligent Tunnel Lighting

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Polyvinylidene fluoride (PVDF) has limited energy conversion efficiency due to low intrinsic β-phase content.
• Two-dimensional MXene nanosheets can induce β-phase crystallization in PVDF but face challenges in fabrication control and percolation leakage.
• Developing high-performance flexible piezoelectric composites is crucial for advanced sensing applications.

Purpose of the Study:

• To develop a synergistic strategy combining electrohydrodynamic (EHD) printing and an optimized serpentine structure for flexible piezoelectric composites.
• To enhance the piezoelectric sensitivity and mechanical durability of PVDF-MXene composites.
• To demonstrate the application of these composites in intelligent infrastructure, specifically a vehicle-responsive lighting system.

Main Methods:

• Utilized electrohydrodynamic (EHD) printing for precise fabrication of PVDF-MXene composites.
• Incorporated an optimized serpentine structure to improve mechanical properties.
• Precisely controlled MXene loading to 0.75 wt% to optimize β-phase content and avoid percolation leakage.

Main Results:

• Achieved a high β-phase content of 71.91% in the PVDF-MXene composite.
• Obtained a significant piezoelectric sensitivity of 18.09 mV/kPa.
• The serpentine structure resulted in a tensile strength of 21.97 MPa and 17.46% elongation at break.
• Demonstrated a 95.04% energy-saving rate in a vehicle-responsive tunnel lighting system.

Conclusions:

• The synergistic EHD printing and serpentine structure strategy effectively reconciles piezoelectric sensitivity with mechanical durability in PVDF-MXene composites.
• The developed flexible piezoelectric sensors show great promise for intelligent infrastructure applications, particularly in energy-efficient systems.
• This work offers a pathway for advancing high-performance flexible piezoelectric materials.