Tenon-and-Mortise Structure-Inspired MOF/PVDF Composites with Enhanced Piezocatalytic Performance via...

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Poly(vinylidene fluoride) (PVDF) and its composites are crucial for advanced intelligent devices.
• Challenges exist in maximizing spontaneous polarization and electromechanical conversion efficiency in PVDF composites.
• Developing novel piezoelectric materials is key for next-generation portable and implantable electronics.

Purpose of the Study:

• To construct an amino-anchored metal-organic framework (MOF)/PVDF piezoelectric composite.
• To enhance piezocatalytic performance through a dipole-engineering strategy.
• To improve ferroelectric properties and expand applications of piezoelectric composites.

Main Methods:

• Fabrication of a composite using amino-anchored NH2-HU MOF and PVDF.
• Utilizing a dipole-engineering strategy with hydrogen-bond networks.
• Characterization of β-phase content, remnant polarization, and piezocatalytic activity.

Main Results:

• The NH2-HU10wt%/PVDF composite showed a 40% increase in β-phase content and over 550% higher remnant polarization than bare PVDF.
• Achieved 97.4% piezocatalytic bactericidal performance under clinical ultrasound irradiation.
• Doubled CT imaging efficacy for implants at lower voltages due to enhanced polarizability.

Conclusions:

• The MOF/PVDF composite demonstrates superior piezoelectric and piezocatalytic properties.
• Molecular design integrating piezoelectric MOFs and polymer matrices is effective for optimizing ferroelectric properties.
• This approach offers a viable pathway for advanced applications in intelligent devices and medical imaging.