Preparation and Properties of PLA/BTO@PDA Piezoelectric Composite Films
LI Yujia1, TIAN Xiuzhi1,2, LIU Peiting1, HOU Enfeng1, LI Mingqin1, JIANG Xue1,*
1 College of Bioresources Chemical and Materials Engineering (College of Flexible Electronics), Shaanxi University of Science and Technology, Xi’an 710016, China 2 Guangxi Key Laboratory of Clean Pulp and Paper Making and Pollution Control, Guangxi University, Nanning 530007, China
Abstract: The electrospun fiber membrane prepared by compositing high-piezoelectric-coefficient barium titanate (BTO) nanoparticles with polylactic acid (PLA) significantly enhances the piezoelectric properties of PLA membranes. However, BTO tends to aggregate in the PLA matrix, inducing phase separation that adversely affects both piezoelectric and mechanical properties of the PLA/BTO composite membrane. In this study, polydopamine (PDA)-modified BTO (BTO@PDA) was blended with PLA to fabricate PLA/BTO@PDA composite electrospun fiber membranes. The study demonstrated that BTO@PDA exhibited improved dispersion and interfacial compatibility within the PLA matrix, significantly enhancing both piezoelectric and mechanical properties of the PLA/BTO@PDA composite membrane. When doped with 3% (mass fraction) BTO@PDA, the composite membrane achieved optimal performance:its piezoelectric current and voltage outputs were 37% and 55% higher than those of PLA/BTO composites, and 7.59 and 6.63 times greater than pure PLA membranes, respectively. The output power reached the maximum value at an external load resistance of 30 MΩ. Additionally, its tensile fracture strength and elongation at break were 42% and 18% higher than those of PLA/BTO composites. The PLA/BTO@PDA composite membrane device exhibited zero attenuation in pulsed alternating current during 4 000 s of cyclic impact-release loading, demonstrating robust stability for long-term operation. As a wearable sensor, the PLA/BTO@PDA membrane can conformably adhere to multiple human body regions, enabling sensitive detection of finger pressing/bending, walking/running motions, and even powering red LED illumination. These multifunctional capabilities highlight its significant potential in next-generation motion-sensing wea-rables.
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2026, Vol. 40 
