PVDF Nanofiber Yarn

β-phase ~93%

Hot-stretching microstructural control simultaneously boosts piezoelectric output and mechanical robustness, enabling high-performance PENGs.

Zhang, Xiaoyu · Liu, Yi · Wang, Mengqi · Yu, Jun · Liu, Yuqing · Lin, Jinyou

Nano Letters 2025

Specifications

Piezoelectric Output

{'zh': '1.4', 'en': '1.4'} V

Fracture Stress

{'zh': '65', 'en': '65'} MPa

β-phase Content

{'zh': '93', 'en': '93'} %

Crystallinity

{'zh': '60', 'en': '60'} %

Advantages

Boosted piezoelectric output

Hot stretching tunes the crystalline structure, raising piezoelectric output from 0.3 to 1.4 V, a 366.7% enhancement, for more sensitive energy harvesting.

Stronger mechanics

Fracture stress reaches 65 MPa, a 444% improvement over pristine, making the yarn more durable for flexible device integration.

High β-phase content

Approximately 93% β-phase content ensures piezoelectric activity, resulting from hot-stretching-induced regular crystalline structure.

Combined mechanical-electrical enhancement

Hot stretching simultaneously optimizes crystalline morphology, achieving dual enhancement of piezoelectric output and mechanical strength, avoiding the trade-off often seen in performance improvement.

Applications

• Piezoelectric Nanogenerators：Directly serve as the core transducer material in PENGs, replacing low-β-phase PVDF for higher output.
• Motion Monitoring Sensors：Act as flexible motion sensors converting mechanical deformation into electrical signals for real-time motion capture.
• Wearable Health Monitoring：Integrate into wearables to monitor human activity or physiological signals without external power.
• Micro/Nano Energy Harvesting：Efficiently harvest micro/nano-scale mechanical energy to power small electronics.