Synchronous Sound Recognition and Energy Harvesting by Flexible Piezoelectric PLLA/VB2 Composites

Qian Zhang; Qiang Liu; Weidong Xue; Yong Xiang; Xiaoran Hu

doi:10.3390/polym16081071

Synchronous Sound Recognition and Energy Harvesting by Flexible Piezoelectric PLLA/VB₂ Composites

Polymers (Basel). 2024 Apr 11;16(8):1071. doi: 10.3390/polym16081071.

Authors

Qian Zhang¹, Qiang Liu¹, Weidong Xue¹, Yong Xiang^{1

2}, Xiaoran Hu¹

Affiliations

¹ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China.
² Tianfu Jiangxi Laboratory, Chengdu 611731, China.

Abstract

In the present study, poling-free PLLA/VB₂ piezoelectric composites are fabricated to achieve synchronous sound recognition and energy harvesting. The addition of VB₂ can interact with PLLA by intermolecular hydrogen bonding, inducing the dipole orientation of C=O in PLLA. Meanwhile, VB₂ can promote crystallization of PLLA through heterogeneous nucleation. The combination of the two strategies significantly improves the piezoelectric performance of PLLA/VB₂ composites. The PLLA/VB₂ can detect the sound frequency with an accuracy of 0.1% in the range of 0-20 kHz to recognize characteristic sounds from a specific source. PLLA/VB₂ can also convert sound into electrical energy synchronously with an energy density of 0.2 W/cm^-3 to power up LEDs. Therefore, PLLA/VB₂ shows great potential in the field of information and energy synchronous collection.

Keywords: Vitamin B2; energy harvesting; piezoelectricity; polylactide; sound recognition.

Abstract

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