AUTHOR=Hu Xiaoran , You Mengli , Yi Na , Zhang Xiaokun , Xiang Yong 

TITLE=Enhanced Piezoelectric Coefficient of PVDF-TrFE Films via In Situ Polarization

JOURNAL=Frontiers in Energy Research

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.621540

DOI=10.3389/fenrg.2021.621540

ISSN=2296-598X

ABSTRACT=<p>The d<sub>33</sub> coefficient = 28 pC/N of PVDF-TrFE piezoelectric films was achieved by the <italic>in situ</italic> polarization. Compared with traditional poling methods, the <italic>in situ</italic> polarization is performed with low poling voltage and short poling time, and it can ensure the PVDF-TrFE film with enhanced piezoelectric performances and uniform distribution among a large area of 200 mm<sup>2</sup> × 200 mm<sup>2</sup>. The processing influence of drying, annealing, and poling on the crystalline properties and piezoelectric performances were investigated. Besides, the obtained PVDF-TrFE films present a good piezoelectric response to different extents of mechanical stimulations, which have great potential in energy harvesting applications.</p>