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Open AccessCommunication

Mechanical Fatigue Resistance of Piezoelectric PVDF Polymers

1
KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea
2
Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Korea
3
Materials Architecturing Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
4
Photo-Electronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
*
Authors to whom correspondence should be addressed.
Micromachines 2018, 9(10), 503; https://doi.org/10.3390/mi9100503
Received: 18 September 2018 / Revised: 28 September 2018 / Accepted: 3 October 2018 / Published: 4 October 2018
(This article belongs to the Special Issue Nanogenerators in Korea)
The fatigue resistance of piezoelectric PVDF has been under question in recent years. While some report that a significant degradation occurs after 106 cycles of repeated voltage input, others report that the reported degradation originates from the degraded metal electrodes instead of the piezoelectric PVDF itself. Here, we report the piezoelectric response and remnant polarization of PVDF during 107 cycles of repeated compression and tension, with silver paste-based electrodes to eliminate any electrode effect. After applying repeated tension and compression of 1.8% for 107 times, we do not observe any notable decrease in the output voltage generated by PVDF layers. The results from tension experiments show stable remnant polarization of 5.5 μC/cm2, however, the remnant polarization measured after repeated compression exhibits a 7% decrease as opposed to the tensed PVDF. These results suggest a possible anisotropic response to stress direction. The phase analyses by Raman spectroscopy reveals no significant change in the phase content, demonstrating the fatigue resistance of PVDF. View Full-Text
Keywords: ferroelectric; PVDF; piezoelectric; mechanical fatigue resistance; remnant polarization ferroelectric; PVDF; piezoelectric; mechanical fatigue resistance; remnant polarization
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MDPI and ACS Style

Shin, Y.-H.; Jung, I.; Park, H.; Pyeon, J.J.; Son, J.G.; Koo, C.M.; Kim, S.; Kang, C.-Y. Mechanical Fatigue Resistance of Piezoelectric PVDF Polymers. Micromachines 2018, 9, 503.

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