Enhanced Piezoelectricity of Electrospun Polyvinylidene Fluoride Fibers for Energy Harvesting.
ACS applied materials & interfaces
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Szewczyk, P. K., Gradys, A., Kim, S., Persano, L., Marzec, M., Kryshtal, A., Busolo, T., et al. (2020). Enhanced Piezoelectricity of Electrospun Polyvinylidene Fluoride Fibers for Energy Harvesting.. ACS applied materials & interfaces, 12 (11), 13575-13583. https://doi.org/10.1021/acsami.0c02578
Piezoelectric polymers are promising energy materials for wearable and implantable applications, for replacing bulk batteries in small and flexible electronics. Therefore, many research studies are focused on understanding the behaviour of polymers at a molecular level and designing new polymer-based generators using polyvinylidene fluoride (PVDF). In this work, we investigated the influence of voltage polarity and ambient relative humidity in electrospinning of PVDF for energy harvesting applications. A multi-technique approach combining microscopy and spectroscopy was conducted to study the content of β-phase and piezoelectric properties of PVDF fibers. We shed new light on β-phase crystallization in electrospun PVDF and showed the enhanced piezoelectric response of PVDF fiber-based generator produced with the negative voltage polarity at a relative humidity of 60%. Above all, we proved that not only crystallinity but also surface chemistry is crucial for improving piezoelectric performance in PVDF fibers. Controlling relative humidity and voltage polarity, increased d33 piezoelectric coefficient for PVDF fibers more than 3 times and allowed to generate power density of 0.6 µW·cm-2 from PVDF membranes. This study showed that electrospinning technique can be used as a single-step process for obtaining a vast spectrum of PVDF fibers exhibiting different physicochemical properties with β-phase crystallinity reaching up to 73%. The humidity and voltage polarity are critical factors in respect of chemistry of material on piezoelectricity of PVDF fibers, which establishes a novel route to engineer materials for energy harvesting and sensing applications.
European Commission (639526)
External DOI: https://doi.org/10.1021/acsami.0c02578
This record's URL: https://www.repository.cam.ac.uk/handle/1810/319176
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/