Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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A. Kryshtal


Ostatnie publikacje
1.  Szewczyk P.K., Gradys A., Kyun Kim S., Persano L., Marzec M., Kryshtal A., Busolo T., Toncelli A., Pisignano D., Bernasik A., Kar-Narayan S., Sajkiewicz P., Stachewicz U., Enhanced piezoelectricity of electrospun polyvinylidene fluoride fibers for energy harvesting, ACS Applied Materials and Interfaces, ISSN: 1944-8244, DOI: 10.1021/acsami.0c02578, Vol.12, No.11, pp.13575-13583, 2020

Streszczenie:
Piezoelectric polymers are promising energy materials for wearable and implantable applications for replacing bulky batteries in small and flexible electronics. Therefore, many research studies are focused on understanding the behavior 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 multitechnique approach combining microscopy and spectroscopy was used to study the content of the 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 the 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 the d33 piezoelectric coefficient for PVDF fibers by more than three times and allowed us to generate a power density of 0.6 μW·cm^–2 from PVDF membranes. This study showed that the 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 74%. The humidity and voltage polarity are critical factors in respect of chemistry of the material on piezoelectricity of PVDF fibers, which establishes a novel route to engineer materials for energy-harvesting and sensing applications.

Słowa kluczowe:
PVDF, polymer crystallinity, electrospinning, piezoelectricity, voltage polarity

Afiliacje autorów:
Szewczyk P.K. - inna afiliacja
Gradys A. - IPPT PAN
Kyun Kim S. - inna afiliacja
Persano L. - inna afiliacja
Marzec M. - inna afiliacja
Kryshtal A. - inna afiliacja
Busolo T. - inna afiliacja
Toncelli A. - inna afiliacja
Pisignano D. - inna afiliacja
Bernasik A. - inna afiliacja
Kar-Narayan S. - inna afiliacja
Sajkiewicz P. - IPPT PAN
Stachewicz U. - AGH University of Science and Technology (PL)
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