Flexible lead-free NBT-BT/PVDF composite films by hot pressing for low-energy harvesting and storage
| Autor: | Floriana Craciun, Paola Stagnaro, Francesco Cordero, A.S. Dzunuzovic, Giovanna Canu, Zeljko V. Despotovic, J.D. Bobić, Carmen Galassi, Elisabetta Brunengo, M.M. Vijatović Petrović, Elisa Mercadelli, Nikola Ilic |
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| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Materials science Polymers Piezoelectricity 02 engineering and technology Dielectric 010402 general chemistry Hot pressing 01 natural sciences 7. Clean energy Energy storage chemistry.chemical_compound Materials Chemistry Ceramic Composite material Elastic modulus Energy harvesting Mechanical Engineering Metals and Alloys Energy storage materials Composite materials 021001 nanoscience & nanotechnology Polyvinylidene fluoride 0104 chemical sciences chemistry Mechanics of Materials visual_art visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Journal of alloys and compounds 884 (2021): 161071-1–161071-12. doi:10.1016/j.jallcom.2021.161071 info:cnr-pdr/source/autori:Vijatovic Petrovic M.; Cordero F.; Mercadelli E.; Brunengo E.; Ilic N.; Galassi C.; Despotovic Z.; Bobic J.; Dzunuzovic A.; Stagnaro P.; G. Canu G.; Craciun F./titolo:Flexible lead-free NBT-BT%2FPVDF composite films by hot pressing for low-energy harvesting and storage/doi:10.1016%2Fj.jallcom.2021.161071/rivista:Journal of alloys and compounds/anno:2021/pagina_da:161071-1/pagina_a:161071-12/intervallo_pagine:161071-1–161071-12/volume:884 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.161071 |
| Popis: | The idea of this work is finding the way to efficiently and safely use mechanical energy released in small quantities around us to power up small-scale electronic devices used in everyday life. To this purpose, flexible lead-free piezoelectric composite films were prepared by hot pressing. Different amounts (30, 35 and 40 vol%) of lead-free piezoelectric material bismuth sodium titanate-barium titanate were embedded in the matrix of polyvinylidene fluoride under carefully optimized conditions of temperature and pressure, obtaining flexible films with quite homogeneous distribution of piezo-active filler. ATR-FTIR analysis revealed that hot pressing the flexible films caused a transformation of electro-inactive PVDF α-phase into electro-active β and γ phases. Dielectric measurements showed an increase of the permittivity up to 80 with the active phase increasing. Anelastic measurements showed that the elastic modulus increases as well with the fraction of active ceramic phase. Lastly, obtained flexible polymer-composites demonstrated notable properties both for energy storage and energy harvesting application, showing up to 74% of energy storage efficiency and, from testing of the force impact, up to 9 V and ~ 80 μW of output voltage and power. |
| Databáze: | OpenAIRE |
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