Abstract
Ferroelectric polymers are widely used in wearable energy conversion electronics for their favorable flexibility and pyroelectric properties, such as infrared sensors and energy harvesting devices. In this work, we report a method to greatly enhance the pyroelectric properties of polyvinylidene fluoride (PVDF) by spin-coating. Under the shear stress induced by spin-coating, the crystallization behavior of PVDF has been distinctly improved. As a result, the crystallinity and relative content of β phase achieve 40% and 97% in PVDF and the polarization reaches up to 28.2 µC/cm2 at 80 MV/m2. Consequently, the pyroelectric coefficient of spin-coated PVDF film has been raised to as high as 0.92 × 10−8 C/cm2 K at 35 °C, which is significantly superior to those of cast PVDF film, stretched PVDF film, P(VDF-TrFE) film and the PVDF-PZT composite film. This achievement will enable the practically potential for PVDF based pyroelectric polymers in wearable infrared sensors and energy harvesting devices.
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Acknowledgements
We acknowledge National Natural Science Foundation of China (Grant Nos. 51772108, 61675076, and 61705070), China Postdoctoral Science Foundation (Grant Nos. 2017M612449 and 2017T200545), Shenzhen Science and Technology Project (JCYJ201703071551154,JCYJ20170818170222368 and JCYJ20180507182248925), the National Key Research and Development Plan (2016YFB04027), the Natural Science Foundation of Hubei Province of China (Grant No. 2018CFB427), the Fundamental Research Funds for the Central Universities (2018KFYYXJJ052). We would also like to acknowledge the Analytical and Testing Center of Huazhong University of Science and Technology.
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Zhang, G., Weng, L., Bao, R. et al. Significantly enhanced ferroelectric and pyroelectric properties in polyvinylidene fluoride induced by shear force with spin-coating. J Mater Sci: Mater Electron 30, 12540–12544 (2019). https://doi.org/10.1007/s10854-019-01614-4
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DOI: https://doi.org/10.1007/s10854-019-01614-4