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Energy Harvesting δ-Phase Polyvinylidene-Fluoride Sponge

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Flexible and shrinkable ferroelectric δ-phase PVDF sponge and its unique voltage and capacitance behavior in response to periodic mechanical stress are reported. Depending on the electrical poling field, chain formation of PVDF-PDMS was determined to be β- or δ-phase. For the β-phase PVDF-PDMS material, voltage output was generated only when strain was applied and released. On the contrary, the δ-phase PVDF-PDMS material exhibited pulse-type stable and uniform voltage during periodic pushing. As the PVDF concentration and the pushing depth increased, output voltage increased. In addition, for the δ-phase PVDF-PDMS, a pulse-type capacitance increase was observed repeatedly in response to periodic mechanical stress. Because δ-phase PVDF-PDMS exhibited PE hysteresis, it is concluded that a flexible and shrinkable ferroelectric δ-phase PVDF-PDMS sponge is fabricated. Voltage and capacitance increased with an increase in the amount of total charge induced by ferroelectric polarization at each mechanical stress.
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Keywords: FERROELECTRIC; PIEZOELECTRIC; PVDF SPONGE; β-PHASE PVDF; δ-PHASE PVDF

Document Type: Research Article

Publication date: April 1, 2016

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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