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 δ- or β-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 P-E hysteresis, it is concluded that a flexible and shrinkable ferroelectric δ-phase PVDFPDMS sponge is fabricated. Voltage and capacitance increased with an increase in the amount of total charge induced by ferroelectric polarization at each mechanical stress.
All Science Journal Classification (ASJC) codes
- Materials Science(all)