3D printed ferroelectret with giant piezoelectric coefficient

Abstract

A ferroelectret cellular structure of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] is fabricated by a 3D printing technique that exhibits a giant piezoelectric coefficient of 1200 pC/N, which is 40 times higher than its commonly known film counterpart. It attributes that the bi-polar charge separation in cellular voids upon the corona discharge behaves as macroscopic dipoles. An increase in the surface potential and dielectric constant (from 10 to 20 at 1 kHz) also attributes to charged voids. Furthermore, the deviation of ferroelectric behavior, for instance, the continuous increasing trend in dielectric constant and remanent polarization as a function of temperature attributes to ferroelectret behavior of a 3D printed P(VDF-TrFE) specimen. The mechanical energy harvester (MEH) made with this ferroelectret structure shows prompt response with [Formula: see text]4 W/m2 of the power density. Furthermore, the benefit of the giant piezoelectric coefficient of the MEH is used to demonstrate self-powered tactile mapping.

Machine Learning-Aided All-Organic Air-Permeable Piezoelectric Nanogenerator

“…After the PEDOT coating of PVDF nanofibers, the device was processed under a roller to reduce the possible air gaps and to minimize the chances of triboelectricity. Finally, we achieved the δ-PVDF nanoparticle-based flexible PNG to harvest the energy from mechanical vibrations and motions. − , The working mechanism of the fabricated PNG is demonstrated in details (Supporting Information, Figure S8 and Discussion S1).…”

“…Once the sensor data are obtained, it could be further preprocessed and separated in the training and test data. Furthermore, this training data can be run over different ML algorithms to obtain the maximum precision with respect to the test data. − Once the model is successfully trained, then we can expose this model with new data sets and see the predicted results as shown in above schematics (Figure a).…”

“…Finally, we achieved the δ-PVDF nanoparticle-based flexible PNG to harvest the energy from mechanical vibrations and motions. [44][45][46][47][48][49]52 The working mechanism of the fabricated PNG is demonstrated in details (Supporting Information, Figure S8 and Discussion S1).…”

Multifunctional poly(vinylidene fluoride–co‐hexafluoropropylene) ‐ zinc stannate nanocomposite for high energy density capacitors and piezo‐phototronic switching

“…There are different types of polarization phenomena such as electronic, atomic, orientation and space change polarization occur in dielectric corresponding to different frequency regions. 7 The polarization and depolarisation phenomena in electronic and atomic polarization are very quick. It takes a very short time (< 10 À12 s) to polarize or depolarise electronic and atomic polarization in comparison to orientation polarization.…”

“…The maximum value of remnant polarization mainly depends on the type of polarization in the dielectric. There are different types of polarization phenomena such as electronic, atomic, orientation and space change polarization occur in dielectric corresponding to different frequency regions 7 . The polarization and depolarisation phenomena in electronic and atomic polarization are very quick.…”