Enhanced piezo‐electric property induced in graphene oxide/polyvinylidene fluoride composite flexible thin films

Abstract

Graphene oxide/PVDF composite free‐standing flexible films were prepared with different amount of GO fillers in PVDF matrix using sol‐gel technique. The films were characterized by Field emission scanning electron microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy (FTIR), X‐ray photoelectron spectroscopy (XPS) and Raman studies. Results FTIR, XPS, and Raman were critically analysed for modulation of bonding ambience. The GO/PVDF composite films indicated films to be sp2 rich. Departure from centro‐symmetry of GO when embedded in PVDF matrix leading towards efficient nanogenerator application is discussed critically in the light of Raman and XPS studies. High output voltage was recorded for the unpoled film while the poled samples indicated very negligible output. A rectifying circuit was used to charge a capacitor which was discharged for supplying energy to trigger a red light emitting diode. A maximum a.c. output voltage of ±28V was recorded at microwatt power level. Increments in output voltages with increased GO loading in the PVDF matrix were observed. POLYM. COMPOS., 39:4205–4216, 2018. © 2017 Society of Plastics Engineers

PVDF/Graphene Composite Nanoporous Membranes for Vanadium Flow Batteries

“…The chemical composition of pristine PVDF membranes, PVDF/graphene-0.15 composite membranes, and high-activity graphene were investigated by ATR and FT-IR. The absorption bands at 1167 and 1230 cm −1 were assigned to F–C–F, which indicated the presence of a PVDF matrix [28]. There were no absorption bands at 1280 cm −1 (asymmetric stretching of O=S=O), 1010 cm −1 (S=O stretching) and 707 cm −1 (S–O stretching).…”

Milli-Watt Power Harvesting from Dual Triboelectric and Piezoelectric Effects of Multifunctional Green and Robust Reduced Graphene Oxide/P(VDF-TrFE) Composite Flexible Films

“…Figure 9d depicts the comparative studies of our achieved output voltages and power densities from PENG and HPTENG devices with respect to other reported values with the composite of graphene derivatives and PVDF or its copolymer. 29,39,40,72,73…”

“…In addition to the use of ceramic fillers, inclusion of carbon-based materials (carbon nanotubes, graphene, and carbon black) has also been demonstrated to improve the dielectric and piezoelectric behavior of PVDF and its co-polymers. − An important attribute of these composites is that they are also environment-friendly and biodegradable in contrast to lead-based polymer composites. While such carbon forms are nonpiezoelectric, recent first-principles studies have demonstrated that piezoelectricity can be engineered in nonintrinsically piezoelectric 2D graphene by physical absorption of selective atoms: Li, H, F, and K on the basal plane of graphene, breaking the inversion symmetry and inducing piezoelectricity in graphene.…”

Unveiling the Role of Graphene Oxide as an Interface Interlocking Ingredient in Polyvinylidene Fluoride‐Based Multilayered Thin‐Film Capacitors for High Energy Density and Ultrafast Discharge Applications

“…[ 28 ] Thus, the presence of oxygen‐containing groups such as hydroxyl, epoxy, carbonyl, and carboxyl functional groups confirms the formation of GO through oxidation of graphite. [ 29 ] Therefore, XRD, Raman, and FTIR together confirm the successful synthesis of GO.…”