Characterization of β-PVDF-based nanogenerators along with Fe2O3 NPs for piezoelectric energy harvesting

• Published in: Journal of materials science. Materials in electronics 2020-11, Vol.31 (21), p.19146-19158
• Main Authors: Zeyrek Ongun, Merve, Paralı, Levent, Oğuzlar, Sibel, Pechousek, Jiri
• Format: Article
• Language: English
• Subjects: Beta phase; Characterization and Evaluation of Materials; Chemistry and Materials Science; Energy harvesting; Fourier transforms; Free form; Iron 57; Iron oxides; Materials Science; Mossbauer spectroscopy; Nanogenerators; Nanoparticles; Optical and Electronic Materials; Particulate composites; Piezoelectricity; Polyvinylidene fluorides; Spectrum analysis; X ray powder diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-04451-y

β -phase polyvinylidene fluoride (PVDF) nanogenerators along with various concentrations (0.2, 0.4, 0.6, and 0.8 wt%) of iron oxide (Fe 2 O 3 ) nanoparticles were produced using the electrospinning technique. The characterization of the free- and doped-nanogenerators was examined by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and 57 Fe Mössbauer spectroscopy, dielectric measurements, and piezoelectric effect analysis. All the analyses demonstrated that the structural transition in the specimens at doping ratios are above the critical concentration of 0.4% by wt. of Fe 2 O 3 NPs in PVDF, superparamagnetic behavior of the iron oxide particles in the composite. Utilization of the β -PVDF along with Fe 2 O 3 NPs (0.4 wt%) exhibited higher piezoelectric properties with respect to the free form and the other additive concentrations. Considering the piezoelectric properties of the nanogenerator, the output voltage of the β -PVDF in the presence of the 0.4 wt% of Fe 2 O 3 NPs reaches up to 1.39 V by increasing the peak amplitude to almost 50% while the undoped β -PVDF nanogenerator reveals almost to 0.93 V at the same impact frequency (6–7 Hz).