Polyvinylidene fluoride (PVDF) polymer is considered as an encouraging piezoelectric material whose optical properties need to be enhanced. Zinc ferrite is an excellent photoelectric material, in the present work it was doped separately by (cobalt and copper) ferrite. Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles were synthesized using auto-combustion method and characterized using XRD, FTIR, FESEM and HRTEM. The crystallite size was (28.8, 35.8, 22 and 31) nm for the Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles, while the estimated particle size from HRTEM were 55 nm for the Co-ZnFe2O4 nanoparticles and 75 nm for the Cu-ZnFe2O4. The obtained samples used as PVDF fillers, aiming to improve its optical properties. The optical properties as well as, the piezoelectric response of the prepared PVDF/(Co-ZnFe2O4 and Cu-ZnFe2O4) nanocomposites were investigated. The maximum value for refractive index was related to PVDF/Co-ZnFe2O4 nanocomposite. While, Cu-ZnFe2O4 nanoparticles have limited improvement of the PVDF optical properties. Co-ZnFe2O4 nanoparticles increases the PVDF optical conductivity σopt. four times its original value as well as the dielectric values was increased from 0.05 for neat PVDF to 2. The piezoelectric response of the PVDF polymer is clearly increased by the addition of both Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles.
Cobalt ferrite, Copper ferrite and cobalt doped copper ferrite nanoparticles have been synthesized and characterized using different characterization methods (XRD, FTIR and FESEM). The prepared nanoparticles have been used as promising fillers of the polyvinylidene fluoride (PVDF) polymer. The PVDF/(Cu-CoFe 2 O 4 , CoFe 2 O 4 , and CuFe 2 O 4 ) nanocomposites films have been prepared via a simple solution casting technique. The optical properties and the piezoelectric response of the prepared nanocomposite films have been studied. The study showed that Cu-CoFe 2 O 4 , CoFe 2 O 4 , and CuFe 2 O 4 have enhanced the interfacial polarization density and dielectric constant. The optical conductivity value of PVDF/ (Cu-CoFe 2 O 4 and CoFe 2 O 4 ) increased five times compared with the pure PVDF. Also, an increase in the piezoelectric response has been recorded by adding the nano-fillers to the pure PVDF.
Metal ferrites have outstanding electrochemical characteristics owing to the numerous oxidation states of the metal ions, making them promising materials for addressing both sustainable energy conversion and storage and growing environmental issues. Therefore, three nanocrystallites transition metal ferrites, CoFe2O4, CuFe2O4 and Co/CuFe2O4, were synthesized using citrate precursors and used as electrode materials for supercapacitor applications. Mixed transition metal ferrite nanoparticles were characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM) complemented with energy-dispersive spectroscopy (EDX), transmission electron microscopy (TEM), Raman spectroscopy and thermal analysis (TGA). The findings illustrated the formation of a single-phase spinel ferrite as proved from XRD data. In addition, the particle shape and particle size obtained from TEM analysis revealed that the as-synthesised nanomaterial exhibited spherical shape with a size ranging from 30 to 50 nm. The result demonstrated that while using a three-electrode configuration, the electrochemical performance of the ferrite nanoparticles achieved a remarkable maximum specific capacitance of 893 Fg−1 at a scan rate of 5 mV s−1. At a current density of 1 Ag−1, Co–Cu ferrite exhibited outstanding cycling stability for 3000 cycles with 90% capacity retention. Based on the aforementioned data, it can be considered that the remarkable electrochemical performance of the Co–Cu ferrite nanocomposites can be considered as promising materials to be used for supercapacitor electrodes.
In this work, the effects of CoxZn1-x Fe2O4 (x= 0, 0.5, 1) nanofillers on the PVDF polymer were scientifically studied. The structure and magnetic and optical properties were studied. XRD confirms the synthesis of nanofiller in a single phase. FTIR confirms the formation of nanoferrites. HRTEM shows that the prepared nanoferrites have a cubic-like shape. Also, the size and agglomeration increase with Co-Zn Fe2O4 nanoferrites compared to the other singles one. The effect of adding nanoferrites into PVDF matrix was studied using XRD, FTIR, FESEM, VSM, and UV-Vis. XRD and FTIR approved the complexation between PVDF polymer and nanoferrites. Also, addition of nanoferrites into PVDF leads to decrease the semi-crystalline nature of PVDF. FESEM showed that embedding nanoferrites into PVDF polymers creates pores and PVDF/Co-Zn Fe2O4 increases the pore size on the PVDF surface. The magnetic properties of PVDF were enhanced by adding the nanofiller. For example, saturation magnetization was increased from 269.31E−6 to 62.052E−3 by adding CoFe2O4 to PVDF polymer. Band gap calculation showed that PVDF/Co-Zn Fe2O4 has the lowest band gap energy which makes it useful in photochemical and electronic applications.
Polyvinylidene fluoride (PVDF) polymer is considered as an encouraging piezoelectric material whose optical properties need to be enhanced. Zinc ferrite is an excellent photoelectric material, in the present work it was doped separately by (cobalt and copper) ferrite. Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles were synthesized and characterized to be used as PVDF fillers, aiming to improve its optical properties. The optical properties as well as, the piezoelectric response of the prepared PVDF/ (Co-ZnFe2O4 and Cu-ZnFe2O4) nanocomposites were investigated. A significant improvement in the PVDF relative permittivity, optical conductivity, refractive index, non-linear susceptibility, and a great reduction in the band gap energy value is obtained by adding Co-ZnFe2O4 nanoparticles to it. However, Cu-ZnFe2O4 nanoparticles have limited improvement of the PVDF optical properties compared to the Co-ZnFe2O4 nanoparticles. as Co-ZnFe2O4 nanoparticles increases the PVDF optical conductivity σopt. four times its original value as well as the dielectric values was increased from 0.05 for neat PVDF to 2. The piezoelectric response of the PVDF polymer is clearly increased by the addition of both Co-ZnFe2O4 and Cu-ZnFe2O4 nanoparticles.
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