The effect of CoFe2O4, CuFe2O4 and Cu/CoFe2O4 nanoparticles on the optical properties and piezoelectric response of the PVDF polymer

Abstract

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.

Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

“…The absorption bands at higher wavenumbers side are generally due to the presence of water which further gets confirmed by the bending and stretching of the H-O-H bond and O-H bond respectively. It has been observed that on adding yttrium in CFO, the peak has got shifted towards higher frequency band from 400 cm −1 (pure CFO) to 413 cm −1 [27]. On doping of 2% Cu 2+ in the YCFO, the peak shifting has been taken place towards the right side and the frequency band has risen to 416.64 cm −1 as compared to the prior one.…”

Study the multiferroic properties of BiFeO3/Ni0.1Fe2.9O4 for heavy metal removal

“…On other hand, at basic medium [pH = 8], oH − ions exist in solution. Consequently, Cr (oH) 6 is formed [30]. So, removal of Cr(VI) ions was associated with adsorption as well as precipitation.…”

Energy harvesting by piezoelectric polyvinylidene fluoride/zinc oxide/carbon nanotubes composite under cyclic uniaxial tensile deformation

“…25 The amount of β-phase of PVDF can also be increased by adding nanoparticle (NP) fillers, such as ZnO, barium titanate (BaTiO 3 ), titanium oxide (TiO 2 ), metal NPs, carbon coated NPs, ionic liquid and graphene/carbon nanotubes (CNT). [26][27][28][29][30] Addition of NPs reinforces the charge carrier, enhances charge distribution density in the polymer matrix, increases amount of electroactive β-phase content and hence enhances the piezoelectric property of the polymer. 31,32 Alam et al 29 fabricated PVDF/TiO 2 by electrospinning process to prepare a nanogenerator under compression mode of deformation and reported energy efficiency of 61% and charged 1 μF capacitor which charged up to 20 V within 50 s. Zhang et al 33 prepared nanofiber composites by using electrospinning process by mixing bismuth chloride (BiCl 3 ) and ZnO in PVDF and reported maximum voltage generation of 0.6 V in case of knee joint by bending (uniaxial) at different angles to monitor the effect of human body movement for energy harvesting applications.…”

“…Some of these post fabrications methods are, poling in presence of high electric field, 23 annealing, 24 mechanical stretching 25 or combination of any of these 25 . The amount of β ‐phase of PVDF can also be increased by adding nanoparticle (NP) fillers, such as ZnO, barium titanate (BaTiO 3 ), titanium oxide (TiO 2 ), metal NPs, carbon coated NPs, ionic liquid and graphene/carbon nanotubes (CNT) 26–30 . Addition of NPs reinforces the charge carrier, enhances charge distribution density in the polymer matrix, increases amount of electroactive β ‐phase content and hence enhances the piezoelectric property of the polymer 31,32 …”