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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
S. Supriya, S. Kumar and M. Kar 
Corresponding Authors:
Manoranjan Kar 
DOI #:
https://doi.org/10.1007/s11664-019-07113-w 
Title:
Structural and Electrical Properties of CFO Nanoparticle- Filled PVA 
Journal:
Journal of electronic materials 
Year:
2019 
Volume:
48 
Page:
Keywords:
Composite material, polyvinyl alcohol, cobalt ferrite, dielectrics 
Abstract:
(1 x)PVA–(x)CFO nanocomposite thick films with x = 0 to 0.1 (i.e., 0% to 10%) have been prepared by employing the solvent casting method. The polyvinyl alcohol (PVA), cobalt ferrite (CFO), and PVA–CFO nanocomposites were characterized by x-ray diffraction pattern analysis, Raman spectroscopy, and Fourier-transform infrared (FTIR) spectroscopy. X-ray diffraction pattern analysis revealed the coexistence of both PVA and CFO in the nanocomposites, indicating that no major chemical reaction occurred between them. The morphology and elemental composition were analyzed by field-emission scanning electron microscopy (FE-SEM) and energy-dispersive spectroscopy (EDS), respectively. The real and imaginary parts of the dielectric constant were measured over a wide range of frequencies (100 Hz to 1 MHz) and temperatures (30C to 130C). The dielectric constant of PVA increased on loading CFO nanofiller into the polymer matrix. The resistivity was measured for all samples from room temperature to 130C. The electric polarization was measured using a ferroelectric hysteresis (P–E) loop tracer. The highest polarization was observed for the 2% CFO nanofiller loading in the PVA polymer matrix. The activation energy was calculated by analyzing the dielectric data, being lower than that obtained from the analysis of the temperature-dependent resistivity data. Also, the leakage current increased with increase of the CFO filler loading in the nanocomposite. 
Entered by:
Venkata Dantham on 2020-08-02 
 
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