Impedance Analysis on the Percolation Mechanism of the Nickel/Calcium Copper Titanate/Polyvinylidene Fluoride Composite
| Periodical | Materials Science Forum (Volume 722) |
|---|---|
| Main Theme | Functional Nanocomposite Materials |
| Edited by | Shuhui Yu, Rong Sun and Ruxu Du |
| Pages | 61-70 |
| DOI | 10.4028/www.scientific.net/MSF.722.61 |
| Citation | Wen Hu Yang et al., 2012, Materials Science Forum, 722, 61 |
| Online since | June, 2012 |
| Authors | Wen Hu Yang, Shu Hui Yu, Rong Sun, Ru Xu Du |
| Keywords | Equivalent Circuit, Impedance Spectroscopy, Percolation |
| Price | US$ 28,- |
The composites composed of micro-sized calcium copper titanate (CCTO) and nano-sized metallic nickel (Ni) fillers in the polyvinylidene fluoride (PVDF) matrix (Ni/CCTO/PVDF) were prepared, in which the filler content (volume fraction) of Ni and CCTO was set at 60 %. The impedance spectra and a serial equivalent circuit model consisting three RC units were used to investigate the behaviors of the Ni/CCTO/PVDF three-phase composite system near the percolation threshold. The real (Z′) and imaginary (Z″) parts of the impedance dramatically decreased as the Ni content was increased from 22% to 24% indicating a transition from an insulating to a conducting state. This transition process has been realized by the changes in the capacitance derived from the model, and the investigation has been carried out to clarify the release mechanism of the entrapped electrons at the interfaces.
