Electrical and dielectric behaviors and their origins in the three-dimensional polyvinyl alcohol/MWCNT composites with low percolation threshold

Activation behavior and dielectric relaxation in polyvinyl alcohol and multiwall carbon nanotube composite films

“…Only a few works give the information regarding the electrical and dielectric properties of PVA/CNT composites. Zhang et al [21] describes the electrical and dielectric properties of PVA/MWNT composites above room temperature. But a systematic study of electric and dielectric properties of PVA/MWNT composites below room temperature is still unavailable.…”

“…On the other hand, no peaks would not be observed in "-f plots in the measured frequency region. In general, the conduction due to the conductive part of the disordered systems masks the interfacial polarization [21,26]. In such cases, the dielectric properties of the samples can be described by the complex electric modulus formalism [28].…”

Fractal Approach to Alternating Current Impedance Spectroscopy Studies of Carbon Nanotubes/Epoxy Polymer Composites

“…The power-law dependence of the CPE impedance suggests a possible relationship between CPE behavior and the fractal interface geometry of the electrode (Hernandez Creus et al, 1993;Le Mehaute & Crepy, 1983;Nyikos & Pajkossy, 1985;Sapoval et al, 1933). Numerous experimental studies on various materials using different characterization techniques were performed to reveal the structure of solid aggregates by means of fractal dimension (Risović et al, 2008;Zhang et al, 2009). In some, though not all, systems studied so far, a relation (Nyikos & Pajkossy, 1985):…”

The tunable permittivity of multi-walled carbon nanotubes/silver nanoparticles reinforced polyvinyl alcohol (PVA) nanocomposites at low frequency

“…It shows the pronounced effect of adding AgNP at low MWNT content to increase electrical conductivity of pure PVA. The percolation theory describes well-known power laws for electrical conductivity, σ and permittivity, ε of nanocomposites with fillers content as shown in the following relations [20,21]:…”

“…Therefore, there is a need for high permittivity polymer nanocomposites composed of two or more constituents that offer low temperature processing and materials flexibility with good adhesive properties. Several studies on the dielectric properties of CNT/polymer nanocomposites has revealed a parallel trend of the dielectric permittivity and loss due to their high surface area to volume ratio [20,21] Zhen et al reported on low frequency dependence of dielectric permittivity for polymer nanocomposites with CNT less than 5 wt% [22].…”