Electrical conductivity and dielectric spectroscopic studies of PVA–Ag nanocomposite films

Metal-Polymer Nanocomposites: (Co-)Evaporation/(Co)Sputtering Approaches and Electrical Properties

“…Also, these data corroborate the enhanced conductivity of PVA matrix with increases in the Ag NPs' concentration. Figure 24 summarizes the authors' results [98]: it reports the dc electrical conductivity of the samples with increasing the Ag NPs concentration (0.13, 0.26, 0.41, 0.50, 0.80 and 1.32 wt %), showing that the conductivity of PVA increases by 1 order of magnitude when the Ag concentration reaches 1.32 wt %.…”

“…Mahendia et al [98] fabricated Poly(vinyl alcohol)-silver (PVA-Ag) nanocomposite films by the soft chemical route. The effect of the concentration of embedded Ag NPs on the film conductivity and on the films dielectric relaxation behavior was analyzed.…”

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

“…In addition, a lower electrical conduction was attributed to fewer direct contact between both fillers to provide continuous conductive pathways. This circumstance limits the charge transfer process between the fillers and PVA chains, which retains the insulating property of the polymer [27].…”

“…However, the ε′ values are decreased at 1.8 wt% with a further loading of AgNP. The occurrence of dielectric permittivity was initiated from MWNT π-orbital that provides a large field for moving electrons to be easily polarized [27]. In addition, the incorporation of AgNP could reduce the ohmic contact resistance between the nanotubes and increased the charge carriers (electrons or holes) concentration by injection or ejection of electrons in the valence or conduction bands [11].…”

“…The significant increment in the conductivity and dielectric permittivity of the nanocomposites are ascribed to high physical interactions between polymer chains and the conductive networks of MWNT-AgNP. As the AgNP content increases, there would be a charge transfer complexes (CTC) occurs within amorphous regions of the PVA by reducing the potential barrier of two localized states to allow the transfer of charge carriers [27,30,37]. However, as the content of AgNP increased further up to 1.8 wt%, inducing large pores and metal clouds exist between the MWNT networks and the matrix ( figure 7(d)).…”