Increase In Dc Conductivity Research Articles

Structural, Dielectric Permittivity and Optical Characteristics of Casting Poly Vinyl Alcohol/Calcium Nickel Aluminate Nanocomposite Films

ABSTRACTTriplex hybrid nanofiller (CaNiAl2O5) have been synthesized by sol-gel method and its nanocomposite (NC) films were incorporated with poly vinyl alcohol (PVA). The scanning electron microscopy (SEM) was used to probe morphological behaviors and dispersion of CaNiAl2O5 in PVA matrix. In order to probe the microstructure X-ray diffraction (XRD) and FTIR were performed on PVA/CaNiAl2O5 NCs. Based on the results of both XRD and transmission electron microscopy (TEM), the average particle size of the CaNiAl2O5 lies in the range 7–15 nm. The current (I) – voltage (V) behaviors were studied using LCR-meter at room temperature. The dc-conductivity increases with increasing in both CaNiAl2O5 at different voltages. The dielectric constant exhibits higher values at lower frequency and increases with nanoparticle (NP) loading due to increase in polarization particles in polymer matrix. The ac conductivity tends to increase with increase frequency and NPs content. The cyclic voltammetric data indicate the NC with 8wt% NPs exhibit higher specific capacitance as compared with PVA. The optical constants of the NCs were evaluated from UV-Visible spectra. The band gap energies has a blue shift from 4.4 eV (PVA) to 2.8 eV (PVA/8wt% CaNiAl2O5), whereas refractive index (RI) and the optical conductivity of NCs increased with an increasing in NPs content.

Synthesis of hydroxyapatite nanorods and its use as a nanoreinforcement block for ethylene methacrylate copolymer matrix

The use of anisotropic ceramic nanofillers as a reinforcing agent has been nurtured from the birth of polymer nanocomposites due to their superior physico-mechanical attributes, flexibility and optical transparency. Herein, synthesized hydroxyapatite was used to fabricate clay–polymer nanocomposites by a simple wet process. The surface-active polar functionalities of hydroxyapatite are highly prone to physisorbed with ethylene methacrylate copolymeric chains which boosts the strengthening of the nanocomposites. The cryo-fractured electron microscopic analysis showed dispersed nonphase separation morphology which was clearly reflected by improvement in uniaxial mechanical property. Moreover, the electrical conductivity was experimented which implied the AC responsive character due to the abundance of polar functionalities present in the respective composites. The increase in DC conductivity with filled polymer signified the interconnected pathway formation by nanofillers inside the polymer matrix. The superior dispersion was seen from the optical transparency where the nanofiller-confined composites have no drastic change in transparency.

Synthesis, Structural, Optical and Dielectric Studies on Carbon Dot-Zinc Oxide Nanocomplexes

In the present manuscript, we have reported the synthesis, structural, optical, AC conductivity and dielectric studies of carbon dot-zinc oxide (CDZO) nanocomplexes. CDZO nanocomplexes were synthesized by the wet chemical method. The refinement of X-ray powder diffraction data reveals that the sample possesses hexagonal structure of ZnO. The low intensity diffraction peaks corresponding to carbon come to existence, it is suggested that phase segregation has occurred in the CDZO nanoparticles. The strong absorption band observed in the UV region for the prepared samples can be attributed to the band edge absorption. Dielectric property and AC conductivity have been studied as a function of frequency (100[Formula: see text]Hz and 1[Formula: see text]kHz) of the applied AC signal in the temperature range 30[Formula: see text]C to 150[Formula: see text]C. The result showed that AC conductivity increases with increase of temperature. Dielectric loss and DC conductivity increase with increase of temperature.

Impedance Spectroscopy as a Novel Approach to Probe the Phase Transition and Microstructures Existing in CS:PEO Based Blend Electrolytes

In this work the role of phase transition of PEO from crystalline to amorphous phases on DC conductivity enhancement in chitosan-based polymer electrolyte was discussed. Silver ion-conducting polymer electrolytes based on chitosan (CS) incorporated with silver nitrate (AgNt) is prepared via solution cast technique. Various amounts of polyethylene oxide (PEO) are added to the CS:AgNt system to prepare blend polymer electrolytes. Ultraviolet-visible (UV-vis) spectrophotometry is used to confirm that the blended samples containing AgNt salt exhibit a broad absorption peak. From optical micrograph images it is apparent that small white specs appear on the surface of the samples. The SEM results clearly show the aggregated silver nanoparticles. The enlargement of the crystalline area was observed from the morphological emergence and impedance plots. The phase separation in SEM images was observed at high PEO concentration. The XRD consequences support the morphological manifestation. In this study a new approach is offered to explore the microstructures existing in the blend electrolytes. The width of the semicircle linked to crystalline phase in impedance spectra was found to be increased with the increase of PEO concentration. A slow increase of DC conductivity was observed at low temperatures while above 333 K an immediate change in DC conductivity was obtained. The rapid rise of DC conductivity at high temperatures is correlated with the DSC results and impedance studies at high temperatures.

Magnetic, electric, mechanical, and optical properties of NiCrxFe2−xO4 ferrites

The Ni-Cr ferrites were prepared by the technology sol-gel with participation of auto-combustion (SGA). The effect of Cr3+ ions addition on the microstructure, chemical composition, mechanical, magnetic, optical, dielectric, and electric properties of NiCrxFe2−xO4 ferrites were systematically studied. The added of Cr3+ ions significantly affects the formation of pores and grain size of ferrites. The micro-hardness values decreases from 9.93 GPa to 5.76 GPa with increasing chromium content. The Hall coefficient, conductivity type, concentration of charge carriers, and specific conductivity were found. In Ni-Cr ferrites dc-conductivity increases with Cr-concentration and is within the limits from 2.86·10−5 Ω−1∙m−1 to 1.35·10−2 Ω−1∙m−1. It is shown that with the increasing temperature the conductivity of NiCrxFe2−xO4 ferrites also increases. It is found that at low temperatures the Verwey jump conductivity mechanism is dominant, and in high temperature range the conductivity is described by the band model. The substituted samples showed broad sextet, which is resolved into subsextets, corresponding to tetrahedrally and octahedrally coordinated Fe cations. Experimental Mössbauer spectra of nickel-chromium ferrite powders also contain doublets. Cation distribution calculated using XRD and Mössbauer data indicates a decrease in Fe3+[B]/Fe3+(A) ratio with increasing chromium concentration. The Curie temperature, initial permeability, and saturation magnetization decrease with increasing substitution of Cr3+ ions. The decreasing of saturation magnetization from 33.9 A·m·kg−1 to 7.7 A·m·kg−1 is due to the fact that the Cr3+ ions occupy exclusively B-sites in the spinel structure.

Synchronous γ (Co60) photons and thermal processing induced insulator metal transition in amorphous chalcogenide As4Se3Te3 composition

Amorphous chalcogenide composition AS4Se3Te3 is prepared by conventional quenching technique. The separate annealing or γ quanta irradiation not effect on the dc conductivity properties of the prepared composition. When the prepared samples are subjected to simultaneous annealing at temperature 413 K and γ quanta irradiation the dc conductivity increases. The dark dc conductivity increases by increasing the time of exposure to γ irradiation. At irradiation dose 1.47 × 104 Gy the dc conductivity starts to have metallic like conductivity character. These samples could be used as high temperature γ quanta dosimeter. By applying scaling theory on the samples irradiated with different dose of γ irradiation the critical exponents are determined and found to be < 2. The dark dc conductivity continuously decreases to 0 as temperature tends to zero. The steric value is low in the insulator side of conductivity, but high and almost saturated in the metallic side of conductivity.

Novel insights into electrical transport mechanism in ionic‐polaronic glasses

AbstractTransformation of electrical transport from ionic to polaronic in glasses, which are a potential class of new cathode materials, has been investigated in four series containing WO3/MoO3 and Li+/Na+ ions, namely: xWO3–(30−0.5x)Li2O–(30−0.5x)ZnO–40P2O5, xWO3–(30−0.5x)Na2O–(30.5x)ZnO–40P2O5, xMoO3–(30−0.5x)Li2O–(30−0.5x)ZnO–40P2O5, and xMoO3–(30−0.5x)Na2O–(30−0.5x)ZnO–40P2O5, 0 ≤ x ≤ 60, (mol%). This study reports a detailed analysis of the role of structural modifications and its implications on the origin of electrical transport in these mixed ionic‐polaron glasses. Raman spectra show the clustering of WO6 units by the formation of W–O–W bonds in glasses with high WO3 content while the coexistence of MoO4 and MoO6 units is evidenced in glasses containing MoO3 with no clustering of MoO6 octahedra. Consequently, DC conductivity of tungstate glasses with either Li+ or Na+ exhibits a transition from ionic to polaronic showing a minimum at about 20‐30 mol% of WO3 as a result of ion‐polaron interactions followed by a sharp increase for six orders of magnitude as WO3 content increases. The formation of WO6 clusters involved in W‐O‐W linkages for tungsten glasses plays a key role in significant increase in DC conductivity. On the other hand, DC conductivity is almost constant for glasses containing MoO3 suggesting an independent ionic and polaronic transport pathways for glasses containing 10‐50 mol% of MoO3.

Phase transition and anomalous rheological behaviour of polylactide/graphene nanocomposites

Polylactide (PLA) nanocomposites with graphene nanoplatelet (GNP) contents of 0–15 wt% were prepared and characterised in terms of rheology and electrical conductivity. As expected for rigid nanofillers, GNP incorporation significantly enhanced the viscoelastic properties of the nanocomposites. Furthermore, above a certain GNP concentration the liquid-like melt flow behaviour changed into a solid-like behaviour. However, this rheological percolation threshold was found to decrease from near 9 wt% at 180 °C to below 6 wt% at 220 °C, detected and measured by Van Gurp-Palmen plots and Winter-Chambon method, respectively. It was also found that the viscoelastic properties of some of the nanocomposites increased with increasing temperature, which is in contrast to the rheology of ideal polymeric melts. The Electrical percolation threshold of the PLA/GNP system, which is determined by a sudden increase in DC conductivity and is indicative of establishment of interconnected conductive structures of GNPs within the matrix, was observed to be between 6 and 9 wt% GNPs. Morphological studies also showed physical contact between the platelets at 9 wt% while at 6 wt% they were still separated by the PLA matrix. These observations challenge the attribution of rheological percolation threshold to the formation of a percolating network of only filler particles within the matrix. A percolating network consisting of both polymer chains and filler particles might be the reason for the temperature dependency of rheological percolation threshold in the PLA/GNP system.

Electromagnetic shielding of polypyrrole–sawdust composites: polypyrrole globules and nanotubes

Economic and efficient materials for the shielding of electromagnetic interference are required by many applications. Electrically conducting composite materials based on wood sawdust modified by polypyrrole (PPy) with different morphology, globular and nanotubular, were prepared through in-situ polymerization of pyrrole with the use of iron (III) chloride as an oxidant. The effect of PPy morphology and content in composite with sawdust on the DC conductivity and shielding effectiveness (SE) were investigated. Composites of sawdust with globular PPy demonstrated higher DC conductivity as compared to those with PPy nanotubes as long as PPy content was less or equal to 18 vol.%. Above this concentration the opposite trend was observed. The SE of composites was evaluated theoretically in the radio-frequency range, and measured by waveguide method in the frequency range 5.85–8.2 GHz. The SE increased with increase in DC conductivity, and good agreement between the theoretically calculated SE and experimental results was achieved. The SE of the composites extended over 20 dB level above 18 vol.% PPy at the thickness of the order of 10 μm. Polypyrrole nanotubes perfomed better than globular PPy at high conducting polymer content. The composites are good candidates for the application as shielding materials in the microwave band.

From n = 1 to n = 2 of the Ruddlesden−Popper Phases via Ca-doping and induced effects on electrical and optical properties of La2-xCaxCuO4-δ

The results of the synthesis and characterization of the optimally doped La2xCaxCuO4-δ solid solution within the composition range 0.0 ≤ x ≤ 0.2 and x = 1 are reported. In this study, we have been investigated the effects of Ca contents on the crystal structure, chemical stability, electrical conductivity, magnetic and optical properties of La2xCaxCuO4-δ materials. Preliminary X-ray powder diffraction (XRD) showed the presence of three structural phases in the series belonging to Ruddlesden−Popper Phases. The increase of the symmetry (from orthorhombic towards the tetragonal) for the substitution rate x (Ca) = 15% was evaluated by combined neutron and X-ray powder diffraction. Electrical conductivity measurements show that the appropriate Ca doping in La2CuO4 leads to noticeable increase in low-temperature dc conductivity and oxygen kinetics. The maximum dc conductivity σ = 0.2386 S m−1 at a selected temperature of 280 °C was obtained when x = 0.165. The analysis by the RPE technique shows that all the phases obtained are paramagnetic except the phase with a substitution rate x (Ca) = 15% is diamagnetic.

Dynamical conductivity of confined water

The electrodynamic response of water confined in nanoporous MCM-41 is measured in the frequency range 1 MHz–3 THz at room temperature. The results are analyzed in the context of a recently proposed ionic model of water. We found an increase in dc-conductivity of confined water by 3 orders of magnitude (3.3 · 10−3 Ω−1 · m−1) compared to bulk water (5.5 · 10−6 Ω−1 · m−1). This is attributed to the increase of H3O+ and OH− ion mobility, due to a decrease of the effective potential amplitude by walls of the confining environment. We found that the absorption in the microwave frequency range is much smaller in the medium with confined water than in the bulk water, and the quadratic dependence of the conductivity (σ) on frequency (ω) becomes less steep and tends to σ ~ ω. The results are of fundamental importance and can be used for understanding of the proton transport in systems with water in the nanoconfined state.

Influence of Zn/Co ratio on dielectric behavior of Na2Zn1 ‐ xCoxP2O7 glasses

A series of zinc phosphate glass doped with cobalt Na2Zn(1 − x)CoxP2O7 (x = 0, 1, 2 and 5 mol%) was synthesized. These glasses were characterized by both infrared and large broadband dielectric spectroscopy. Infrared spectra indicate the increase of Zn/Co ratio creates defect in phosphate network due to the depolymeration of phosphate anions. The dc conductivity increases and activation energy decreases with the amount of cobalt ions in the glass network. The impedance measurements reveal that the total conductivity follows Jonscher’s power law. The dielectric constant and dielectric loss increased with the temperature and decreased with the frequency whatever the cobalt proportion.

Occurrence of electrical percolation threshold and observation of phase transition in chitosan(1−x):AgI x (0.05 ≤ x ≤ 0.2)-based ion-conducting solid polymer composites

This paper reports on the investigation of electrical percolation threshold and ion transport mechanism for ion-conducting solid polymer composites based on chitosan. The composite samples were prepared by solution cast technique. The result of DC conductivity versus percolation threshold (\(\varPhi^{ - 1/3}\) ) confirmed that at low AgI concentration, the tunneling effect governs ionic conduction mechanism. Nevertheless, at high filler concentration, the DC conductivity showed a plateau behavior. The DC conductivity as a function of reciprocal temperature revealed that the ion conduction mechanism is slightly temperature dependent and the ion–ion correlational effect is dominant. A steep increase in DC conductivity above 323 K is observed, which indicated the existence of some phase transition near the beta (β)-phase. The drop of DC conductivity at high temperatures is anticipated from the impedance plots. The AC conductivity spectrum exhibited three distinct regions at low temperatures. The high-frequency regions of AC conductivity spectra were almost temperature independent at low temperatures (303–323 K) and obeyed the Jonscher’s power law. The variation in frequency exponent versus temperature reveals that ion conduction mechanism follows QMT and CBH models at low and high temperatures, respectively. The valuable achievement of this work is that the temperature dependence of DC conductivity and the frequency exponent (s) is correlated to interpret the Ag+ ion dynamic and ion–ion correlational effect. The Argand plots were used to explain the relaxation processes.

Lithium-Ion Mobility in Quaternary Boro-Germano-Phosphate Glasses.

Effect of the structural changes, electrical conductivity, and dielectric properties on the addition of a third glass-former, GeO2, to the borophosphate glasses, 40Li2O-10B2O3-(50 - x)P2O5-xGeO2, x = 0-25 mol %, has been studied. Introduction of GeO2 causes the structural modifications in the glass network, which results in a continuous increase in electrical conductivity. Glasses with low GeO2 content, up to 10 mol %, show a rapid increase in dc conductivity as a result of the interlinkage of slightly depolymerized phosphate chains and negatively charged [GeO4](-) units, which enhances the migration of Li(+) ions. The Li(+) ions compensate these delocalized charges connecting both phosphate and germanium units, which results in reduction of both bond effectiveness and binding energy of Li(+) ions and therefore enables their hop to the next charge-compensating site. For higher GeO2 content, the dc conductivity increases slightly, tending to approach a maximum in Li(+) ion mobility caused by the incorporation of GeO2 units into phosphate network combined with conversion of GeO4 to GeO6 units. The strong cross-linkage of germanium and phosphate units creates heteroatomic P-O-Ge bonds responsible for more effectively trapped Li(+) ions. A close correspondence between dielectric and conductivity parameters at high frequencies indicates that the increase in conductivity indeed is controlled by the modification of structure as a function of GeO2 addition.

Rietveld refinement, impedance spectroscopy and magnetic properties of Bi0.8Sr0.2FeO3 substituted Na0.5Bi0.5TiO3 ceramics

We herein presented the investigation on the structural, electrical and magnetic properties of (1−x)(Na0.5Bi0.5TiO3)–x(Bi0.8Sr0.2FeO3) polycrystalline ceramic samples, with x=0.1, 0.3, 0.5 and 0.7. These samples were prepared by conventional solid state reaction method and the crystalline phase of prepared ceramics was identified with the help of X-ray diffraction pattern. Rietveld analysis of the obtained XRD data confirmed that all the synthesized samples adopt the rhombohedral crystal structure with R3c space group. Impedance spectroscopic measurements were performed on all the compositions in the frequency range 10Hz–5MHz to probe the electrical microstructure of polycrystalline (1−x)(Na0.5Bi0.5TiO3)–x(Bi0.8Sr0.2FeO3) ceramics, which changes significantly as a function of x (content of BSFO). A significant increase in dielectric constant has been observed with increase in BSFO concentration, which was attributed to enhancement of oxygen vacancies. Detailed study of impedance complex plane plots revealed the presence of non-Debye type relaxation for all the prepared systems and enabled us to separate the contribution from grains and grain boundaries. Equivalent circuit model (RgCPEg)(RgbCPEgb)(ReCPEe) was employed to explain the impedance data for all the prepared samples. The activation energies obtained from electric modulus as well as dc conductivity increase with increase in BSFO content, which approaches the value 1eV and indicates an Arrehenius type thermally activated process. Remnant magnetization (Mr) and coercive field (Hc) are found to be increase with BSFO concentration.

Dielectric Dispersion and Relaxation in Polymer Blend Based Nanodielectric Film

SummaryPolymer nanodielectrics is the exponential growing field of advanced materials sciences. Such flexible materials have recognized their suitability as substrate and insulator in fabrication of microelectronic devices, and also in preparation of ion conducting solid polymer electrolytes. The nanodielectric film consisted of poly(ethylene oxide) and poly(methyl methacrylate) (PEO–PMMA; 75/25 wt/wt%) blend with 5 wt% montmorillonite (MMT) clay as nanofiller has been prepared by solution‐casting method followed by melt‐pressed technique. The X‐ray diffraction study of the film confirms the intercalated MMT structures in the semicrystalline phase of PEO–PMMA blend. The scanning electron microscopic images confirm the significant variation in morphology of the PEO–PMMA blend on addition of MMT nanofiller. The dielectric relaxation spectroscopy has been employed for measurement of complex dielectric function, ac electrical conductivity and electric modulus spectra of the nanodielectric film in the frequency range 20 Hz–1 MHz. The value of real part of dielectric function of the film is found high at low frequencies due to contribution of electrode polarization effect, but it decreases non‐linearly with the increase of frequency and finally approaches the high frequency limiting value of 2.3 at 1 MHz. The relaxation peak in dielectric loss spectra corresponding to polymer segmental motion is found above 10 kHz, and the peak positions have a shift towards higher frequency side with the increase of temperature. The dc conductivity increases and the relaxation time of the polymer segmental motion decreases with increasing temperature of the nanodielectric film according to the Arrhenius behaviour.

Discussion on the electrical and thermoelectrical properties of amorphous In–Sb–Te Films

Different compositions of (In0.5Sb0.5)1−xTex (0.50 ≤ x ≤ 0.65) thin films were prepared by thermal evaporated technique, onto pre-cleaned glass substrates at ~298 K. Both dark electrical resistivity (ρ) and thermoelectric power (S) were measured in the temperature range 300–420 K. The concentration of the free carriers is obtained from DC conductivity and thermoelectric power measurements. Seebeck coefficient was found to be positive over entire temperature range, indicating that (In0.5Sb0.5)1−xTex films are p-type semiconducting materials. Also, the variation of the mobility with temperature has been estimated. Increasing tellurium concentration is found to affect the DC conductivity and thermoelectric power of the studied films. The activation energies obtained from the DC conductivity and thermoelectric power increase with increasing tellurium content. The obtained results were interpreted according to the chemical bond approach.

Effect of mechanochemical treatment on structure and electrical properties of montmorillonite

This study investigates the effect of grinding on the structure of montmorillonite (MMT). Both XRD and IR analyses indicate a gradual breakdown of the mineral layers and a decrease of the crystallinity with grinding. The prolonged grinding is accompanied with an amelioration of oxidant capacity of MMT which could be attributed to the conversion of structural Fe2+ to Fe3+ cations caused by adsorbed atmospheric oxygen and/or to the exposition of more Fe3+ cation to the surface of the mineral. The evolution of acidity of MMT during grinding has been carried out by determining the point of zero charge (pHpzc) of MMT and the pH of the aqueous suspension of MMT. It was shown that pHpzc increases with grinding from 6.2 to 8.1 respectively for untreated MMT and that ground for 30 min. On the other side the pH of MMT suspension increases from 4.75 to 8.18 respectively for untreated MMT and that ground for 75 min. These two results indicate that acidity of MMT has been lost during grinding. TGA analysis shows that the thermal decomposition of the ground MMT for 90 min takes place in a single step. This behavior has been explained by the formation of less tightly bound hydroxyl groups. Electrical and dielectric properties have been studied using impedance spectroscopy. It has been established that grinding is accompanied by an increase of dc conductivity and dielectric constant in the range of MHz. Moreover, it has been observed a shift of bound water relaxation frequency to lower frequency. These changes could be attributed to the enhancement of mobility of interlayer cations and to the perturbation of the state of interlayer water which could be connected to the defects in the octahedral sheet rather than being entirely localized at the interlayer space of MMT.

Nanoengineering of a Supramolecular Gel by Copolymer Incorporation: Enhancement of Gelation Rate, Mechanical Property, Fluorescence, and Conductivity.

In the quest to engineer the nanofibrillar morphology of folic acid (F) gel, poly(4-vinylpyridine-co-styrene) (PVPS) is judiciously integrated as a polymeric additive because of its potential to form H-bonding and π-stacking with F. The hybrid gels are designated as F-PVPSx gels, where x denotes the amount of PVPS (mg) added in 2 mL of F gel (0.3%, w/v). The assistance of PVPS in the gelation of F is manifested from the drop in critical gelation concentration and increased fiber diameter and branching of F-PVPSx gels compared to that of F gel. PVPS induces a magnificent improvement of mechanical properties: a 500 times increase of storage modulus and ∼62 times increase of yield stress in the F-PVPS5 gel compared to the F gel. The complex modulus also increases with increasing PVPS concentration with a maximum in F-PVPS5 gel. Creep recovery experiments suggest PVPS induced elasticity in the otherwise viscous F gel. The fluorescence intensity of F-PVPSx gels at first increases with increasing PVPS concentration showing maxima at F-PVPS5 gel and then slowly decreases. Gelation is monitored by time-dependent fluorescence spectroscopy, and it is observed that F and F-PVPSx gels exhibit perfectly opposite trend; the former shows a sigmoidal decrease in fluorescence intensity during gelation, but the latter shows a sigmoidal increase. The gelation rate constants calculated from Avrami treatment on the time-dependent fluorescence data manifest that PVPS effectively enhances the gelation rate showing a maximum for F-PVPS5 gel. The hybrid gel exhibit 5 orders increase of dc conductivity than that of F-gel showing semiconducting nature in the current-voltage plot. The Nyquist plot in impedance spectra of F-PVPS5 xerogel exhibit a depressed semicircle with a spike at lower frequency region, and the equivalent circuit represents a complex combination of resistance-capacitance circuits attributed to the hybrid morphology of the gel fibers.

Electrical conductivity and dielectric characteristics of in situ prepared PVA/HgS nanocomposite films

Polyvinyl alcohol (PVA) and mercury sulfide (HgS) polymer nanocomposite were prepared using the solution casting and the in situ chemical reduction of mercury nitrate (Hg(NO3)2) and sodium sulfide (Na2S) in aqueous solutions of PVA as capping for different molar content of Hg(NO3)2 and Na2S. The nanocomposites films were characterized by Fourier transform infrared, X-ray diffraction (XRD), and scanning electron microscopy. The XRD results for the nanoparticles revealed the hexagonal structure of the HgS, (α-phase). The influence of embedded HgS nanoparticles on the conductivity and dielectric properties of PVA films are investigated, over the frequency range 1 kHz–1 MHz, and the temperature range 30–110 °C. The variation of ac-conductivity with a frequency of the films follows Jonscher’s universal power law and found to be increased with increasing temperature, frequency and nanoparticle content. The variation of frequency exponent (s) indicated that the conduction mechanism was correlated barrier hopping model. The dielectric constant (ɛ′), and dielectric loss (ɛ″) was found to decrease with increasing frequency, but increase with increasing temperature and HgS nanoparticles content. The dc-conductivity (σ dc ) increase with increase of HgS concentration, and follows Arrhenius behavior in the investigated temperature region.