Increment In Electrical Conductivity Research Articles

Enhancing the performance of the perovskite solar cells by modifying the SnO2 electron transport layer

The tin oxide (SnO2) electron transport layer (ETL) plays a vital role in the photo-conversion efficiency (PCE) and stability of organic-inorganic perovskite solar cells (PSCs). However, SnO2 ETL-induced defects such as hydroxyl groups, oxygen vacancies, exposed Sn atoms, and dangling bonds hinder device performance. In this study, rubidium chloride (RbCl) has been used to modify the SnO2 ETL. Perovskite film formed on the RbCl-modified SnO2 ETL exhibits improved crystallinity with enlarged grain size and reduced grain boundaries and enhanced optical absorption. The Hall-effect measurements indicate the improved carrier mobility, and the dark J-V curve shows the increment of electrical conductivity for the RbCl-modified SnO2 ETL. X-ray photoelectron spectroscopy (XPS) results demonstrate the surface defects passivation of the perovskite layer by modifying the SnO2 ETL. A champion PCE of 19.35% has been achieved for the RbCl-modified SnO2 ETL-based devices with improved stability, while the control devices with unmodified SnO2ETL show a PCE of 17.18%.

Synthesis of α-Fe2O3 nano-rod/sheet: Volumetric and electrical conductivity properties of their nanofluids

Physico-chemical properties of synthesized α-Fe2O3 nano-rods/sheets using the co-precipitation method and 3-sulfanylpropane-1,2-diol as a capper and shape-directing agent were studied. The synthesized nanomaterials were characterized using UV–visible, powder X-ray diffraction (pXRD), High-resolution transmission electron microscopy (HR-TEM), Field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), and Thermogravimetry analysis (TGA) techniques. Characterized nanomaterials revealed the formation of the pure rhombohedral crystal structure of nano-rod having a diameter of 33 nm and length of 76 nm, apart from the formation of nano-sheets with a diameter of 86 nm. An average absorption maximum (λmax) of 396.5 nm was observed. The properties of the prepared α-Fe2O3 nanofluids were investigated from 298.15 K to 338.15 K temperatures. The density of nanofluids was observed to increase with an increase in mole fraction of α-Fe2O3 nano-rods/sheets but decreases with an increase in temperature. Excess molar volume data shows positive and negative values revealing van der Waals interactions, packing effect, and hydrogen bonding forces. This volumetric property has revealed a significant impact of intermolecular interactions present in nanofluids on various thermodynamic properties. Results revealed an increment in electrical conductivity with an increase in volume fraction. A maximum enhancement of 2195 % was observed for 0.000728 mol fraction at 338.15 K in ethylene glycol/double-distilled water nanofluid. These electromagnetic nanofluids have great scope for application as smart electrolytes in electronic devices.

Boosting thermoelectric performance of HfSe2 monolayer by selectivity chemical adsorption

In this work, a strategy to boosting thermoelectric (TE) performance of 2D materials is explored. We find that, appropriate chemical adsorption of atoms can effectively increase the TE performance of HfSe2 monolayer. Our results show that the adsorption of Ni atom on HfSe2 monolayer (Ni-HfSe2) can improve the optimal power factor PF and ZT at 300 K, increased by more than ∼67% and ∼340%, respectively. The PF and ZT of Ni-HfSe2 at 300 K can reach 85.06 mW m−1 K−2 and 3.09, respectively. The detailed study reveal that the adsorption of Ni atom can induce additional conductional channels of electrons, enhance the coupling of acoustic-optical phonons and the phonon anharmonicity, resulting in an obvious increment of electrical conductivity (increased by more than ∼89%) in n-type doped system and an ultralow phonon thermal conductivity (1.17 W/mK at 300 K). The high electrical conductivity and ultralow phonon thermal conductivity results in the significant increments of PF and ZT. Our study also shows that, Ni-HfSe2 is a thermal, dynamic and mechanical stable structure, which can be employed in TE application. Our research indicates that selectivity chemical adsorption is a promising way to increase TE performance of 2D materials.

Comparative study of Nd3+, Cr3+-doped Mg-Zn nanoferrites

The present manuscript portrays, the structural, magnetic, and electrical properties of pristine, Neodymium (Nd3+), and Chromium (Cr3+) doped Mg-Zn nanoparticles [Mg0.9 Zn0.1MxFe2-xO4 NPs, where M = 0, Nd3+, and Cr3+] synthesized by autocombustion method. Structural characterization revealed face-centred cubic crystallinity of all the compositions with space group Fd3¯m. Even though Nd and Cr are members of the rare earth and transition metal families, the differences in their ionic radii cause variations in structural properties of Mg-Mn. The dielectric properties showed that AC conductivity increases with increasing frequency for all the compositions but was maximum for Nd3+ doped sample as compared to pristine and Cr3+ doped Mg-Zn nanoparticles. Magnetic hysteresis loop displayed superparagmagnetic behavior with negligible coercivity and retentivity but the value of saturation magnetization was maximum for Nd3+ doped Mg-Mn nanoparticles, and started decreasing with introduction of Cr3+ ions in the host Mg-Mn ferrites lattice framework, depicting improved magnetic properties due to doping of rare earth ions as compared to transition metal ion substitution. Changes in crystallite size of the host Mg-Zn crystal network, by doping rare earth ions as compared to transition metal ion induces an increment in electrical conductivity, and magnetic properties.

Grain boundary engineered, multilayer graphene incorporated LaCoO3 composites with enhanced thermoelectric properties

Enhancement of thermoelectric properties by virtue of decreased electrical resistance through grain boundary engineering is realised in this study. A robust strategy of optimisation of the transport properties by tuning the energy filtering effects at the interfaces by decreasing the interfacial electrical resistance is achieved in LaCoO 3 (LCO). This is accomplished by the incorporation of multilayer graphene within the parent LCO matrix containing multi-scale nano/micro grains. The present work has attained a substantial increment in electrical conductivity from a value of 96 Scm -1 for bare LCO to ∼5300 Scm -1 at 750 K by incorporating 0.08 wt% multilayer graphene in LCO. No significant change in thermal conductivity is observed due to the presence of multilayer graphene in LCO. A zT of 0.33 at 550 K for 0.08 wt% multi-layer graphene incorporated LCO composite is achieved which is the highest thermoelectric figure of merit value for undoped LCO reported until now.

Mechanical, electrical, thermal and tribological behavior of epoxy resin composites reinforced with waste hemp-derived carbon fibers

Short hemp fibers, an agricultural waste, were used for producing biochar by pyrolysis at 1000 °C. The so-obtained hemp-derived carbon fibers (HFB) were used as filler for improving the properties of an epoxy resin using a simple casting and curing process. The addition of HFB in the epoxy matrix increases the storage modulus while damping factor is lowered. Also, the incorporation of HFB induces a remarkable increment of electrical conductivity reaching up to 6 mS/m with 10 wt% of loading. A similar trend is also observed during high-frequency measurements. Furthermore, for the first time wear of these composites has been studied. The use of HFB is an efficient method for reducing the wear rate resistance and the friction coefficient (COF) of the epoxy resin. Excellent results are obtained for the composite containing 2.5 wt% of HFB, for which COF and wear rate decrease by 21% and 80%, respectively, as compared with those of the unfilled epoxy resin. The overall results prove how a common waste carbon source can significantly wide epoxy resin applications by a proper modulation of its electrical and wear properties.Graphical abstract

A Study on the Effects of La/Sm Codoping on the Structural and High Temperature Thermoelectric Properties of n‐Type CaMnO3−δ Perovskite

AbstractOxide thermoelectric ceramics attract extensive research interest due to their excellent thermal stability, non‐toxicity, cost‐effectiveness, and earth‐abundant constituent elements. In the present work, the authors study the effect of lanthanum (La) and samarium (Sm) co‐doping on the structural, microstructural, and thermoelectric properties of CaMnO3 ceramics. The X‐ray diffraction (XRD) studies show an increase in unit cell volume with an increase in Sm concentration. A shift in Raman modes is observed, confirming distortions in MnO6 octahedra with the substitution of rare‐earth elements. The co‐doping strategy leads to a two‐order increment in electrical conductivity and reduction in thermopower as expected due to the increase in Mn3+ and charge carrier concentration. The highest electrical conductivity value attained is ≈200 S cm−1 at around 570 K for La0.025Sm0.1Ca0.875MnO3. The maximum value of thermoelectric power factor achieved is 194 μW m–1 K–2, which is two orders higher than that of the undoped CaMnO3.

Study on clogging mechanisms of constructed wetlands from the perspective of wastewater electrical conductivity change under different substrate conditions

Constructed wetland (CW) has obvious advantages in wastewater treatment of medium and small towns. However, there is a lack of health monitoring research on CW system clogging. The electrical conductivity (EC) of wastewater purified by CW is related to the concentration of pollutants, which can reflect the CW clogging. The objectives of this study are to reveal the mechanisms of CWs substrate clogging from the perspective of wastewater EC changes, and provide an important reference for the health evaluation of CWs. The EC changes of nine CWs substrates (quartz sand, zeolite, gravel, coarse sand, straw biochar, sludge biochar, clay ceramsite, fly ash ceramsite and shale ceramsite) under different conditions (purified water, wastewater and wastewater + NaCl) were tested, and comparative analysis was used to reveal the influence of different substrate materials on the change of wastewater EC. The results show that the adsorption ability of substrate material isn't the main factor affecting the EC of wastewater, and the soluble component in the material is the important factor to cause the difference of EC increment. Under the condition of 0.4–1.0 g L−1 NaCl concentration, the adsorption of substrate materials had little effect on the EC of wastewater, and the effect of NaCl used in CW tracer experiment was good. Quartz sand, coarse sand, gravel and sludge biochar have little influence on the change of wastewater EC. Other materials that have great influence on the change of wastewater EC can be treated by modifying or controlling the mixing ratio. The results are of great significance to reveal the clogging state of CW system and to carry out health assessment research.

Novel α-alumina@CuO-Fe2O3nanofluid for potential application in PEM fuel cell cooling systems: Towards neutralizing the increase of electrical conductivity

In the present study, the surface of α-alumina nanoparticles was modified with CuO and Fe2O3 through a surface deposition route. Different aqueous nanofluids of pure α-alumina (Al) and α-alumina@CuO-Fe2O3 (CuFeAl) nanoparticles, each with three weight percent of 0.1, 0.2 and 0.3, were prepared with various amounts of sodium dodecyl sulfate (SDS). An adequate amount of SDS was determined by measuring the electrical conductivity (EC) of the synthesized samples and DI water to cap the charged surface of the nanoparticles. Through investigating heat transfer performance and viscosity measurements for the synthesized nanofluids, significant heat transfer improvement was observed for the ones with sufficient SDS. The CuFeAl 0.3-water nanofluid with a sufficient SDS content showed 21.4 % heat transfer enhancement. In addition, such nanofluid resulted in the EC value as low as DI water (6 μS/cm) through neutralizing the EC increment, which potentially can be applied in PEM fuel cell cooling systems.

Transition of charge transport phenomena from 3D to 1D hopping at low temperatures in polyaniline/graphene composites

Here, we present the charge transport properties of polyaniline/graphene composites prepared by a chemical oxidation method in the presence of four different loading concentrations (2, 4, 6, and 8 wt. %) of graphene. The synthesized materials are characterized for surface and chemical bonding analyses through field-emission scanning electron microscopy and Fourier transform infrared spectroscopy techniques, respectively. The change in the chemical structure of the prepared composites with graphene loading concentrations revealed the possible increment in electrical conductivity. The room-temperature dc conductivity of the prepared composites was found to increase from ∼22 to 217 S/cm with an increase in the loading concentration of graphene from 2 to 8 wt. %. The temperature-dependent electrical conduction behavior of the prepared samples is investigated under Mott's variable-range hopping conduction mechanism. It is found that all composite samples follow three-dimensional (3D) hopping in the higher temperature region (>44 K), which transforms into one-dimensional (1D) hopping at lower temperatures (<44 K). A decrease in hopping distance (1.07–0.96 nm) and an increase in density of states (3.20 × 1021–4.95 × 1021 cm−3 eV−1) in three dimensions with an increase in the graphene loading concentration from 2 to 8 wt. % suggest the requirement of lower hopping energy (61.3–55.5 meV) for conduction. The estimated hopping parameters also revealed a nonadiabatic small-polaron hopping conduction mechanism that is followed by the charge carriers in the present samples for both one- and three-dimensional variable range hoppings.

Electrochemical and Microstructural Investigation of in-situ Grown CNTs Network on Carbon Paper as Electrocatalytic Electrode for Fuel Cells

In this study, carbon nanotubes (CNTs) were deposited directly on impregnated Fe/carbon paper (CP) substrate (CNT/CP) utilizing chemical vapor deposition (CVD) process with the aim of using them as electrocatalytic electrode. The influence of wet impregnation conditions and CVD growth parameters on the characteristics of CNTs was investigated. Field emission scanning electron microscopy (FESEM), Energy dispersive spectroscopy (EDS), Transmission electron microscopy (TEM) and Raman spectroscopy were applied to characterize nucleation, growth and morphology of CNTs on CP. Measurement of Contact angle (CA) determined 125.9 and 145.0 ⁰C for CP and CNT/CP that displayed an increase in water repellence and degree hydrophobicity of CNT/CP to 15% than CP. Electrochemical impedance spectroscopy (EIS) analysis indicated the reduction of electrode charge transfer resistance from 5000 ohm value from CNT/CP to ohm value for CP that shows the increment in electrical conductivity of CNTCP. Half-cell test analysis represented that the improvement of performance and the increase of power density to ⁓8 % for Pt/CNT/CP compared to commercial catalyst Pt/C/CP (20 wt%) even with about 42% less Pt loading, can be attributed to strong adhesion of in-situ CNTs to the CP and lower agglomeration of CNTs along with outstanding electrical and thermal conductivity of CNTs. The obtained results indicated that the proposed nanostructure serves as a promising candidate for many technological applications specially carbon nanotube-supported catalyst.

Review on the electrical conductivity of nanofluids: Recent developments

This review paper focuses on the recent developments in theoretical and experimental research studies carried out to examine the electrical conductivity of different types of nanofluids. Based on it, various parameters that affect the electrical conductivity of nanofluids, namely the structure/shape and size of nanomaterials, temperature, preparation methods, instruments, surfactant, and volume concentration has been studied. It was found that the rise in volume fraction and the temperature of nanomaterials generally led to increment in electrical conductivity of all nanofluids.

Altered crystal structure of nickel telluride by selenide doping and a poly(N-methylpyrrole) coating amplify supercapacitor performance

Nickel telluride doped with selenide (NiTe:Se) flakes show remarkably enhanced charge storage response compared to undoped NiTe. Se doping induces a morphological transformation from fibrillar NiTe to flaky NiTe:Se thereby endowing a two times higher surface roughness and an eight-fold increment in electrical conductivity to the latter, thus allowing facile charge transport and transfer across the material. Free charge carrier density available for conduction for NiTe:Se is also found to be double of that of NiTe. These beneficial effects combinedly translate into a capacity of 565 C g−1 (equivalent to a specific capacitance (SC) of 943 F g−1) for the single NiTe:Se electrode, which is 1.5 times greater than the NiTe electrode. The homogeneity of Se dispersion in the NiTe matrix is confirmed by magnetic force microscopy, where the prominent magnetic domains observed to be uniformly distributed across the surface of NiTe are obliterated homogeneously after Se doping. Asymmetric supercapacitor with activated carbon (AC//NiTe:Se) delivers a 300 C g−1 and this performance is bettered by coating a poly(N-methylpyrrole) (PMP) layer at the electrodes, where the polymer also contributes to charge storage and also assists in preserving the structural integrity of the active materials. The ensuing PMP@AC//PMP@NiTe:Se supercapacitor delivers a capacity of 404 C g−1, Emax and Pmax of 90 Wh kg−1, and 400 W kg−1, superior to the AC//NiTe:Se cell. Practical demonstration of the PMP@AC//PMP@NiTe:Se with a 3S (series), 4.5 V configuration, coupled with the ease of fabrication and scale-up open up avenues to develop this cell as a commercial product.

Estrogenic Hormones in São Paulo Waters (Brazil) and Their Relationship with Environmental Variables and Sinapis alba Phytotoxicity

The present study evaluated the relationship between estrogenic hormone concentrations (17α-ethinylestradiol and 17β-estradiol) in surface waters in the Metropolitan Area of São Paulo (Brazil) and environmental variables. Four sampling stations were monitored ranging from a protected area to streams discharging human effluent in and around Billings Reservoir. Four sampling campaigns were carried out in each seasonal period: dry and wet. Samples for hormone analysis (in ng L−1) were concentrated (1000×) using solid-phase extraction C18 cartridges and analyzed by liquid chromatography coupled to quadrupole mass spectrometry detection, with 100 ng L−1 limit of quantification. Water temperature, pH, electrical conductivity (EC), and total dissolved solids were determined in situ; total phosphorus and Sinapis alba bioassays were performed subsequently. Reservoir active capacity (AC) and precipitation were also obtained. Estrogenic hormone concentrations were always below limit of quantification at pristine site; at the other sampling stations, 17β-estradiol concentrations varied from below limit of quantification to 1720 ng L−1 and 17α-ethinylestradiol from below limit of quantification to 1200 ng L−1, with the highest concentrations found in the streams discharging into the reservoir. These streams showed higher Pearson’s correlation between 17α-ethinylestradiol, total phosphorus, and electrical conductivity when compared with reservoir stations. Germination index and EC presented negative correlation (Pearson’s r = − 0.61), denoting a phytotoxicity increase with EC increment. AC influenced the dilution of pollutants and showed negative correlations with total phosphorus (Pearson’s r = −0.56). These results highlight the relevance of including streams in water-monitoring programs, since they are important pollutants loads into watersheds.

White Electroluminescence from Aluminum Zinc Oxide Embedded in Poly(9‐vinylcarbazole)

AbstractSimple methods for manufacturing white light‐emitting diodes (WLEDs) based on ZnO are still challenging researchers. Solution processed WLEDs based on Al doped ZnO (AZO) nanoparticles embedded in PVK (hybrid system) are demonstrated here, and PL studies of the hybrid system suggest that defects in AZO and PVK/AZO interface are likely to be the origin of white EL. Besides electrical conductivity increment, AZO provided the emissive layer with a more balanced charge injection; thus, the threshold voltage reduced from 8.1 V to 7.5 V and EL enhanced from 4.47 cd/m2 to 18.69 cd/m2 at 10 V, for the pure PVK compared to the hybrid system, respectively.

Bioremediation of Refinery Effluent by Consortium of Bacteria Isolated from Abattoir Waste

Aim: This research was conducted to examine the efficacy of bioremediation of refinery effluent by a consortium of bacterial organisms from abattoir waste.
 Study Design: The experimental and analytical research designs were adopted for the study.
 Place and Duration of Study: The study was conducted in a laboratory in the Department of Environmental Management and toxicology, Federal University of Petroleum Resources, Effurun, Delta State, Nigeria. The research was conducted within three months.
 Methodology: Standard methods were adopted for sample collection, microbiological analysis and determination of physicochemical properties.
 Results: Out of eight bacterial species isolated from abattoir waste, Pseudomonas, Proteus and Bacillus species recorded high hydrocarbon utilization potential. There was a significant difference between the physicochemical property of the control and the refinery effluents. The effluents had a mean Biochemical Oxygen Demand (BOD) of 19 mg/l, Dissolved Oxygen (DO) of 3 mg/l, Total Dissolved Solids (TDS) of 35 ppm, pH of 6.67, Electrical Conductivity (EC) of 71 µs/cm and temperature of 29.5°C. Samples subjected to 0 – 10 days biodegradation test by Pseudomonas, Proteus and Bacillus species recorded a mean increment in EC, reduction in pH, increase of TDS and reduction in Total Petroleum Hydrocarbon (TPH) with Proteus species being the best. The percentage of degradation by Proteus was 69.7%, Bacillus 61.56% and Pseudomonas 53.19%.
 Conclusion: The use of abattoir waste bacteria for bioremediation purposes are very safe, cost-effective and aids the environment from accumulating more burdens of unsafe compounds that render it harmful for living organisms including man.

Enhanced thermomechanical and electrical properties of multiwalled carbon nanotube paper reinforced epoxy laminar composites

Thermomechanical and electrical properties of multiwalled carbon nanotubes (MWCNTs) bucky paper reinforced epoxy laminar composites have been studied. Incorporation of bucky paper in epoxy matrix led to improvement in thermomechanical properties but it reduced through-plane electrical conductivity. Therefore, 0.05 wt.% of MWCNTs is incorporated as secondary network in epoxy matrix to improve the electrical conductivity. The storage modulus for a 0.05 wt.% dispersed MWCNTs in epoxy resin impregnated 20 plies of bucky paper based composites (20Ply.05) was 4.84 GPa as compared to 2.24 GPa of pure epoxy. The glass transition temperature of 20Ply.05 laminar composite reaches to 191.6 °C as compared to pure epoxy (168.5 °C). The increment in electrical conductivity (792%) is reflected in improved electromagnetic shielding effectiveness (SE) over a wide frequency range of X & Ku band. The SE of more than 50 dB for 20Ply.05 laminar composite in both the bands was obtained.

Structural Characterization and Electrical Conductivity of Mechanically Alloyed 10mol% In2O3–Doped CeO2 Nanoparticles

Method: Nanocrystalline powder of 10 mol% indium oxide doped ceria is synthesized by mechanically alloying the stiochiometric powder mixture of CeO2 and In2O3 within 5 h of milling in open air. Further milling up to 8 h confirms the stable cubic structure of the compound with increase in milling time. Objective: Detailed structure and microstructure of the compound have been characterized by Rietveld powder structure and microstructure refinement method using XRD data and analyzing HRTEM images. Effect of In2O3 doping on electrical conductivity of nanocrystalline CeO2 is studied by measuring the electrical conductivity of the compound in the temperature range 300°C-600°C. The DC conductivity of doped ceria (σdc ~ 3x10-4 S/cm at 540°C for doped ceria) has been enhanced to ~100 times in comparison to that of the undoped ceria (σdc ~ 4x10-6 S/cm at 540°C) nanoparticles has been found. Conclusion: This significant increment in electrical conductivity has been interpreted through the microstructure characterization of the doped compound. Keywords: Oxides, milling, defects, x-ray diffraction, microstructure, electrical conductivity.

High-performance carbon nanofiber coated cellulose filter paper for electromagnetic interference shielding

A high-performance electromagnetic interference (EMI) shielding material based on carbon nanofiber (CNF) and cellulose filter (CF) paper has been fabricated by a cost-efficient and convenient dip-coating method. The EMI shielding performance of the CF papers with micron level thickness tolerance (2.5–12.7 µm) have been explored by considering the microstructure, serviceability, electrical conductivity, and number of dip-coating cycles. Field emission scanning electron microscopy of the surface and edge of the composites support the good electrical conductivity, which showed distinct increment in electrical conductivity from 6.6 × 10−7 to 0.85 S/cm. The number of dip-coating cycles have a significant impact on electrical conductivity, and this has also been studied and inferred after alteration of dipping cycles. The electromagnetic shielding efficiency of CNF-coated CF paper exhibits 24.6 dB with only 25 dip coating cycles. Moreover, from commercially viable points of view, extensive study has been executed to investigate CNF-coated CF papers in the simulated ageing environments viz. water, thermal ageing, and thermo-degradability over a wide range of temperature (ambient to 600 °C). All the environmental factors have been simulated on a laboratory scale. The CNF-coated CF papers possess significantly higher mechanical properties than pure CF paper. This type of conductive CNF-coated CF paper is a promising candidate to be used as highly flexible, lightweight, and cost-efficient EMI shielding material in advanced multifunctional application areas.

Synthesis and characterization of hybrid PANI/MWCNT nanocomposites for EMI applications

The present study reports on a simple and very efficient solution mixing method for the preparation of functionalized multiwalled carbon nanotube/polyaniline nanocomposites (f‐MWCNT/PANI) for electromagnetic interference (EMI) application. The synthesized composites have been characterized by different physiochemical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffractometry (XRD), and Fourier transform infrared (FT‐IR) spectroscopy. The electron microscopy analysis of nanocomposites reveals the good dispersion and agglomeration of CNT in PANI matrix at higher concentration. X‐ray study shows the higher crystallinity of PANI with the addition of f‐MWCNT. FTIR spectroscopy has confirmed the interactions of the carbonyl group of f‐MWCNT with the quinoid ring of PANI. The resulting f‐MWCNT/PANI nanocomposites (0 to 21 vol% CNT) shows higher electrical conductivity than that of pure PANI due to the formation of conducting path between CNT and PANI matrix. The increased electrical conductivity of nanocomposites also improved the estimated EMI shielding. The percolation threshold was found to occurs at 0.1 vol% of f‐MWCNT, where the DC electrical conductivity started to increase abruptly. The one‐order increment in electrical conductivity was observed which is 12 times more than that of pure PANI. The DC electrical conductivity of nanocomposite at 3.3 vol% and 13.9 vol% of f‐MWCNT was 1.6 × 10−1 S/cm and 1.8 × 10−1 S/cm, respectively. In addition, the estimated EMI shielding of nanocomposites at 3.3 vol% of f‐MWCNT and beyond it was found to be 12dB. POLYM. COMPOS., 39:3858–3868, 2018. © 2017 Society of Plastics Engineers