Effect Of Graphene Nanoplatelets Research Articles

Effect of graphene nanoplatelets on structural, morphological, thermal, and electrical properties of recycled polypropylene/polyaniline nanocomposites

Recycled polypropylene/polyaniline/graphene nanoplatelets (rPP/PANI/GNPs) nanocomposites were fabricated via ultrasonic-assisted single-screw extruder at 150–170 °C with a rotating screw speed of 50 rpm. The ultrasonic wave frequency and power supply were kept constant at a frequency of 20 kHz and 6 kW, respectively. The composition of the polymer nanocomposites used in this study was 92 wt.% rPP and 8 wt.% PANI, denoted as rPP/PANI. The effects of GNPs loadings (0.5, 1.5, and 3.0 parts per hundred resin (phr)) on the structural, morphological, thermal, and electrical properties on the nanocomposites were systematically evaluated. The X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR) showed the presence of GNPs characteristics at 26.5°, 42.40°, 54.51°, and interactions between GNPs and rPP/PANI nanocomposites at different GNPs loadings. The compatibility of GNPs in rPP/PANI nanocomposites was confirmed by the morphological study, which showed to an enhancement in the electrical properties of the nanocomposites. The results also showed that the incorporation of 3 phr GNPs into rPP/PANI nanocomposites resulted in a lower degree of crystallinity of about 20.8% and a higher electrical conductivity of about 4.1 × 10–1 S cm−1. The current work paves a way towards understanding how to effectively enhance the electrical conductivity of rPP/PANI nanocomposites using GNPs, leading to potential use in electronic applications.

Effect of graphene addition on a borosilicate glass/alumina composite for LTCC technology

The effect of graphene nanoplatelets (GNPs) on the thermal conductivity of low temperature co-fired ceramic (LTCC) materials based on ZnO–B2O3–Na2CO3–Al2O3–SiO2 (ZBNAS) glass/Al2O3 composites sintered at 850 °C for 2 h were systematically investigated. The sintered sheets were prepared by standard tape casting process and solid phase sintering. The microstructure and phase composition of the sintered sheets were characterized by SEM and XRD, respectively. With the addition of 0.75 wt% GNPs, the thermal conductivity of the sintered sheet was increased from 3.91 to 7.85 W/(m·K). Meanwhile, the 0.75 wt% GNPs-Al2O3-ZBNAS glass (GNPs(0.75)/Al2O3/ZBNAS) composite achieved low dielectric constant of 5.16 and dielectric loss of 0.13 at 18 GHz. The coefficients of thermal expansion (CTE) of the sintered sheets decrease first and then increase. The CTE of GNPs(0.75)/Al2O3/ZBNAS composite is −7.13 × 10−6 °C−1 and 3.20 × 10−6 °C−1 at low temperature (25–80 °C) and high temperature (80–200 °C), respectively. The obtained graphene-based LTCC materials are promising candidates in terms of the potential application of electronic devices with high thermal conductivity requirement.

Mechanical properties of poly(lactic acid) compounded with recycled tyre waste/graphene nanoplatelets nanocomposite

This study reports the binary blend of poly(lactic acid) (PLA) with recycled tyre waste (RW) with different compositions. The effect of graphene nanoplatelets (GNP) on the RW/PLA in terms of mechanical and morphology of nanocomposites have been investigated. The sample was prepared by twin-screw extruder with a die of 25 mm width and 0.5 mm thickness. Results show that incorporation of GNP at 1, 2 and 3 phr improves the tensile properties of the RW/PLA blend. It was found that the surface morphologies by Scanning Electron Microscope (SEM) show that the loading of GNP in nanocomposites decreases the formation of void and pores in the blend system.

Effect of Graphene Nanoplatelets on the Structure, the Morphology, and the Dielectric Behavior of Low-Density Polyethylene Nanocomposites.

The incorporation of graphene nanoplatelets (GnPs) within a polymer matrix can play an important role in the physical properties and the functionality of the composite material. Composites consisting of low-density polyethylene (LDPE) and GnPs of different concentrations were developed by mixing GnPs with a molten form of the polymeric matrix. The effect of the GnPs content on the morphological, structural, and electrical properties of the composites were investigated. As shown, graphene presence and its concentration significantly modified the polymer matrix properties, a behavior that can be employed for tailoring its applicability in electrical applications. It was found that the increase of the graphene platelets concentration seems to promote the formation of graphene agglomerates, air gaps, and inhomogeneities, while higher dielectric constant/lower dielectric losses can be achieved.

Effect of graphene nanoplatelets on the dielectric permittivity and segmental motions of electrospun poly(ethylene-co-vinyl alcohol) nanofibers

The influence of the addition of graphene nanoplatelets (GNPs) on the intra/inter – molecular segmental motions of poly(ethylene-co-vinyl alcohol) (EVOH) was assessed by means of dielectric thermal analysis (DETA). The relaxation spectra were studied in terms of the dielectric permittivity (ε′) and the dielectric loss tangent (tan δ) at wide ranges of frequency (from 10−2 to 107 Hz) and temperature (from -150 to 140 °C). Two relaxation zones were disthinguished. Below the glass transition temperature (Tg), two β-relaxations were observed, which are characteristic local modes of mobility of the EVOH side groups, and related to the influence of the different surroundings of ethylene or vinyl alcohol units. At higher temperatures, the dielectric α-relaxation in the vicinities of the glass transition of EVOH was determined. The thermal activation of the β-relaxations was explained by an Arrhenius model, and showed activation energies (Ea) around 55 and 80 kJ·mol−1. The α-relaxation was explained by the Vogel-Fulcher-Tammann-Hesse (VFTH) model. The study of the segmental dynamics showed an increase in the dynamic fragility parameters with the addition of GNPs. The permittivity was increased at preferential concentrations of GNPs. In particular, the addition of GNPs up to 0.5 wt% increased the dielectric permittivity of the electrospun EVOH/GNPs nanocomposite fibers, specially at low frequencies.

The effects of graphene nanoplatelets on the tribological performance of glass fiber-reinforced epoxy composites

Over the last decade, FRP composites have seen increased use in many applications, where an optimum combination of light-weight, better wear resistance and excellent mechanical properties have attributed to their uses in different engineering segments. In this study, Mechanical and tribological properties of woven glass fiber-reinforced epoxy (GFRE) composites with and without graphene nanoplatelets (GNPs) were obtained and correlated. The results of the unmodified GFRE laminates (neat GFRE samples) were compared with those containing 0.5 and 1 wt. % of GNPs (modified samples). Wear resistance of the GFRE composite samples increased with an increase in the GNPs content in the epoxy matrix as obtained by experiments conducted on the Pin-on-disc tribometer. Wear tests showed a considerable reduction in wear rate from 4.54 × 10−11 m3/Nm (neat GFRE) to the lowest value of 2.31 × 10−11 m3/Nm, by adding 1 wt.% GNPs. Further, it was observed that the addition of 0.5 and 1.0 wt. % of GNPs in the base material lowered the coefficient of friction (µ) by about 4% and 18%, respectively, for abrading distance of 200 m, due to the self-lubricating nature of GNPs. The wear mechanisms and transfer film formation were examined using scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) analysis.

The effect of graphene nanoplatelets on technical properties of micro- and nano-sized TiO2 matrix: a comparative research study on electrical and optical characteristics

In this study, titanium dioxide (TiO2)-based graphene nanoplatelets (GNPs)-reinforced composite materials were produced and the electrical and optical properties of the composite materials were investigated. Graphene, which was used as a reinforcing material, was produced by using liquid-phase exfoliation method. While the TiO2 used as matrix material was commercially available for the first group of samples, it was produced by using the sol–gel method for the second group of the samples. Different rates of graphene were added to the TiO2 powders which were commercially available and produced by using sol–gel method. GNPs used as a reinforcing material were subjected to TEM analysis. The resulting composite materials were structurally examined in SEM and XRD. Then, the changes in electrical conductivity of these composites under the impact of temperature were measured. UV–Vis spectrometers of the samples were taken and their optical properties were determined. When temperature-based electrical examination of the produced composite materials was performed, an increase was observed on the electrical conductivity values in both groups of samples as a result of addition of the reinforcing element. In addition, TiO2-containing composites produced by using sol–gel method had lower electrical conductivity comparing with commercially purchased TiO2-containing composites especially at high temperatures. In the optical measurements, it was observed that there was an increase in the optical bandgap energy range values with GNPs reinforcement but a decrease in the reflectance values.

Effect of graphene nanoplatelets on the impact response of a carbon fibre reinforced composite

In the present paper, experimental investigations were conducted to assess the effect of nanomodification on the impact behaviours of hybrid composite plates. Graphene nanoplatelets (GNPs) of two different sizes, 5 and 30 μm, were used to modify a composite material made with 64 wt.% of unidirectional fibres and a low-viscosity epoxy resin. The effect of the nanomodification with 30 μm GNPs was also studied on composite plates prepared with a higher viscosity resin. Three laminate thicknesses (4, 8, and 16 layers) were tested with a standard drop dart testing technique. The peak forces as well as the absorbed energy and the fracture surfaces, observed with a Scanning Electron Microscope (SEM), were compared. Experimental results showed that nano-modification with 5 μm particles had a detrimental effect on both the peak forces and the absorbed energy, whereas the addition of 30 μm GNPs increased the absorbed energy, especially for a laminate thickness of 16 layers. Overall, the experimental results demonstrated that the size of graphene nanoparticles has a significant effect on the impact response of composite laminates.

The effect of graphene nanoplatelets on the flexural properties of fiber metal laminates under marine environmental conditions

In this research, the effects of adding graphene nanoplatelets (GNPs) on the flexural properties of fiber metal laminates (FMLs) under marine environmental conditions were investigated. The FMLs were fabricated with alternating layers of Al6061 and glass fiber reinforced epoxy (GFRE) with different concentrations of GNPs (0.25, 0.5, and 1.0 wt%). The samples were immersed in the 3.5 wt% NaCl solution for different immersion times (7, 14, and 28 days) at room temperature. The addition of GNPs led to decreasing the water absorption of samples after immersion in the 3.5 wt% NaCl solution; the lowest absorbed water was for the samples with 0.25 wt% GNPs. Although the flexural properties of samples decreased by increasing the immersion time, the lowest reduction in flexural properties was obtained for the sample with 0.25 wt% GNPs. Results showed that by adding GNPs and immersing the specimens in the 3.5 wt% NaCl solution for 28 days, the flexural strength and modulus, and strain values of specimens containing 0.25 wt% GNPs were respectively about 128%, 63%, and 1.85 times higher than those of samples without GNPs. Also, the reduction of the flexural properties caused by immersion in NaCl solution was lower than that of samples without GNPs. Moreover, the water uptake of samples with 0.25, 0.5, and 1.0 wt% GNPs was about 38%, 31%, and 37% lower than that of samples without GNPs after 28 days of immersion. Microstructural analyses revealed that the improvements in the metal/polymer adhesion and mechanical properties of the polymeric part of FMLs resulting from various mechanisms were the main reasons for the improved performance of samples with GNPs under marine conditions.

Effect of graphene on the interfacial and mechanical properties of hybrid glass/Kevlar fiber metal laminates

The remarkable resurgence of fiber metal laminates (FMLs) is certainly attributed to the hybrid properties inherent to light metals and fibers reinforced polymer (FRP). There are few reports on the role of nano-size reinforcements in these composites. In this study, the effect of graphene nanoplatelets (GNPs) on the flexural and Charpy impact properties of FMLs of aluminum (Al) 2024 reinforced with hybrid glass/Kevlar fibers-epoxy was investigated. Different wt.% of GNPs (0.0, 0.1, 0.25 and 0.5) and hand lay-up method were used to fabricate nano-FMLs followed by evaluating them in three-point bend and Charpy impact tests. Before making the FMLs, the surfaces of Al sheets were modified to generate surface pores/nano-pores in order to improve the interfacial bonding within the FMLs layers. The FMLs containing 0.1 wt.% GNPs exhibited 10%, 9% and 11% improvement in flexural strength and modulus and impact strength, respectively, compared to the FMLs containing 0.0 wt.% GNPs. Increase of the GNPs to 0.25 wt.% caused a reduction of the flexural strength and modulus and impact strength values; 13.7%, 3% and 25.5% compared to the samples without GNPs. Also increase of the GNPs to 0.5 wt.% decreased these properties to 31.3%, 8.8% and 29.5%. Scanning electron microscopy (SEM) observations of their fracture surfaces showed better adhesion at both polymer/fibers (within the FRP) and Al/FRP interfaces. However, at higher wt.% of GNPs, the FMLs became weaker and more brittle. Agglomerated GNPs at the Al/FRP interface penetrated/filled the surface pores/nano-pores on the Al surfaces. Therefore prevent the polymer penetration in pores, resulting in weak interfacial bond and thus overall weaker and less ductile FMLs. As a result, the Charpy impact values for the 0.25 and 0.5 wt.% GNPs samples were respectively 33 and 37 percent smaller than that for the 0.1 wt.% GNPs sample.

Effects of graphene nanoplatelets on crystallization, mechanical performance and molecular dynamics of the renewable poly(propylene furanoate)

Poly(propylene furanoate), PPF, is a new bio-based polyester produced from renewable resources and belongs in a class of materials expected to replace their fossil-based homologues. Envisaging its future applications, critical is the optimization of the material properties such as the mechanical performance. The latter is strongly connected with the degree of polymer crystallinity, CF, which in the case of PPF is rather slow. As in previous work in semicrystalline polymers, in order to facilitate crystallization we introduce here graphene nanoplatelets at the amounts of 0.5, 1.0 and 2.5 wt% as fillers into the PPF matrix. The study involves measurements by calorimetry (DSC), X-ray diffraction (XRD), nanoindentation testing and dielectric spectroscopy (BDS) on samples in the amorphous (melt quenched) and semicrystalline (annealed) states. DSC confirmed the aimed facilitation of crystallinity, as the crystallization time of PPF at the relatively mild temperature of 100 °C is significantly reduced in the nanocomposites. In next, we were able to estimate the rigid amorphous fraction, RAF, in the two polymer states, i.e. the interfacial polymer due to the fillers and around the formed crystals. The filler addition results in direct improvement of the mechanical performance of the amorphous samples (increase in the elastic modulus and hardness); whereas, upon the additional involvement of crystallization the mechanical properties are improved further. Interestingly, these improvements were found to correlate quite well with the amounts of formed RAF and CF. In addition, we proceed with the exploration of molecular dynamics (local β and segmental α relaxations) of PPF in the bulk and in the presence of the nanofillers, of polymer crystals as well as of introduced water traces. The severe effects on molecular dynamics were found, as expected, to arise from crystallization rather than by the fillers themselves. Results on segmental mobility (calorimetric and dielectric glass transition) were connected to the expected alternations in the semicrystalline morphology, the latter being partially supported by XRD. Finally, in the nanocomposites, an additional filler-induced relaxation was recorded (αf) which demonstrates independency from crystallization, however being influenced by the aforementioned water traces. Most possibly, αf arises from the polymer located at the fillers’ surface.

Role of graphene nanoplatelets and carbon fiber on mechanical properties of PA66/thermoplastic copolyester elastomer composites

In this work, the effect of graphene nanoplatelets (GNPs) on the physico-mechnaical properties of short carbon fiber (SCF) reinforced polyamide 66/thermoplastic copolyester elastomer composites was investigated. The composites were fabricated with extrusion followed by injection molding method. The host matrix, fiber plus host matrix and graphene nanoplatelets loaded hybrid composites were examined for density, hardness, tensile, flexural and impact properties according to the governing ASTM standard. Fiber reinforcement decreased void content to < 1 % but GNPs were able to keep void content under limits. Hardness and impact strength augmented with 2 wt. % graphene nanoplatelets loading, owing to superficial dispersion developing the relationship between the hardness and impact strength. Graphene nanoplatelets loading benefitted the tensile property. However, the same has a deteriorating effect on flexural strength. Flexural modulus increases until 2 wt. %. Improvement in mechanical properties upon GNPs loading is very feeble when compared to the enhancement with SCFs loading to the host. Upon comparing the properties, it was observed that 2 wt. % of graphene nanoplatelets performed admirably and was recognized as an optimum filler loading. Morphology of fractured surfaces was studied by analyzing the scanning electron microscope images to understand the various features and mechanisms.

Effects of Graphene Nanoplatelets and Cellular Structure on the Thermal Conductivity of Polysulfone Nanocomposite Foams.

Polysulfone (PSU) foams containing 0–10 wt% graphene nanoplatelets (GnP) were prepared using two foaming methods. Alongside the analysis of the cellular structure, their thermal conductivity was measured and analyzed. The results showed that the presence of GnP can affect the cellular structure of the foams prepared by both water vapor induced phase separation (WVIPS) and supercritical CO2 (scCO2) dissolution; however, the impact is greater in the case of foams prepared by WVIPS. In terms of thermal conductivity, the analysis showed an increasing trend by incrementing the amount of GnP and increasing relative density, with the tortuosity of the cellular structure, dependent on the used foaming method, relative density, and amount of GnP, playing a key role in the final value of thermal conductivity. The combination of all these factors showed the possibility of preparing PSU-GnP foams with enhanced thermal conductivity at lower GnP amount by carefully controlling the cellular structure and relative density, opening up their use in lightweight heat dissipators.

Effect of Graphene Nanoplatelets (GNPs) Addition on Erosion–Corrosion Resistance of Electroless Ni–P Coatings

Erosion–corrosion is one of the major damage mechanisms incurring higher maintenance cost for hydrocarbon industries. Various damages resulting from service conditions have necessitated protective coatings such as Ni–P. Although Ni–P electroless coatings are known for their corrosion resistance and anti-wear behaviors, still there is a dire need for increasing the anti-wear and anti-corrosion behaviors to expand potential application of Ni–P coatings in oil and gas and petrochemical sectors. In this work, graphene enrichment in Ni–P coating matrix was performed achieving various compositions of ternary Ni–P-graphene coatings through the addition of various concentrations of graphene (30 mg/L, 60 mg/L and 100 mg/L) into electroless plating bath. Surface topography and micro-structural examinations of coatings were conducted. Slurry pot erosion–corrosion testing (using AFS 50–70 silica sand and 3.5 wt% NaCl solution) was employed to characterize the erosion–corrosion behavior of the coatings. SEM analysis was performed on the wear scars to identify the dominant wear mechanisms. Addition of graphene improved the pure erosion and erosion–corrosion resistance. Ni–P-100 mg G coating displayed best slurry pot erosion–corrosion resistance. It is believed that higher hardness, impermeability, and hydrophobic nature of graphene are responsible for improved performance of ternary coatings.

Effect of Functionalized Graphene Nanoplatelets on the Delamination-Buckling and Delamination Propagation Resistance of 3D Fiber-Metal Laminates Under Different Loading Rates.

This paper presents an investigation into the effect of graphene nanoplatelets (GNPs) as a means of improving the impact buckling performance and delamination propagation resistance of a recently developed 3D fiber-metal laminate (3D-FML). One of the highlights of the investigation is the examination of the performance of the GNP-reinforced resin at a sub-freezing temperature (−50 °C). 3D-FML beam specimens were subjected to axial impact of various intensities at room-temperature, while they were subjected to quasi-static axial compression load at the sub-freezing temperature. Moreover, the influence of two different surface preparation methods on the performance of the metallic/FRP interfaces of the hybrid system was also investigated in this study. Although the inclusion of the GNPs in the resin resulted in some gain in the buckling capacity of the 3D-FML, nevertheless, the results revealed that the lack of adequate chemical bond between the GNP-reinforced resin and the magnesium skins of the hybrid material system significantly limited the potential influence of the GNPs. Therefore, a cost-effective and practical alternative is presented that results in a significant improvement in the interfacial capacity.

Effect of graphene nanoplatelets on flame retardancy and corrosion resistance of epoxy nanocomposite coating

Various concentrations of graphene nanoplatelets (GNP) i.e. 0.2, 0.4, 0.6, 0.8 and 1.0 wt. % were incorporated into the epoxy resin by sonication technique and mechanical agitation process. Limiting oxygen index (LOI) test and thermogravimetric analysis (TGA) indicated that the presence of GNP greatly enhanced the flame retardancy properties of the epoxy coating. Salt spray results obtained suggested that the addition of GNP enhanced corrosion performance and reducing the water absorption in comparison with pristine epoxy coating. Adhesion (cross-cut test) revealed that the presence of GNP showed great adhesion to substrates. Incorporation of 0.8 wt. % GNP exhibited the superior anticorrosion performance, great adhesion to subtract, and the lowest water uptake among other samples.

The effect of graphene nanoplatelets on dynamic properties, crystallization, and morphology of a biodegradable blend of poly(lactic acid)/thermoplastic starch

Based on the capabilities of nanographenes in improving the properties of polymeric blends, the effects of graphene nanoplatelets on compatibility, morphology, and crystallinity of the biodegradable thermoplastic starch/poly(lactic acid) (TPS/PLA) blends have been investigated. The localization of graphene nanoplatelets has also been predicted by wetting coefficients. TPS was first prepared and added in various concentrations to the PLA melted in an internal mixer instrument. After that, various amounts of graphene nanoplatelets as 0, 1, 2, and 3 wt% were added to the PLA/TPS blends at two different 90/10 and 70/30 weight compositions. The blends were examined by DMTA, SEM, and DSC tests. The wetting coefficient was evaluated by contact angle measurements to predict the dispersion and localization of graphene nanoplatelets, and also to confirm the predicted results with those obtained by other tests. DMTA results demonstrated that the addition of 1 wt% graphene nanoplatelets into the PLA/TPS blend has increased the compatibility of the two phases. SEM images revealed the dependence of the TPS-dispersed phase particles on the blend composition and amount of graphene nanoplatelets. DSC thermograms showed a reduction in cold crystallization temperature to zero due to the addition of graphene nanoparticles to PLA/TPS blends. Based on the wetting coefficient values, the localization of graphene nanoplatelets was found to be at the interface of PLA and TPS phases.

Effects of graphene nanoplatelets on the tribological, mechanical, and thermal properties of Mg-3Al alloy nanocomposites

AbstractThe present research investigated the tribological and the thermal properties of Mg-3Al-xGNP alloy nanocomposites, fabricated through a powder metallurgy route with microwave assisted sintering followed by hot extrusion. Graphene nanoplatelets (GNPs) were incorporated as reinforcements in different amounts (0.1 wt.%, 0.3 wt.%, and 0.5 wt.%) into pure Mg and Mg-3Al alloy. The values of coefficient of friction and wear rate of pure Mg, Mg-3Al alloy, and Mg-3Al/xGNPs (x = 0.1 wt.%, 0.3 wt.%, and 0.5 wt.%) nanocomposites were evaluated on a pin-on-disc tribometer under dry sliding conditions, and scratch testing was performed under a vertical load of 9.8 N. The ignition temperatures of Mg-3Al-0.1GNP, Mg-3Al-0.3GNP, and Mg-3Al-0.5GNP were respectively increased by 2.31 %, 5.34 %, and 5.7 %. It was noticed that the reinforcement of 0.3 wt.% GNP yielded the best mechanical and tribological properties.

Nucleation of the β-polymorph in Composites of Poly(propylene) and Graphene Nanoplatelets

The effects of graphene nanoplatelets (GNPs) on the nucleation of the β-polymorph of polypropylene (PP) were studied when melt-mixed at loadings of 0.1–5 wt % using a laboratory scale twin-screw (conical) extruder and a twin-screw (parallel) extruder with L/D = 40. At low GNP loadings (i.e., ≤0.3 wt %), the mixing efficiency of the extruder used correlated with the β-nucleating activity of GNPs for PP. GNP agglomeration at low loadings (&lt;0.5 wt %) resulted in an increase in the β-phase fraction (Kβ) of PP, as determined from X-ray diffraction measurements, up to 37% at 0.1 wt % GNPs for composites prepared using a laboratory scale twin-screw (conical) extruder. The level of GNP dispersion and distribution was better when the composites were prepared using a 16-mm twin-screw (parallel) extruder, giving a Kβ increase of 24% upon addition of 0.1 wt % GNPs to PP. For GNP loadings &gt;0.5 wt %, the level of GNP dispersion in PP did not influence the growth of β-crystals, where Kβ reached a value of 24%, regardless of the type of extruder used. From differential scanning calorimetry (DSC) measurements, the addition of GNPs to PP increased the crystallization temperature (Tc) of PP by 14 °C and 10 °C for the laboratory scale extruder and 16-mm extruder, respectively, confirming the nucleation of PP by GNPs. The degree of crystallinity (Xc%) of PP increased slightly at low GNP additions (≤0.3 wt %), but then decreased with increasing GNP content.

Preparation and characterization of conductive Polyaniline/Sago/Graphene nanocomposites via ultrasonic irradiation

This work, which is a part of our ongoing studies on developing Polyaniline/Sago/graphene (P/S/G) nanocomposites. The nanocomposites were synthesized via ultrasonic irradiation (U.I) method in presence of hydrochloric acid and Ammonium persulfate. The quantity of PANI and Sago was kept constant and the effects of graphene nanoplatelet (GnP) dosage on their electrical conductivity and morphology was evaluated. Electrical conductivity measurements using a standard four-point probe technique and morphological analysis was carried using Transmission electron microscopy (TEM). The electrical conductivity of nanocomposites was found to be drastically increased as compared to that of PANI/Sago blend at room temperature. Further the conductivity of nanocomposites was also found to be increased with the increase in weight % of GnP. The results also showed that incorporation of less than 1 wt.% of GnP into polymeric matrix had improved electrical conductivity of the nanocomposites from 2.98×10−4 to 1.34×10−1 S cm−1. The morphology of the generated P/S/G nanocomposites shows uniform dispersion of GnP.