Dispersion Of Graphene Oxide Nanosheets Research Articles

The role of organic solvent and nano-additives loading in preparing and characterizing graphene oxide based polystyrene nanocomposites

ABSTRACT In this work, two types of organic solvents: namely, dimethylformamide (DMF) and tetrahydrofuran (THF); were investigated individually to prepare graphene oxide (GO) based polystyrene (PS) nanocomposites. Both were effective exfoliation agents for GO nano-sheets using sonication process. However, DMF showed poor solubility for PS beads compared to THF due to its high boiling point, poor volatility, and the prevailing monomer–monomer interaction rather than monomer–solvent interaction. Hot pressing was not an efficient preparatory approach for those samples prepared by DMF. Hence, solution casting, and THF were adopted to prepare PS and its GO-based nanocomposites. (0.5 and 1.0) wt. % of GO were dispersed homogeneously in PS using different dispersive techniques. Range of properties were tested for the pure polymer and its GO-based nanocomposites prepared by THF. A good dispersion of GO nano-sheets in PS was observed by different microscopic techniques. A significant improvement of mechanical and thermo-mechanical (storage modulus) performances for the polymer nanocomposites (PNCs) were achieved compared to the pure polymer. Young’s modulus for PS/GO nanocomposites was improved by 122% and 143% for GO loadings of 0.5 and 1.0 wt. %; respectively, and storage modulus for the nanocomposites recorded a considerable promotion compared to the pure polymer.

Nanomechanical behavior of polystyrene/graphene oxide nanocomposites

The in-situ investigation of the nanomechanical features of the polymer graphene nanocomposites has become a challenging and an indispensable task to achieve the required application. Graphene oxide (GO) nanocomposites were prepared at 1.0% weight fraction of GO to reinforce polystyrene (PS) using solution blending approach. The morphology of the resulting nanocomposites was characterized by optical, scanning electron, transmission electron, atomic force, and scattering scanning near-field optical microscopies. These showed a uniform dispersion of graphene oxide nano-sheets in the PS matrix. By adopting Derjaguin–Muller–Toporov (DMT) formula, the nanomechanical properties for the cryogenically fractured surface of the composites were characterized using the traditional atomic force microscopy (AFM), peak-force quantitative nanomechanical mapping (QNM), and tip-force mode functioned with scattering scanning near–field optical microscopy (s-SNOM). Young’s modulus of the PS matrix varied around (1–2) GPa as shown by QNM and s-SNOM similar to what was reported in the literature. However, while putative GO nano-sheets were measured to have a higher elastic modulus than the surrounding matrix in Peak-Force QNM experiments, they were significantly below literature values. By using Tip-Force mode related to s-SNOM, the expected values of Young’s modulus for GO were recovered.

Effect of graphene oxide loading on the performance of melanized corn oil based polymeric nanocomposite coatings

AbstractIn this work, melanized corn oil (CO)‐based polymer was synthesized and was further engineered using three different ratios of graphene oxide (GO). The polymer nanocomposite thus formed was evaluated using various standard techniques to check the efficacy of GO nanosheets on the overall coating performance. Fourier transform infrared and x‐ray photoelectron spectroscopy techniques helped in structural elucidation of the prepared resins. The thermal stability of melanized CO based dihydroxy compound (CmDHC) was found to enhance up to 315°C on the incorporation of 0.5 wt% GO nanosheets. Furthermore, the scanning electron microscopy results revealed that incorporation of GO improved the surface roughness of CmDHC@GO2 nanocomposite coatings. This amplified surface roughness resulted in increased hydrophobicity with contact angle value of 78° as well as excellent corrosion resistance of 29.5 × 106 Ω cm2. The overall results suggest that dispersion of GO nanosheets into the polymer matrix helped to improve the mechanical, thermal as well as corrosion resistance performance of these coatings and 0.5 wt% was the optimum amount required for the same.Highlights GO nanosheets were dispersed in melanized CO‐based polymer matrix. Incorporation of GO nanoparticles in CmDHC polymer matrix enhanced the coating resistance almost 30 times. GO inhibited the corrosive ions effectively that resulted in excellent corrosion resistive performance. 0.5 wt% GO was the optimum amount to produce torturous path for corrosive ions. Overall CmDHC@GO2 nanocomposite exhibited excellent coating performance.

Experimental Investigations of AlMg3 Components with Polyurethane and Graphene Oxide Nanosheets Composite Coatings, after Accelerated UV-Aging.

The use of graphene (Gr) and its derivates graphene oxide (GO) showed that these materials are good candidates to enhance the properties of polyurethane (PU) coatings, especially the anticorrosion ones since graphene absorbs most of the light and provides hydrophobicity for repelling water. An important aspect of these multifunctional materials is that all these improvements can be realized even at very low filler loadings in the polymer matrix. In this work, an ultrasound cavitation technique was used for the proper dispersion of GO nanosheets (GON) in polyurethane (PU) resin to obtain a composite coating to protect the AlMg3 substrate. The addition of GON considerably improved the physical properties of coatings, as demonstrated by electrochemical impedance spectroscopy (EIS) analysis, promising improved anticorrosion performance after accelerated UV-ageing. Computational methods and Differential Scanning Calorimetry (DSC) measurements showed that GON facilitates the formation of additional bonds and stabilizes the PU structures during the ultraviolet (UV) exposure and aggressive attack of corrosive species. Limiting oxygen index (LOI) data reveal a slow burning behaviour of PU-GON coatings during UV exposure, which is better than PU alone.

Structure and properties of polystyrene/graphene oxide nanocomposites

The addition of graphene as an efficient nano-filler to different polymer matrices lead to a substantial improvement in different physical properties which, as a result, pave the way towards promising applications. In this work, Polystyrene (PS) was reinforced with different low loadings of graphene oxide (GO). The latter was prepared according to the Hummers method. The incorporated weight fractions were (0.01, 0.05, 0.1, 0.25, 1.0) wt. %. Solution blending was the adopted approach to prepare the nanocomposites. The resulted nanocomposites were characterised compared to the neat polymer. Many tools were employed to investigate the structure, morphology, thermal, and thermo-mechanical behaviour of GO, neat polymer, and the nanocomposites. The structural and morphological outcome for GO and PS was confirmed compared to the literature. The outcome confirmed as well the good dispersion of GO nano-sheets in the PS. The thermal and thermo-mechanical properties were enhanced for the nanocomposites compared to the neat polymer. The results emphasised the improvement of nanocomposites' performance as the inclusion of GO went higher.

Rapid In Situ Polymerization of Polyacrylonitrile/Graphene Oxide Nanocomposites as Precursors for High-Strength Carbon Nanofibers.

Graphene oxide (GO) has been widely used as an additive of polyacrylonitrile (PAN)-based carbon nanofibers (CNFs) to optimize its crystal structure and improve the mechanical performances of nanofibers. However, the homogeneous dispersion of GO nanosheets among entangled PAN molecular chains is always challenging, and the poor dispersion of GO severely limits its positive effects on both the structure and performances of CNFs. Considering this issue, this paper provides for the first time an effective solution to achieve rapid and uniform introduction of GO in PAN-based nanofibers via in situ polymerization, and the optimization of the nanofiber structure by GO is systematically studied in three consecutive stages (polymerization, electrospinning, and carbonization) of the production process. During in situ polymerization, PAN is tightly attached on GO nanosheets to form PAN/GO nanocomposites, and this interaction is maintained throughout the spinning process. Not only the arrangement of PAN molecular chains but also the crystal size of the final turbostratic structure of CNFs is considerably improved by the interaction between PAN and GO. Besides, the direct proof that GO nanosheets promote the crystallization and orientation of the nanofiber matrix is presented. As a result, the tensile strength of CNFs is remarkably increased by 2.45 times with 0.5 wt % addition of GO. In summary, this paper provides a method for efficiently introducing nanoscale additives into PAN-based nanofibers and gives insights into the production of high-performance CNFs with the addition of GO.

Enhancing electrical, mechanical, and thermal properties of polybenzimidazole by 3D carbon nanotube@graphene oxide hybrid

In the present work, comparison of electrical conductivity , mechanical properties and thermal stability of graphene oxide (GO), multi-walled carbon nanotubes (MWCNTs) and GOMWCNT hybrid reinforced polybenzimidazole (PBI) nanocomposites prepared via one-pot in situ polymerization have been carried out. The influences of the nanofillers content and mass ratio of GOMWCNT hybrid on the tensile performances and dc conductivity of nanocomposite films were evaluated. In contrast to single-phase GO and MWCNTs, the incorporation of GOMWCNT (mass ratio of 1:1) hybrid into PBI matrix endows optimum dispersion of GO nanosheets and MWCNTs together with better synergistic enhancing effects on the resultant performances of nanocomposites. Both tensile strength and dc conductivity of the GOMWCNT/PBI (1:1) nanocomposites enhanced remarkably with addition of 0–5 Wt% GOMWCNT, followed by petty improvement at higher filler content. The highest dc conductivity of 2.43 × 10 −5 S/cm was achieved at 10 Wt% loading of GOMWCNT (1:1) in PBI. The dc conductivity was further enhanced to 1.06 × 10 −3 S/cm upon thermal annealing at 400 °C. The tensile strength showed 3-fold increase and the Young's modulus was enhanced by 12-fold with respect to the pure PBI. The reinforcing efficiency of GOMWCNT was predicted using the modified Halpin-Tsai modeling. This work provides a simple method to prepared GOMWCNT/PBI nanocomposite with high electrical conductivity and mechanical properties, which could be explored in potential applications in aerospace structure and aerospace electronics. • Polybenzimidazole nanocomposites reinforced with GO-MWCNT hybrid. • Nanocomposite with excellent dc conductivity, tensile strength and modulus. • Nanocomposite films could be useful for flexible electronic devices.

Polydopamine functionalized graphene oxide nanocomposites reinforced the corrosion protection and adhesion properties of waterborne polyurethane coatings

In this work, a polydopamine (PDA)-functionalized graphene oxide (GO) nanocomposite was prepared by a simple and eco-friendly approach. The results recorded via FTIR, UV–vis absorbance spectroscopy, Raman, XPS spectral, as well as atomic force microscope (AFM) demonstrated the effective modification and overlay of PDA on the surface of GO. GO-PDA can be stably dispersed in aqueous solution, and GO-PDA was incorporated into waterborne polyurethane (WPU) by solution blending. The examinations of particle size analysis and zeta potential showed that the incorporation of GO-PDA can effectively improve the uniformity and stability of polyurethane aqueous dispersion. The observation results of SEM verified that PDA promoted the uniform dispersion of GO nanosheets in polymer coatings. The electrochemical impedance spectroscopy and salt spray test of the steel substrates coated with composite coatings confirmed that the incorporation of 0.5 wt% GO-PDA significantly enhanced the anti-corrosion performance of WPU. Compared with previous reports, the incorporation amount of GO-PDA was drastically reduced, and the corrosion protection of coating was effectively improved. In addition, the pull-off and contact angle tests also demonstrated improved adhesion strength and hydrophobicity of the coating. Only water was used as solvent in the whole preparation process of coating and its excellent corrosion protection make it promising in engineering.

Novel Bioactive and Antibacterial Acrylic Bone Cement Nanocomposites Modified with Graphene Oxide and Chitosan.

Acrylic bone cements (ABCs) have played a key role in orthopedic surgery mainly in arthroplasties, but their use is increasingly extending to other applications, such as remodeling of cancerous bones, cranioplasties, and vertebroplasties. However, these materials present some limitations related to their inert behavior and the risk of infection after implantation, which leads to a lack of attachment and makes necessary new surgical interventions. In this research, the physicochemical, thermal, mechanical, and biological properties of ABCs modified with chitosan (CS) and graphene oxide (GO) were studied. Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (1H-NMR) scanning electron microscopy (SEM), Raman mapping, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), compression resistance, mechanical dynamic analysis (DMA), hydrolytic degradation, cell viability, alkaline phosphatase (ALP) activity with human osteoblasts (HOb), and antibacterial activity against Gram-negative bacteria Escherichia coli were used to characterize the ABCs. The results revealed good dispersion of GO nanosheets in the ABCs. GO provided an increase in antibacterial activity, roughness, and flexural behavior, while CS generated porosity, increased the rate of degradation, and decreased compression properties. All ABCs were not cytotoxic and support good cell viability of HOb. The novel formulation of ABCs containing GO and CS simultaneously, increased the thermal stability, flexural modulus, antibacterial behavior, and osteogenic activity, which gives it a high potential for its uses in orthopedic applications.

Functionalized magnetic biopolymeric graphene oxide with outstanding performance in water purification

Graphene oxide (GO) is an attractive material for water treatment, although its high surface energy restricts its practical application. To overcome this challenge, we have developed a well-dispersed and interconnected, functionalized biopolymeric GO with magnetic activity, namely, cl–CS–p(MA)/Fe3O4NPs. This three-dimensional, sponge-like nanostructured material is composed of graphene oxide nanosheets dispersed in functionalized chitosan/poly(methacrylic acid) and is cross-linked with in situ-developed Fe3O4 nanoparticles. Methacrylic acid (MA)-functionalized chitosan (CS) cross-linked with N,N-methylenebis(acrylamide) (MBA), designated as cl–CS–p(MA), facilitates the stable dispersion of GO nanosheets, providing a proper solid matrix for the generation of well-dispersed in situ Fe3O4NPs. The methodology allows for the generation of numerous binding sites with an interconnected morphology, facilitating the rapid uptake of a cationic dye in significant quantity, e.g., methylene blue (MB), which is used as a model water pollutant. In this work, the structural architecture of cl–CS–p(MA)/Fe3O4NPs was characterized with multiple approaches, and the adsorption mechanism was revealed to be an electrostatic interaction. The synthesized nanocomposite showed significant recyclability and structural stability. Adsorption equilibrium was achieved within 20 min, and the maximum adsorption capacity was 2478 mg/g for MB, surpassing the values reported for any other adsorbents to date.

Interaction and thermal studies on graphene oxide in NC/DEGDN/GO nanocomposites.

Before considering the uses of graphene oxide (GO) in nitrate ester-based materials for performance and safety improvement, its interaction, compatibility and dispersion with the host matrices need to be well understood. This work addresses the interaction and dispersity of GO with nitrocellulose (NC)/diethylene glycol dinitrate (DEGDN)-based nanocomposites. The GO and DEGDN were successfully synthesised and characterised. The NC/DEGDN proved to be a good hosting matrix for the dispersion of GO nanosheets. Analysis of atomic force microscopy (AFM) showed that the thicknesses of dispersed GO were in the range of 1–4 nm suggesting that the GO in the nanocomposite consists of 1–2 layers for a 0.5% w/w GO containing nanocomposite and 2–4 layers for a 0.75% w/w nanocomposite. ATR-FTIR spectroscopy analysis established red-shifting of 744 to 752 cm−1 for the O–NO2 bond stretching vibrations, indicating bond stabilization by donor electron from the GO. The Raman spectra analysis showed GO peaks blue-shifting and broadening which is attributed to hydrogen bonding interaction between GO sheets and –NO2 groups. The activation energy of nitrate ester decomposition of NC/DEGDN/GO nanocomposites increases as a function of GO content from 167 kJ mol−1 and reaches a maximum of 214 kJ mol−1 for a 0.5% w/w GO loading. This suggests an improvement of the nitrate ester bond stability. These findings open a new direction to the application of GO in nitrate ester-based materials for increased stability, safety and shelf life.

Investigation of the Effects of Polymer Dispersants on Dispersion of GO Nanosheets in Cement Composites and Relative Microstructures/Performances.

This study focused on the uniform distribution of graphene oxide (GO) nanosheets in cement composites and their effect on microstructure and performance. For this, three polymer dispersants with different level of polar groups (weak, mild, and strong) poly(acrylamide-methacrylic acid) (PAM), poly(acrylonitrile-hydroxyethyl acrylate) (PAH), and poly(allylamine-acrylamide) (PAA) were used to form intercalation composites with GO nanosheets. The results indicated that GO nanosheets can exist as individual 1–2, 2–5, and 3–8 layers in GO/PAA, GO/PAH, and GO/PAM intercalation composites, respectively. The few-layered (1–2 layers) GO can be uniformly distributed in cement composites and promote the formation of regular-shaped crystals and a compact microstructure. The compressive strengths of the blank, control, GO/PAM, GO/PAH, and GO/PAA cement composites were 55.72, 78.31, 89.75, 116.82, and 128.32 MPa, respectively. Their increase ratios relative to the blank sample were 40.54%, 61.07%, 109.66%, and 130.29%, respectively. Their corresponding flexural strengths were 7.53, 10.85, 12.35, 15.97, and 17.68 MPa, respectively, which correspond to improvements of 44.09%, 64.01%, 112.09%, and 134.79%.

Characterization of PEO/PVP/GO nanocomposite solid polymer electrolyte membranes: microstructural, thermo-mechanical, and conductivity properties

Poly (ethylene oxide) (PEO)/polyvinylpyrrolidone (PVP) blended nanocomposite polymers, incorporating graphene oxide (GO) nano-sheets and embedded with NaIO4 salt, were prepared using solution casting technique. The as-prepared nanocomposite electrolyte membranes were characterized by SEM, TEM, XRD, and Raman vibrational spectroscopic techniques to confirm the dispersion of GO nano-sheets and to understand the synergistic properties of GO/polymer interactions as a function of GO nano-sheets concentration. GO fillers incorporated electrolyte membranes demonstrated distinctive surface morphology composed of circular-shaped protuberances of different dimensions. The decrease of Raman intensity ratio (ID/IG) and in-plane crystallite size (La) values of the nanocomposites suggested the good dispersion and confinement of the GO nano-sheets. The optical properties of blend electrolyte films were studied as a function of GO filler concentration using optical absorption and diffuse reflectance spectra. In reference to PEO/PVP/NaIO4, the resultant PEO/PVP/NaIO4/GO (0.4% in weight) electrolyte membrane demonstrated both an increase in tensile strength of ca. 42% and in Young’s modulus of ca. 40%, improvements coupled with a maximum fractured elongation of 3%. Through impedance spectroscopy analysis, the role of the GO nano-sheets onto the room temperature conductivity properties of the prepared electrolyte membranes has been probed.

A general bio-inspired, novel interface engineering strategy toward strong yet tough protein based composites

Biopolymers show a broad prospect as an effective alternative to petroleum-based materials. However, assembling biopolymers into the composites with integrated high strength and toughness still remains a great challenge. Herein, we developed a novel and versatile mussel-inspired modification design for tough and high-performance graphene oxide (GO)/soy protein isolate (SPI) nanocomposite films, where the GO nanosheets were modified with poly(dopamine) (PDA) to improve the dispersion of GO nanosheets in SPI matrix and enhance their interfacial adhesion. As expected, at 0.6 wt% of PDA-modified GO (PDG) loading, the tensile strength and toughness of the SPI/PDG films reached 8.87 MPa and 22.82 MJ m−3, respectively, which simultaneously showed 86.34% and 263.95% higher than those of pristine film. The great enhancement of mechanical behaviors was due to the increased fracture line energy and the lack of significant coalescence of microcracks, as well as the strong interfacial adhesion force between peptide chains and PDG nanosheets. The resultant nanocomposite films also exhibited favorable vapor barrier behavior and water-resistance. The proposed method in this paper opens a new avenue for assembling two-dimensional nanosheets into the biopolymer-based composites with integrated high strength and great toughness for a series of innovative future applications.

Facile tailor-made enhancement in proton conductivity of sulfonated poly(ether ether ketone) by graphene oxide nanosheet for polymer electrolyte membrane fuel cell applications

Sulfonated poly(ether ether ketone) and graphene oxide nanocomposite-based polymer electrolyte membranes were prepared by facile solution casting method, and their applications for single cell were investigated. The degree of sulfonation played an important role in the proton conductivity of polymer electrolytes. Thus, we studied both the low and high degree of sulfonated poly ether ether ketones (SPEEKs) as composite with amphiphilic graphene oxide nanosheets (GNSs). The obtained results on water uptake and swelling profile showed that the physical and chemical properties of polymer electrolytes significantly improved after insertion of GNS. Morphological properties of the fabricated membranes were investigated with field emission scanning electron microscopy (FE-SEM), and the equal dispersion of GNS sheets throughout the cross section of polymer matrix was observed. The temperature-dependent conductivity reveals that SPEEK-GNS composite showed improved proton conductivity compared to pure SPEEK, because of the high degree of dispersion of GNS thus facilitated the extension of proton transport channels. Best enhancement in conductivity is observed for composite membrane containing 1.0 wt% of GNS, i.e., 149 mS cm−1.

Graphene oxide incorporated ZnO nanostructures as a powerful ultraviolet composite detector

In this study, ultraviolet (UV) photodetection performance of graphene oxide (GO) incorporated ZnO composites with different contents of GO (0.25, 0.5, 1.0, and 2.0 wt%) is investigated. The presence of graphene oxide nanosheets in the composites is confirmed by microscopic images and spectroscopic tools. Scanning electron microscopy images showed a uniform distribution of GO nanosheets between ZnO nanostructures. Uniform dispersion of GO nanosheets between ZnO nanostructures was also approved by transmission electron microscopy. Based on X-ray diffraction spectra, it was found that GO nanosheets could be considered as seeds for inhomogeneous nucleation of ZnO nanoparticles. According to Raman spectroscopy, the number layers of graphene oxide nanosheets was calculated to be around 4–6. Finally, UV-detection measurements showed that 1.0 wt% of GO into ZnO nanopowder was accounted as optimal point. However, increasing the GO concentration gave rise to a substantial reduction in the responsivity of the samples. Indeed, we believe, in the sample whose GO concentration is more than 1.0 wt%, graphene sheets play as obstacles which decrease the amount of UV light absorbed by ZnO nanostructures.

Biodegradable graphene oxide nanosheets/poly-(butylene adipate-co-terephthalate) nanocomposite film with enhanced gas and water vapor barrier properties

Poly-(butylene adipate-co-terephthalate) (PBAT) has captured significant interest by dint of its biodegradability, superb ductility, promising processing properties and good final properties, but the insufficient barrier performance limits its application, especially in packaging field. In the present work, improved barrier properties of PBAT films were obtained by introducing an extremely low amount of graphene oxide nanosheets (GONS). O2 and water vapor permeability coefficients were decreased by more than 70% and 36% at the GONS loading of 0.35 vol%, respectively. The enhanced barrier performance was ascribed to the outstanding impermeability and well dispersion of GONS as well as the strong interfacial adhesion between GONS and PBAT matrix. Furthermore, tensile strength and Young's modulus of GONS/PBAT nanocomposite rise up to 27.8 MPa and 72.2 MPa from 24.6 MPa to 58.5 MPa of neat PBAT, respectively, showing a prominent increase of mechanical properties compared to neat PBAT. The incorporation of GONS also endowed PBAT matrix with an excellent thermal stability. These findings provide a significant guidance for fabricating high barrier films on a large scale.

Incorporation of graphene oxide and silica fume into cement paste: A study of dispersion and compressive strength

As a 2D nanomaterial, graphene oxide (GO) has attracted considerable attentions for reinforcing cementitious materials. However, special attention must be paid to the dispersion of GO in the matrix, as the quality of nanomaterial dispersion correlates directly with its effectiveness for improving mechanical and other properties. In this study, the dispersion of graphene oxide (GO) in simulated pore solution and cement paste was investigated. It was found that severe GO aggregation occurred in presence of divalent calcium ions in both pore solution and cement paste. However, the GO aggregates were not stable under shear mixing. After vigorous mixing, the massive GO aggregates split into medium-sized particles, ranging from few to several 100μm. To improve the GO dispersion in cement paste, silica fume was used to mechanically separate individual GO nanosheets. The dispersion was then investigated using microstructure analysis and mechanical properties. The results showed that, with the addition of silica fume, the dispersion of GO nanosheets was greatly improved.

Morphology-controlled fabrication of a three-dimensional mesoporous poly(vinyl alcohol) monolith through the incorporation of graphene oxide

Graphene oxide (GO) is incorporated into a poly(vinyl alcohol) (PVA) monolith for the purpose of adjusting the PVA morphology and porous structure. The result is an enhanced thermal stability and water uptake ability due to the strong hydrogen bonding interactions between PVA and GO. A homogeneous dispersion of GO nanosheets in the PVA matrix is observed and contributes to the forming of such interface interactions and to the enhancement of the Brunauer–Emmett–Teller (BET) surface area at suitable GO concentrations.

Assessment of graphene oxide/epoxy nanocomposite as corrosion resistance coating on carbon steel

Graphene and its derivatives are new materials with unique properties. In recent years, various studies about the nanocomposites based on graphene oxide (GO) have been carried out. However, the electrochemical properties of nanocomposite coatings based on GO materials have not been widely studied. In this study, GO/epoxy nanocomposite coatings were prepared by incorporation of different amounts of GO nanosheets into the epoxy matrix via mechanical agitation and sonication process. The dispersion of GO nanosheets in matrix was analysed by optical microscopy, transmission electron microscopy and Fourier transform infrared. The anticorrosive properties of these nanocomposite coatings were investigated by electrochemical impedance spectroscopy tests. Results showed that the corrosion protection of coatings was improved by addition of GO into the coatings material. Furthermore, the best corrosion resistance was achieved in 0·25 wt-%GO/epoxy nanocomposite coatings.