Decorated Graphene Oxide Nanocomposite Research Articles

Plasmonic Metribuzin Sensor by using synthesized CuO NPs decorated graphene oxide nanocomposite

Plasmonic Metribuzin Sensor by using synthesized CuO NPs decorated graphene oxide nanocomposite

Cellulose acetate-based electrospun nanocomposites improved by mussel-inspired polydopamine coatings and copper iodide-decorated graphene oxide: A self-disinfecting nanofibrous membrane with potential biomedical applications

Personal protective equipment and fabrics have proven their efficient use in the SARS-CoV-2 pandemic, but because germs and viruses may survive on them, they can also operate as a source of disease transmission. Self-disinfecting textiles with the potential to kill different pathogens can be used as a substitute and prevent infections. In this research, copper iodide (CuI) decorated graphene oxide nanocomposite was synthesized through a green water-based procedure, and a novel nanofibrous membrane with improved antibacterial and antiviral characteristics was prepared by a mussel-inspired method, in which polydopamine (DOPA) and CuI-decorated graphene oxide (GO-CuI) nanocomposite were coated on cellulose acetate electrospun nanofibers (CA-DOPA-GOCuI). CA-DOPA-GOCuI NFM displayed extremely good antibacterial/antiviral properties with biofilm inhibition of 50 %, and very good cell viability and proliferation even though the virus was introduced to the cell culture. Furthermore, because it accelerated the healing process, this NFM showed great promise for use as a wound dressing. This may be because it inhibits infection and has an extremely high ROS scavenging capability of 80 %. Additionally, it was shown that CA-DOPA-GOCuI NFM was non-toxic to cells and blood compatible, with cell viability that was even higher than that of the control group of untreated cells. One possible explanation for this could be the inclusion of GO, a highly biocompatible member of the graphene family, which, when combined with CuI, reduced its toxicity to normal cells. Thus, the safety of CA-DOPA-GOCuI to normal cells, favorable cell proliferation and viability, and its high toxicity to bacteria and viruses indicate its great potential to be used in a wide range of biomedical applications, specifically, self-disinfecting fabrics and wound dressings.

Highly Efficient Electrospun Silver Decorated Graphene Oxide Nanocomposites on Poly(vinylidene fluoride) (PVDF@GO-Ag) Hybrid Membrane for Reduction of 4-Nitrophenol.

Graphene oxide-silver poly(vinylidene fluoride) membranes (PVDF@GO-Ag) were successfully synthesized by the electrospinning method, which exhibited a high catalytic activity using the hydrogenation of 4-nitrophenol (4-NP) as a model reaction in a batch reaction study. The hybrid membranes doped with 1 wt% GO and 2 wt% Ag (PVDF-1-2) exhibited the most desired performance for the catalytic reduction of 4-NP. Importantly, PVDF-1-2 exhibited excellent cycling stability in 10 catalytic cycle tests and was highly amenable to separation. This property effectively addresses the significant challenges associated with the practical application of nanocatalysts. Furthermore, density-functional theory (DFT) calculations have demonstrated that the GO-Ag nanocomposites exhibit the strongest adsorption capacity for 4-NP- when a specific ratio of GO and Ag is achieved, accompanied by the loading of Ag nanoclusters onto GO. Additionally, the study demonstrated that an increase in temperature significantly accelerated the reaction rate, in line with the van't Hoff rule. This study provides an effective and environmentally friendly solution for the treatment of 4-NP in wastewater.

Ppy-decorated graphene oxide: Synthesis and analysis of surface, structural and optical properties

Here, we have syntheized Ppy (Polypyrrole) decorated GO (graphene oxide) and investigaed its morphological and optical characteristics. For fabrication of nanocomposites, in-situ polymerization technique was used. The crystalline size and strain of the synthesised sample were determined using an X-ray diffractometer (XRD). The surface morphology of the nanocomposites was investigated using field emission scanning electron microscopy (FESEM). The optical bandgap and PL spectra of the synthesised sample were examined using a photospectrometer and photoluminescence (PL) technique. The calculated crystalline size was ~ found as 5.91 nm with strain ~ 0.33907. In PL spectra, two peaks were found at ~ 430 nm and ~ 500 nm. The direct bandgap was calculated as~ 2.22 eV (visible region). Insights into their structural and optical characteristics are gained from the synthesis and characterization of PPy decorated GO nanocomposites, opening the door for further research and application in a variety of fields.

Tuning the energy storage performance of graphene oxide-based nanocomposite films by encapsulating silver nanoparticles

In the current designed study, we explore the dielectric and energy storage performance of silver nanoparticle decorated graphene oxide nanocomposites incorporated into chitosan blended with poly (1-vinylpyrrolidone-co-vinyl acetate) in comparison with only graphene oxide nanocomposite doped into the same blend matrix. A sustainable and eco-friendly green route approach was used to form the silver nanoparticle decorated graphene oxide nanocomposites. The nanocomposite films so fabricated using the solvent evaporation method, were subjected to various characterisation techniques such as X-ray diffraction analysis, Fourier transform infrared spectroscopy, thermal analysis, surface morphology and impedance spectroscopy. Slight decrease in crystallinity (44.3 %), difference in the positioning of infrared bands, thermal stability (up to ∼77 °C) and evenly distributed morphology depict the advantage of silver coating over graphene oxide nanoparticles in the blended nanocomposite films. A boost in the dielectric properties and energy storage ability was displayed by the silver encapsulated graphene oxide reinforced nanocomposite blend films. The dielectric properties were examined by using a Nyquist plot (Bulk resistance - 1.01 × 104 Ω). An ionic conductivity of 1.044 × 10−4 S/cm and a DC conductivity of 1.196 × 10‐−4 S/cm was observed. Of note, it can be inferred that silver nanoparticle decorated graphene oxide nanocomposites impart tremendous electrical properties to the chitosan/poly (1-vinylpyrrolidone-co-vinylacetate) films, enabling them to be used in energy storage applications.

Fabrication of NiSe2 decorated graphene oxide nanocomposite modified electrode as a high performance electrochemical sensor for carbamazepine

AbstractRecently, semiconductor nanomaterials have gained interest amongst researchers because of their good electrocatalytic properties. Two dimensional (2D) transition metal dichalcogenide materials, NiSe2 have good physical, chemical, and transport properties for sensing applications. The present work demonstrates the fabrication of NiSe2‐graphene oxide (NiSe2−GO) modified glassy carbon electrode for the determination of carbamazepine (CBZ). The prepared nanocomposite was characterized by XRD, SEM and FT‐IR spectral methods. CBZ exhibited an irreversible oxidation peak at 0.85 V on NiSe2−GO/GCE in phosphate buffer of pH 7.0. A 54‐fold enhancement in oxidation peak current was observed at NiSe2−GO/GCE when compared to that at bare GCE. Sensing performance of NiSe2−GO/GCE was optimized by varying peak current dependent parameters. Linear relationship between the peak current and concentration of CBZ was observed in the range of 4.50×10−8–3.22×10−5 mol L−1 for differential pulse voltammetric method and 2.32×10−8–4.79×10−5 mol L−1 for square wave voltammetric method. The practical utility of the proposed sensor, was demonstrated by determining CBZ in pharmaceutical formulations and spiked urine samples.

Calcium oxide decorated graphene oxide nanocomposite as energy storage medium: synthesis and characterization

Abstract The article presents research on the synthesis and characterization of a nanocomposite material consisting of graphene oxide (GO) decorated with calcium oxide (CaO), for the use in energy storage. The co-precipitation method was used to prepare the nanocomposite. The presence of CaO and GO in the sample was confirmed by X-ray diffraction (XRD), which revealed a crystallite size of 18 nm for CaO and 9 nm of CaO/GO. The scanning electron microscopy (SEM) images showed a well-dispersed nanocomposite structure, and energy-dispersive X-ray spectroscopy (EDX) confirmed the presence of Ca, C, and O elements in the sample. Fourier-transform infrared (FTIR) spectroscopy was used to analyze the chemical composition and structural properties of the nanocomposite. UV-visible spectroscopy revealed a direct band gap of 3.78 eV for the nanocomposite, indicating its potential application for use in electrochemical energy storage and photoconductive devices. Zeta potential measurement indicated good physical stability of the nanocomposite. These results suggest that the CaO/GO nanocomposite has promising properties for various technological applications, particularly in the field of thermal energy storage.

Photocatalytic performances of manganese oxide nanorods decorated graphene oxide nanocomposites

Photocatalytic performances of manganese oxide nanorods decorated graphene oxide nanocomposites

Stability of ZnO and Curcumin Decorated Graphene Oxide Nanocomposite in Acidic and Alkaline pH for Efficient Removal of Toxic Cd (II) Ions From Water

Stability of ZnO and Curcumin Decorated Graphene Oxide Nanocomposite in Acidic and Alkaline pH for Efficient Removal of Toxic Cd (II) Ions From Water

Design and Development of Composite Propellant Using CuFe2O4 Spinel Decorated Graphene Oxide Nanocomposite as Novel Burn Rate Modifier

AbstractThe burning rate of composite rocket propellant is a principal ballistic property that is considered while designing the rocket motor. Carbon bonded materials such as CNT(carbon nanotubes), fullerene, graphene, etc. due to their high surface area have exhibited promising results as burn rate modifiers in a propellant. Apart from enhancing the burn rate, unlike their inorganic counterparts, they are combustible and contribute towards energy output. Herein, we report a spinel structure CuFe2O4 decorated Graphene Oxide nanocomposite as novel burn rate modifier (BRM) in propellant composition. By incorporating 0.6 % of this burn rate modifier to the propellant remarkable improvement in burn rate by 61 % was observed.

Fabrication of alumina decorated graphene oxide nanocomposite for efficient removal of aqueous phosphate

Graphene-oxide/alumina (GO/Al2O3) nanocomposite was synthesized and applied for the removal of phosphate from water through adsorption. Various parameters like the influence of adsorbent dose, adsorption time, solution pH, and initial phosphate concentration on the phosphate removal capacity were examined. It was observed that the second-order kinetics model fitted better compare to the first-order kinetics. The adsorption isotherm was best fitted with Langmuir isotherm compare to Freundlich isotherm. The GO@Al2O3 nanocomposite showed maximum phosphate adsorption capacity 33.2 mg/g at pH 6 and room temperature 30 °C.The new phosphate adsorbents can be produced in a variety of structures using a simple technique and are likely to be applied to industrial applications in phosphate contaminated wastewater management.

Facile hydrothermal synthesis of Au-Mn3O4 decorated graphene oxide nanocomposites for solid-state supercapacitor

Nanocomposites of Au-Mn3O4 flowers decorated on graphene oxide have been developed through a hydrothermal technique to improve the efficiency and electrochemical behavior of transition metal oxide (TMO)-based energy materials. The mechanism for the formation of the flower morphology of the nanocomposites has been proposed with the help of time-dependent electron microscopy imaging. The surface properties and chemical composition of the nanocomposites were thoroughly investigated. The optimized nanocomposite has shown a high specific capacitance (475 F g−1) and excellent energy density (55.8 W h kg−1). The charge storage mechanism of the materials was also examined to provide an in-depth understanding of the superior electrochemical performance of the nanocomposites. In addition, the presence of graphitic carbon in the nanocomposites has resulted in better cycle stability of Au-Mn3O4//GO in an acidic electrolyte.

Synergistic photocatalytic removal of organic pollutants in the aqueous medium using TiO2–Co3O4 decorated graphene oxide nanocomposite

Synergistic photocatalytic removal of organic pollutants in the aqueous medium using TiO2–Co3O4 decorated graphene oxide nanocomposite

Enhancement of photocatalytic by Mn3O4 spinel ferrite decorated graphene oxide nanocomposites

The hydrothermal process was used to prepare Mn3O4/x%GO nanocomposites (NC’s) having different ratios of the Mn3O4 nanoparticles (NP’s) on the surface of graphene oxide (GO) sheet. SEM image showed that the Mn3O4 NP’s were distributed over the surface of GO sheet. HRTEM images exhibited the lattice fringe arising from the (101) plane of the Mn3O4 NP’s having the interplanar d-spacing of 0.49 nm decorating on the surface of GO. The electronic absorption spectra of Mn3O4/x%GO NC’s also show broad bands from 250 to 550 nm. These bands arise from the d–d crystal field transitions of the tetrahedral Mn3+ species and indicate a distortion in the crystal structure. Photo-catalytic activity of spinel ferrite Mn3O4 NP’s by themselves was low but photo-catalytic activity is enhanced when the NP’s are decorating the GO sheet. Moreover, the Mn3O4/10%GO NC’s showed the best photo-catalytic activity. This result comes from the formation of Mn–O–C bond that confirm by FT-IR. This bond would facilitate the transfer of the photoelectrons from the surfaces of the NP’s to the GO sheets. PL emission which is in the violet–red luminescent region shows the creation of defects in the fabricated Mn3O4 NP’s nanostructures. These defects create the defect states to which electrons in the VB can be excited to when the CB. The best degradation efficiency was achieved by the Mn3O4 NP’s when they were used to decorate the GO sheets in the Mn3O4/10%GO NC’s solution.HighlightsLattice fringe of Mn3O4 with an interplanar d-spacing of 0.49 nm for (101) plane.Photocatalytic activity of spinel ferrite Mn3O4 nanoparticles by itself is low.Number of photoelectrons created depends on number of Mn3O4 on a given area of GOThe bonding of the Mn3O4 to the GO sheet would be though a Mn–O–C junction.The degradation processes were accelerated by Mn3O4/10%GO nanocompositesGraphic abstract

Sulphur nanodots decorated graphene oxide nanocomposite for electrochemical determination of norepinephrine in presence and absence of 4-aminophenol, acetaminophen and tryptophan

Abstract The work reports the use of sulphur nanodots grown on graphene oxide (nS@GO) for detection of norepinephrine in presence and absence of 4-aminophenol, acetaminophen and tryptophan. The nS@GO was synthesized by one-pot method using CS2 as sulphur source using dimethylformamide (DMF) as solvent. The synthesized nanocomposite material was used for sensor application by drop-casting nS@GO (dispersed in DMF) over glassy carbon electrode. The formation of nanocomposite was confirmed using several physical characterization techniques i.e. XRD technique, Raman spectroscopy, SEM and TEM and electrochemically using cyclic voltammetry and electrochemical impedance spectroscopy. Differential pulse anodic stripping voltammetry technique was applied for quantitative determination of norepinephrine in presence and absence of 4-aminophenol, acetaminophen and tryptophan. Electrochemical impedance spectroscopy and chronoamperometry were also employed for quantitative analysis of norepinephrine. The electrochemical studies results reveal that the nS@GO based electrochemical sensor exhibits a linear response for norepinephrine in range of 0.5 to 800 μM (in absence) and 0.5–110 μM (in presence of other analytes) with sensitivities 4.986 μAμM−1cm−2 and 0.407 μAμM−1cm−2 their respective detection limit were found to be 0.26 and 0.26 μM. The nanocomposite modified electrode response was also effectively tested in real samples without any cross reactivity.

Tungsten oxide decorated graphene oxide nanocomposite: Chemical synthesis, characterization and application in super capacitors

Nano structured metal oxides received considerable research attention due to their unique properties that can be used for designing advanced nanodevices. Thus, in the present study, Tungsten oxide/graphene oxide (WO3/GO) nanocomposite was synthesized, characterized and implemented in an electrochemical system. Graphene oxide was synthesized by Hummer’s method. WO3 doped Graphene oxide nanocomposite were also successfully synthesized using sodium tungstate as the source of Tungsten. The crystalline structure and optical properties of WO3 doped GO nanocomposite were characterized by UV–VIS spectroscopy, IR spectroscopy, X-ray diffraction (XRD) studies, Field Emission Scanning Electron Microscope (FESEM) with EDAX spectroscopy. The XRD spectrum showed diffraction peaks corresponding to the crystal planes of crystalline Tungsten oxide. Using Debye scherrer formula, the size of the undoped and Tungsten oxide doped Graphene oxide nanocomposite were also calculated. The morphological studies of the nanocomposite revealed crystal like morphology. The energy dispersive analysis confirmed the presence of Carbon, Tungsten and oxygen in the doped WO3/GO lattice. Cyclic voltammetric behaviour showed better electrochemical response with the doped sample when compared with the undoped sample.

Silver nanoparticles decorated graphene oxide nanocomposite for bone regeneration applications

Different ultra-lightweight carbon nanostructures with superb mechanical properties have made them attractive materials for reinforcing nanocomposites. However, the preparation of an ideal bone reinforcement is still a challenging task. Therefore, in the present study, a simple wet chemistry method was employed to synthesize silver nanoparticles (AgNPs) decorated graphene oxide (GO) nanocomposite as potential reinforcement in orthopedic applications. A well-dispersed nearly oval-shaped AgNPs with the mean size of 9 ± 6 nm were homogeneously formed on the surface of GO due to its supporting role in preventing agglomeration of fine particles. The results of the antibacterial activities revealed that the anchor of AgNPs on the surface of GO improved its antibacterial properties, in which the composite structure exhibited higher antibacterial activity against Escherichia coli (E. coli) than Staphylococcus aureus (S. aureus) bacteria. The proposed protocol can keep steady the scattering of the AgNPs in nanocomposite and prolong the antibacterial activity of the system. Highlights AgNPs-GO nanocomposite was prepared via a facile wet chemistry approach. AgNPs (9 ± 6 nm) were homogeneously formed on GO. GO dictated the formation of nearly oval AgNPs in the system. The highest reactivity was found to be -0.315 eV.atom−1. Nanocomposite showed higher antibacterial activity versus E. coli than S. aureus bacteria.

Enhanced electrocatalytic activity towards urea oxidation on Ni nanoparticle decorated graphene oxide nanocomposite

Hydrogen production from natural resourses and industrial waste water is of vital and duel importance to the energy and environmental issues. Urea oxidation based on cost effictive catalyst and which is substuation to the noble based electrolysers like Pt, Pd and Rh of great challange. Herein, we have fabricated effective decoration of Ni NPs on GO by chemical reduction approach and characterized by Furrier transfarm infra red (FTIR) spectroscopy, X-ray diffraction (XRD), transmissio electron microscopy (TEM), Raman spectroscopy, BET surface area measurements and X-ray photoelectron spectroscopy (XPS). In the morphological studies TEM confirms the Ni NPs (∼10 nm) on GO (∼20 nm thickness) and XRD confirms its FCC crystal structure. Further, Raman spectroscopic analysis showed the increment of ID/IG ratio more than double in GO compared to Ni@GO supports decoration of Ni NPs on GO. BET analysis also supports Ni@GO having higher surface area compared to Ni NPs and GO individuals, More significantly, binding energy of Ni is zero-valent confirmed from XPS of Ni@GO. Electrochemical activity of Ni@GO from cyclic voltammetry (CV) shows the ultrahigh current density is of 27 mA/cm2 at an ultralow onset potential of 0.30 V vs SCE having long term stability. Electrochemical impedance spectroscopy (EIS) shows the highly sensitive towards the urea oxidation reaction on Ni@GO nanocomposite. The electrocatalytic activity on Ni@GO is pH sensitive towards urea oxidation.

The electrochemical determination of hazardous 4-hydroxynitrobenzene using NiS2 decorated graphene oxide nanocomposite in the river water sample

The preparation, characterization, and electrochemical sensing potential of nickel disulphide (NiS2) based nanocomposite material is described. The nanocomposite was synthesized by a hydrothermal procedure and subsequently characterized by electron microscopy, X-ray diffraction (XRD) and XPS. The investigation of electrocatalytic activity of NiS2 based nanocomposites was performed for the reduction of 4-hydroxynitrobenzene (4-HNB) via cyclic voltammetry. The experimental parameters such as the effect of scan rate and pH have been optimized for the electrochemical detection of 4-HNB. The linear relationship between the peak current and the concentration of 4-HNB was found to be in the range of 0.1000–1053 µM with an impressive detection limit of 59.5 nM. The performance of NiS2 based nanocomposites modified working electrode towards 4-HNB detection shows good stability, reproducibility with the recovery percentage of 99.3%. The results clearly depict the sensing performance and potential application of NiS2 based nanocomposites for the electrochemical detection of 4-HNB for the real-world analysis.

Facile sonochemical synthesis of rutile-type titanium dioxide microspheres decorated graphene oxide composite for efficient electrochemical sensor.

In this reports the facile and green synthesis of rutile-type titanium dioxide nanoparticles decorated graphene oxide nanocomposite via the ultrasonication process (frequency: 50kHz, Power: 100W/cm2 and Ultrasonic type: Ti-horn). Because, the sonochemical synthesis method is simple, non-explosive and harmless method than other conventional technique. Furthermore, the synthesized material was characterized by various analytical techniques including FESEM, EDX, XRD, EIS and electrochemical methods. Then, the synthesized TiO2 MPs@GOS composite was applied for the electrocatalytic detection of theophylline (TPL) using CV and amperometric (current-time) techniques. Captivatingly, the modified sensor has excellent electrocatalytic performance with the wider linear range from 0.02 to 209.6µM towards the determination of theophylline and the LOD and sensitivity of the modified sensor was calculated as 13.26nM and 1.183μA·µM-1·cm-2, respectively. In addition, a selectivity, reproducibility and stability of the TiO2 MPs@GOS modified GCE were analyzed towards the determination of theophylline molecule. Finally, the real time application of TiO2 MPs@GOS modified theophylline sensor was established in serum and drug samples.