Simple Synthesis of Large Graphene Oxide Sheets via Electrochemical Method Coupled with Oxidation Process

Kumar, Navneet; Srivastava, Vimal Chandra

doi:10.1021/acsomega.8b01283

Cited by 151 publications

(71 citation statements)

References 61 publications

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“…From the obtained extracts, 5 mL was titrated with 0.05 M HCl solution using phenolphthalein as an indicator. For proper interpretation of the results, blank samples were also performed without GO, having the same concentrations [56,57].…”

Section: Methodsmentioning

confidence: 99%

Multifunctional Platforms Based on Graphene Oxide and Natural Products

et al. 2019

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Background and objectives: In the last few years, graphene oxide has attracted much attention in biomedical applications due to its unique physico-chemical properties and can be used as a carrier for both hydrophilic and/or hydrophobic biomolecules. The purpose of this paper was to synthesize graphene oxide and to obtain multifunctional platforms based on graphene oxide as a nanocarrier loaded with few biologically active substances with anticancer, antimicrobial or anti-inflammatory properties such as gallic acid, caffeic acid, limonene and nutmeg and cembra pine essential oils. Materials and Methods: Graphene oxide was obtained according to the method developed by Hummers and further loaded with biologically active agents. The obtained platforms were characterized using FTIR, HPLC, TGA, SEM, TEM and Raman spectroscopy. Results: Gallic acid released 80% within 10 days but all the other biologically active agents did not release because their affinity for the graphene oxide support was higher than that of the phosphate buffer solution. SEM characterization showed the formation of nanosheets and a slight increase in the degree of agglomeration of the particles. The ratio I2D/IG for all samples was between 0.18 for GO-cembra pine and 0.27 for GO-limonene, indicating that the GO materials were in the form of multilayers. The individual GO sheets were found to have less than 20 µm, the thickness of GO was estimated to be ~4 nm and an interlayer spacing of about 2.12 Å. Raman spectroscopy indicated that the bioactive substances were adsorbed on the surface and no degradation occurred during loading. Conclusions: These findings encourage this research to further explore, both in vitro and in vivo, the biological activities of bioactive agents for their use in medicine.

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Section: Methodsmentioning

confidence: 99%

Multifunctional Platforms Based on Graphene Oxide and Natural Products

et al. 2019

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“…However, some residual oxygen-containing species remain in the material. In fact, the appearance of the new peak at 1550 cm −1 indicates the C=C vibrations attributed to the aromatic carbon rings [ 38 ]. This can support the hypothesis that during thermal reduction, the partial restoration of the π-conjugated sp 2 structure should enhance the electrical conductivity of rGO [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide and Polyaniline Nanofibers Nanocomposite for the Development of an Amperometric Glucose Biosensor

Popov

Aukštakojytė

Gaidukevič

et al. 2021

Sensors

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The control of glucose concentration is a crucial factor in clinical diagnosis and the food industry. Electrochemical biosensors based on reduced graphene oxide (rGO) and conducting polymers have a high potential for practical application. A novel thermal reduction protocol of graphene oxide (GO) in the presence of malonic acid was applied for the synthesis of rGO. The rGO was characterized by scanning electron microscopy, X-ray diffraction analysis, Fourier-transform infrared spectroscopy, and Raman spectroscopy. rGO in combination with polyaniline (PANI), Nafion, and glucose oxidase (GOx) was used to develop an amperometric glucose biosensor. A graphite rod (GR) electrode premodified with a dispersion of PANI nanostructures and rGO, Nafion, and GOx was proposed as the working electrode of the biosensor. The optimal ratio of PANI and rGO in the dispersion used as a matrix for GOx immobilization was equal to 1:10. The developed glucose biosensor was characterized by a wide linear range (from 0.5 to 50 mM), low limit of detection (0.089 mM), good selectivity, reproducibility, and stability. Therefore, the developed biosensor is suitable for glucose determination in human serum. The PANI nanostructure and rGO dispersion is a promising material for the construction of electrochemical glucose biosensors.

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“…The absorption peaks located at 3541–3367 cm −1 can be ascribed to O–H group stretching vibration, while the peaks between 2907 and 2232 cm −1 correspond to the asymmetric and symmetric stretching vibrations of C–H [ 28 , 29 ]. The bands observed at 1726 cm −1 , 1615 cm −1 , and 1416 cm −1 are attributed to C=O, C=C, and C–O–C stretching vibrations, respectively [ 30 ]. Additionally, the band located at 1222 cm −1 can be ascribed to C–OH stretching vibrations [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

et al. 2020

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In this work, the effects of graphene oxide (GO) concentrations (1.5 wt.%, 2.5 wt.%, and 5 wt.%) on the structural, morphological, optical, and luminescence properties of zinc oxide nanorods (ZnO NRs)/GO nanocomposites, synthesized by a facile hydrothermal process, were investigated. X-ray diffraction (XRD) patterns of NRs revealed the hexagonal wurtzite structure for all composites with an average coherence length of about 40–60 nm. A scanning electron microscopy (SEM) study confirmed the presence of transparent and wrinkled, dense GO nanosheets among flower-like ZnO nanorods, depending on the GO amounts used in preparation. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption spectroscopy, and photoluminescence (PL) measurements revealed the impact of GO concentration on the optical and luminescence properties of ZnO NRs/GO nanocomposites. The energy band gap of the ZnO nanorods was independent of GO concentration. Photoluminescence spectra of nanocomposites showed a significant decrease in the intensities in the visible light range and red shifted suggesting a charge transfer process. The nanocomposites’ chromaticity coordinates for CIE 1931 color space were estimated to be (0.33, 0.34), close to pure white ones. The obtained results highlight the possibility of using these nanocomposites to achieve good performance and suitability for optoelectronic applications.

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Simple Synthesis of Large Graphene Oxide Sheets via Electrochemical Method Coupled with Oxidation Process

Cited by 151 publications

References 61 publications

Multifunctional Platforms Based on Graphene Oxide and Natural Products

Multifunctional Platforms Based on Graphene Oxide and Natural Products

Reduced Graphene Oxide and Polyaniline Nanofibers Nanocomposite for the Development of an Amperometric Glucose Biosensor

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

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