Insight into the effect of graphite grain sizes on the morphology, structure and electrical properties of reduced graphene oxide

Sieradzka, Marta; Ślusarczyk, Czesław; Fryczkowski, Ryszard; Janicki, J.

doi:10.1016/j.jmrt.2020.05.026

Cited by 32 publications

(18 citation statements)

References 41 publications

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“…What is important, however, is that despite such significant structural changes, the rGO3 sample was the least defected one, as evidenced by the results of Raman spectroscopy. Our previous research shows that the fewer defects present in the rGO structure, the better its electrical properties [46]. Moreover, Method 3 has a simplified procedure: Short mixing time, without sonication and NaNO3, which is important from an industrial point of view.…”

Section: Discussionmentioning

confidence: 99%

“…Following the exfoliation, the number of layers in the obtained graphene oxides, compared to graphite, was significantly reduced, as calculated from the following relationship D 001 d 001 + 1 [46]. Data in Table 3 show that the oxidation reaction, regardless of the conditions, resulted in an approximately five-fold reduction in layers compared to the original graphite.…”

Section: Sample 2θ (mentioning

confidence: 98%

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The Role of the Oxidation and Reduction Parameters on the Properties of the Reduced Graphene Oxide

et al. 2021

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One of the methods of obtaining reduced graphene oxide (rGO) involves the oxidation of graphite to graphene oxide, which is then exfoliated and reduced. Each of these stages has a decisive influence on the properties of the produced nanoadditive, which determines its subsequent application. The process conditions which are examined during the oxidation stage are related to: The mixing time of the reactants before oxidation, sonication of the reaction mixture, and its composition. During reduction optimization, in turn, the form of the GO sample and the method of its purification, as well as the temperature at which this process took place, are examined. At each stage, the determined structural parameters of the produced materials (GO and rGO) are related to their morphology (SEM—scanning electron microscope), oxidation state (FTIR—Fourier transform infrared spectroscopy, EDS—energy-dispersive spectrometer), structure defect (Raman spectroscopy), as well as the number of layers and crystalline structure (WAXS—wide-angle X-ray scattering). The obtained results show that the shorter mixing time of the reactants determines the formation of more oxygen functional groups. On the basis of the obtained results, the process conditions that enable the production of multilayer, well-exfoliated reduced graphene oxide, with only a slightly defected structure, are established.

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Section: Discussionmentioning

confidence: 99%

Section: Sample 2θ (mentioning

confidence: 98%

The Role of the Oxidation and Reduction Parameters on the Properties of the Reduced Graphene Oxide

et al. 2021

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“…Based on the WAXS analysis, the interlayer distance and average number of sheets were determined, which were 0.37 nm and 6, respectively. The elemental composition of the obtained reduced graphene oxide was determined by EDS analysis and was 81.4 at.% C, 18.6 at.% O [ 50 ]. The detailed characteristics of rGO can be found in the Supplementary Materials (Figure S1) .…”

Section: Methodsmentioning

confidence: 99%

“…The process of graphite oxidation proceeded according to the following procedure [ 50 ]: 30 g of graphite was added into a beaker with 750 cm 3 sulfuric acid (VI). The mixture was stirred for 1 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

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Supermolecular Structure of Poly(Butylene Terephthalate) Fibers Formed with the Addition of Reduced Graphene Oxide

et al. 2020

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Nanocomposite fibers based on poly(butylene terephthalate) (PBT) and reduced graphene oxide (rGO) were prepared using a method able to disperse graphene in one step into a polymer matrix. The studies were performed for fibers containing four different concentrations of rGO at different take-up velocities. The supermolecular structures of the fibers at the crystallographic and lamellar levels were examined by means of calorimetric and X-ray scattering methods (DSC, WAXS, and SAXS). It was found that the fiber structure is mainly influenced by the take-up velocity. Fibers spun at low and medium take-up velocities contained a crystalline α-form, whereas the fibers spun at a high take-up velocity contained a smectic mesophase. During annealing, the smectic phase transformed into its α-form. The degree of transformation depended on the rGO content. Reduced graphene mainly hindered the crystallization of PBT by introducing steric obstacles confining the ordering of the macromolecules of PBT.

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Reduced Graphene Oxide‐based Sensor for 17α‐Ehinylestradiol Voltammetric Determination in Wastewater, Tablets and Synthetic Urine Samples

et al. 2022

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The following study reports the development of modified electrode with reduced graphene oxide (ErGO) for the voltammetric determination of 17α‐ethinylestradiol (EE2). The structural and morphological characterizations of the rGO were carried out by FTIR, Raman, UV‐Vis, TEM and SEM, and showed the typical formation of the nanomaterial. Electrochemical analyses were performed using Differential Pulse Voltammetry (DPV). Under optimized conditions, an analytical curve was generated for the sensor, which presented a linear dynamic range (LDR) from 0.04 to 8.28 μmol L−1 (R2=0.9999), with limit of detection (LOD) of 6.79 nmol L−1 and limit of quantification (LOQ) of 22.60 nmol L−1. The reproducibility and repeatability studies showed relative standard deviations (RSD) of 2.31 % and 5.23 %, respectively. ErGO was used to determine EE2 in wastewater, tablets, and synthetic urine samples with recovery values between 94.8 % and 110.1 %. The results obtained with ErGO show that the developed sensor can be used for the identification and quantification of EE2 in several matrices, due the excellent analytical performance presented.

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Insight into the effect of graphite grain sizes on the morphology, structure and electrical properties of reduced graphene oxide

Cited by 32 publications

References 41 publications

The Role of the Oxidation and Reduction Parameters on the Properties of the Reduced Graphene Oxide

The Role of the Oxidation and Reduction Parameters on the Properties of the Reduced Graphene Oxide

Supermolecular Structure of Poly(Butylene Terephthalate) Fibers Formed with the Addition of Reduced Graphene Oxide

Reduced Graphene Oxide‐based Sensor for 17α‐Ehinylestradiol Voltammetric Determination in Wastewater, Tablets and Synthetic Urine Samples

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