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Сорокина, Н. Е.; Максимова, Н. В.; Авдеев, В. В.

doi:10.1023/a:1017575710886

Cited by 50 publications

(14 citation statements)

References 11 publications

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“…The next intercalation, after expanding the graphene layers, occurs on basal planes. Simultaneously, nitric acid is generated in the sulfuric acid medium and intercalates into the graphite structure (Figure S1), yielding defective black graphene layers [25]. The defective sites are also attacked by acids, which intercalate them.…”

Section: Resultsmentioning

confidence: 99%

Structural Characterization of Graphene Oxide: Surface Functional Groups and Fractionated Oxidative Debris

et al. 2019

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The purpose of this work is the structural analysis of graphene oxide (GO) and by means of a new structural model to answer the questions arising from the Lerf–Klinowski and the Lee structural models. Surface functional groups of GO layers and the oxidative debris (OD) stacked on them were investigated after OD was extracted. Analysis was performed successfully using Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), X-ray photoemission spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy (SSNMR), standardized Boehm potentiometric titration analysis, elemental analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The analysis showed that graphene oxide layers, as well as oxidative debris contain different functional groups such as phenolic –OH, ketone, lactone, carboxyl, quinone and epoxy. Based on these results, a new structural model for GO layers is proposed, which covers all spectroscopic data and explains the presence of the other oxygen functionalities besides carboxyl, phenolic –OH and epoxy groups.

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Section: Resultsmentioning

confidence: 99%

Structural Characterization of Graphene Oxide: Surface Functional Groups and Fractionated Oxidative Debris

et al. 2019

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“…In reality, however, when BO exceeded 30.4%, the amorphous fraction started to increase, while the crystalline fraction decreased accordingly. Sorokina et al [38] reported that, when anodized with 98% HNO 3 for 24 h, natural flaked graphite became amorphous as overoxidation occurred. They concluded that the overoxidation process caused the graphite structure to decompose.…”

Section: Changes In Structural Parameters Resulting From Activation Processmentioning

confidence: 99%

Analysis of Activation Process of Carbon Black Based on Structural Parameters Obtained by XRD Analysis

2021

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In the present study, carbon black activated by CO2 gas was examined through XRD analysis, especially with regard to changes in its structural parameters. Based on the results, its activation process was thoroughly analyzed. The activation process was controlled by isothermally activating the carbon black inside a reaction tube through which CO2 gas flowed. With this approach, the degree of activation was varied as desired. At an early stage of the activation process, the amorphous fraction on the carbon black surface was preferentially activated, and later the less-developed crystalline carbon (LDCC) region inside the carbon black particles started to be activated. The latter process was attributable to the formation of pores inside the carbon black particles. As the activation process proceeded further, the more-developed crystalline carbon (MDCC) region started to be activated, thereby causing the pores inside the carbon black particles to grow larger. At the last stage of the activation process, La was found to be decreased to about 40 Å. This implied that the edges of the graphite crystals had been activated, thus causing the internal pores to grow and coalesce into larger pores. Activated conductive Super-P with enhanced pore properties is expected to have wide applications.

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“…In general, the chemical treatment of graphite in strong oxidation medium breaks down the diffraction peak, (002) at 26.5 and generates new peak at 10-12 , which caused by the thorough exfoliation of the closely stacked graphite layers. 29 Differently from these results, the small shift of (002) peak instead of disappearance suggests that the exfoliation of stacked graphite layers was not sufficient. By the further treatment of the oxidized graphites with PDDA, the characteristic diffraction peak, (002) was not shifted, but (004) peak was very weak.…”

Section: Resultsmentioning

confidence: 66%

Preparation and Characterization of Gold-Decorated Graphite Nanosheet Composites

Kim

Nam²,

Oh³

2013

j nanosci nanotechnol

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Some composites of gold nanoparticles and graphite nanosheets were prepared by electrostatic interaction, and structurally and electrochemically characterized using X-ray diffraction, X-ray photoelectron spectroscopy, UVNis spectroscopy, transmission electron microscopy, and cyclic-voltammetry. Pristine graphite was chemically treated using aqueous acid solution, and dispersed inpoly(diallyldimethylammonium) chloride aqueous solution to prepare positively charged graphite nanosheets. The gold nanoparticles (GNPs) in this work were stabilized by sodium dodecyl sulfate, poly(sodium 4-styrene sulfonate), or poly(vinylpyrrolidone). Gold nanoparticles and graphite nanosheet composites with gold nanoparticles showed the characteristic surface plasmon band at -530 nm. The electrochemical properties of the graphite nanosheet composites with gold nanoparticles were studied by cyclic voltammetry, in which reduction potential and reduction current of gold nanoparticles were strongly dependent on the gold-wrapped stabilizer in the composites.

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Cited by 50 publications

References 11 publications

Structural Characterization of Graphene Oxide: Surface Functional Groups and Fractionated Oxidative Debris

Structural Characterization of Graphene Oxide: Surface Functional Groups and Fractionated Oxidative Debris

Analysis of Activation Process of Carbon Black Based on Structural Parameters Obtained by XRD Analysis

Preparation and Characterization of Gold-Decorated Graphite Nanosheet Composites

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