Structural Evolution of Graphene Oxide and Its Thermal Stability During High Temperature Sintering

Hu, Lanxin; Wang, Aiyang; Wang, Weimin

doi:10.1007/s11595-022-2537-8

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…After being annealed at 1000 °C for 30 s, distinct characteristic peaks appeared at 1341 cm −1 and 1600 cm −1 , indicating that high-temperature thermal reduction could transform GO into rGO [ 38 ]. In the study by Hu et al [ 39 ], it was observed that GO could gradually decompose at 800 °C, reducing the oxygen functional groups on the surface and resulting in the formation of rGO. Therefore, it could be concluded that in this study, rGO-Cement powder was synthesized in situ through a high-temperature thermal reduction process.…”

Section: Resultsmentioning

confidence: 99%

In Situ Preparation of rGO-Cement Using Thermal Reduction Method and Performance Study

Yao,

Guan,

Ruan

et al. 2024

Materials

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In this study, the combination of freeze-drying and high-temperature thermal reduction methods was employed to in situ prepare reduced graphene oxide (rGO)-Cement based on graphene oxide (GO)-Cement. The electrical conductivity and mechanical properties of the rGO-Cement were investigated. Microscopic analysis methods such as Raman spectra, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were used to confirm the successful transformation of GO-Cement to rGO-Cement. The research results demonstrated that with an increase in rGO content, the electrical resistivity of the rGO-Cement decreased first and then increased, reaching a percolation threshold at the dosage of 0.7 wt.%. The compressive strength and flexural strength of the rGO-Cement increased first and then decreased. The optimal dosage of rGO was 0.7%. The in situ preparation of rGO-Cement using the thermal reduction method holds a great potential for various applications, providing new ideas and methods for the modification and enhancement of cement materials.

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Section: Resultsmentioning

confidence: 99%

In Situ Preparation of rGO-Cement Using Thermal Reduction Method and Performance Study

Yao,

Guan,

Ruan

et al. 2024

Materials

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“…For this reason, we used a non-stoichiometric mixture with an excess of nickel oxide to form two phase ceramics. However, prior to direct tests of catalytic activity, studies on the effects of the synthesis conditions and aging temperature material are essential [28]. Despite the interest in nickel aluminate, to the best of our knowledge, very few studies explored the effects of physical thermal treatment on the crystal structure peculiarities of NiAl 2 O 4 ceramics.…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of synthesis temperature and thermal aging on structural, dielectric properties and phase composition in NiO/NiAl₂O₄ composite ceramics

Shakirzyanov,

Borgekov,

Garanin

et al. 2024

Mater. Res. Express

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In modern materials science, a considerable amount of research is focused on obtaining new ceramic materials to create efficient functional elements. Acquiring highly efficient and highly stable ceramic catalysts for alternative energy is an important task that demands an urgent solution. Addressing this issue promptly is essential as it will facilitate the development of new technologies that can prevent future energy crises. Nickel oxide NiO or spinels of NiAl2O4 composition are excellent candidates as high temperature catalysts used in alternative energy applications. This paper studies the synthesis of NiO/NiAl2O4 composite ceramics and the effect of high-temperature aging on their phase composition, crystalline properties, and dielectric characteristics. The study found that the phase composition and microstructure of the ceramics are unchanged by thermal aging (aged at 700 °C), while the crystalline parameters and low-frequency dielectric characteristics may undergo significant changes over time, exhibiting notable fluctuations depending on the duration of aging. The observed variations were predominantly influenced by the microstructural features of the composite ceramics. As the average grain size increased and the phase transformations were completed, the crystalline parameters and low-frequency dielectric characteristics reached a stable state without further alteration. For NiO/NiAl2O4 ceramics with a sintering temperature of 1500 °C, the highest shrinkage, low dielectric loss values and acceptable hardness were observed, indicating that the fabricated ceramics are suitable for mechanical processing. In general, the obtained composite ceramics show high temperature stability and are ready for use in hydrogen energy applications as functional elements.

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“…Contrary to monolayer graphene, showing good thermal stability at temperatures lower than 500 • C (<600 • C temperatures for bilayer graphene) [21], it is well known that GO exhibits lower thermal stability due to the presence of oxygen functional groups with defective basal plane structures (carboxyl and lactol groups) [22,23]. According to C. Li et al, graphene oxide may begin to decompose at approximately 70 • C [24].…”

Section: Introductionmentioning

confidence: 99%

Decoration of Reduced Graphene Oxide with Magnesium Oxide during Reflux Reaction and Assessment of Its Antioxidant Properties

Bensouici

Baali

Bouloudenine

et al. 2022

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The aim of this work is the reduction and decoration of graphene oxide (GO) with magnesium oxide (MgO). In this work, GO was synthesized using modified Hummers’ protocol with (1:2), (1:3) and (1:4) graphite:potassium permanganate mass ratios. Subsequently, all GO samples (GO1:2, GO1:3, GO1:4) were reduced and decorated with magnesium oxide nanoparticles using a reflux technique at 100 °C for 2 h. Sample characterization using X-ray diffraction (XRD) reveals the presence of peaks relative to two different magnesium (Mg) phases: magnesium oxide (MgO) and magnesium hydroxide (Mg(OH)2). The presence of these spectral features, although characterized by a remarkable broadening, confirms the successful synthesis of Mg(OH)2-rGO-MgO nanocomposites. X-ray photoelectron spectroscopy (XPS) spectra indicate the presence of peaks assigned to C, O and Mg. The analysis of the high-resolution XPS spectra of these elements confirms once again the presence of Mg(OH)2-rGO-MgO compounds. The low temperature synthesis of Mg(OH)2-rGO-MgO nanocomposite exhibiting superior catalytic properties compared to MgO–rGO nanoparticles is an important step forward with respect to the current state of the art. The antioxidant activity of six nanocomposites, namely GO1:2, GO1:3, GO1:4, MgO–rGO1:2, MgO–rGO1:3 and MgO–rGO1:4, was determined using standard protocols based on a DPPH radicals scavenging assay, an H2O2 scavenging assay, and a phosphomolybdate assay. All our samples exhibited dose-dependent antioxidant activity. Interestingly, among the different synthesized nanoparticles, GO1:4 and MgO–rGO1:4 showed the best performances.

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Structural Evolution of Graphene Oxide and Its Thermal Stability During High Temperature Sintering

Cited by 7 publications

References 24 publications

In Situ Preparation of rGO-Cement Using Thermal Reduction Method and Performance Study

In Situ Preparation of rGO-Cement Using Thermal Reduction Method and Performance Study

Study of the effect of synthesis temperature and thermal aging on structural, dielectric properties and phase composition in NiO/NiAl₂O₄ composite ceramics

Decoration of Reduced Graphene Oxide with Magnesium Oxide during Reflux Reaction and Assessment of Its Antioxidant Properties

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Structural Evolution of Graphene Oxide and Its Thermal Stability During High Temperature Sintering

Cited by 7 publications

References 24 publications

In Situ Preparation of rGO-Cement Using Thermal Reduction Method and Performance Study

In Situ Preparation of rGO-Cement Using Thermal Reduction Method and Performance Study

Study of the effect of synthesis temperature and thermal aging on structural, dielectric properties and phase composition in NiO/NiAl2O4 composite ceramics

Decoration of Reduced Graphene Oxide with Magnesium Oxide during Reflux Reaction and Assessment of Its Antioxidant Properties

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Study of the effect of synthesis temperature and thermal aging on structural, dielectric properties and phase composition in NiO/NiAl₂O₄ composite ceramics