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Abbas, Sibtain, et al. Journal of the Indian Chemical Society (2025): 101834.
Reduced graphene oxide (rGO) was utilized as a conductive scaffold for the synthesis of an Al₂S₃/rGO nanocomposite electrode designed for supercapacitor (SC) applications. The composite was fabricated via a hydrothermal method, whereby 0.2 g of rGO and 0.2 g of aluminum sulfide were dispersed in 50 mL of deionized water and stirred for 4 hours. The resulting suspension was sealed in a Teflon-lined autoclave and heated at 160 °C for 12 hours. Post-reaction, the composite was purified through ethanol and DI water centrifugation cycles, followed by drying at 70 °C for 7 hours. The final dried material was finely ground for subsequent analysis.
Physicochemical characterization confirmed the successful formation of the nanohybrid: XRD verified its crystalline structure, SEM revealed a uniform morphology, FTIR indicated the presence of key functional groups, and BET analysis demonstrated a high specific surface area. EDX further confirmed the elemental composition of the Al₂S₃/rGO material.
Electrochemical evaluation in 3.0 M KOH using a three-electrode configuration showed that the Al₂S₃/rGO nanocomposite delivered a high specific capacitance (Cs) of 1210.39 F/g and a power density of 284.35 W/kg-superior to pristine Al₂S₃ or rGO. The material also exhibited minimal internal resistance (EIS) and long-term chronoamperometric stability. This study highlights that reduced graphene oxide is used for the preparation of Al₂S₃-based nanocomposites, enabling advanced electrode materials for next-generation energy storage devices.
Ramlan, Ainni Syuhada, et al. Surfaces and Interfaces (2025): 106753.
Reduced graphene oxide (rGO) was utilized as a reinforcement material in the fabrication of polyacrylonitrile (PAN)/rGO composite coatings on silica sand (SiO₂), aimed at developing mechanically robust proppants for hydraulic fracturing. The silica sand was first functionalized with 3-glycidyloxypropyl trimethoxysilane (GPTMS) to enhance interfacial bonding. A precursor solution was prepared by separately dissolving rGO and PAN in dimethylformamide (DMF), maintaining a solvent volume ratio of 2:1 (PAN:rGO). The rGO suspension was ultrasonicated at 1 dB for 4 hours to ensure uniform dispersion, while PAN was mechanically stirred at 40 °C for 8 hours. The two solutions were then combined and stirred overnight to yield a stable coating solution.
The coated sand was subjected to post-treatment by heating at 240 °C for 4 hours to induce PAN cyclization, followed by drying at 110 °C. Molecular dynamics simulations revealed that rGO enhances interfacial adhesion, with the highest adhesion energy (784.90 kcal/mol) achieved at 1.0 wt% rGO loading. This was corroborated by mechanical testing, which showed a Young's modulus of 10.84 GPa and excellent crush resistance. Excessive rGO, however, reduced adhesion due to intermolecular interference.
This study confirms that reduced graphene oxide is used for the preparation of PAN/rGO coated sand proppants, significantly enhancing mechanical strength and interfacial adhesion through molecular-level interaction engineering.
Bashir, Khalid, et al. Diamond and Related Materials (2025): 112516.
Reduced graphene oxide (rGO) has been effectively employed for the preparation of Cu-based metal matrix composites (MMCs) using a microwave hybrid heating (MHH) approach. In this study, copper powder was reinforced with rGO at varying weight fractions (0.5%-1.5%) and melted in a 2.45 GHz domestic microwave furnace operating at 900 W. The unique processing enabled rapid and uniform thermal exposure, with reduced processing time as rGO content increased.
The fabricated composites exhibited significantly enhanced thermal and mechanical properties compared to pure copper. Vickers microhardness values rose from 61.7 HV (pure Cu) to 145.75 HV with 1.5% rGO, indicating a 2.35-fold increase. Similarly, thermal conductivity reached 450 W/m·K, 2.34 times higher than that of pure Cu. Porosity was also reduced from 1.09% in pure Cu to 0.79% in the rGO-reinforced sample.
Microstructural analysis revealed uniformly dispersed rGO within the copper matrix, promoting refined grain structures and a well-defined hexagonal solidification pattern. Techniques such as XRD and SEM confirmed the uniform reinforcement distribution and phase integrity.
This case highlights that reduced graphene oxide (rGO) is used for the preparation of Cu-based metal matrix composites, delivering significant improvements in thermal performance, hardness, and microstructural stability. These findings suggest promising applications of rGO-reinforced Cu composites in advanced thermal management and structural materials.
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