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Thi, Hong Phuong Nguyen, et al. Nano-Structures & Nano-Objects 29 (2022): 100810.
Graphene nanoplatelets (GNPs) have been successfully utilized as a support matrix for the green synthesis of silver nanoparticle/graphene nanocomposites, demonstrating their pivotal role in sustainable nanomaterial development. In a recent study, GNPs were dispersed in aqueous AgNO₃ solutions at varying Ag⁺ concentrations and subjected to ultrasonic stirring. The leaf extract of Cleistocalyx operculatus served as an eco-friendly reducing agent, initiating the in-situ formation of Ag nanoparticles on the graphene surface under ambient conditions.
The green synthesis protocol allowed for precise control over the graphene-to-silver ratio, enabling the fabrication of nanocomposites with tunable silver loading (30-100%). Following extract addition, the reaction mixture was centrifuged, thoroughly washed with ethanol and water, and dried at 60 °C. The resulting GNP-supported silver nanocomposites exhibited potential for enhanced functionality due to the synergistic effects of graphene's high surface area and the antimicrobial or catalytic properties of silver nanoparticles.
Notably, this study highlights the dual function of graphene nanoplatelets as both a physical scaffold and a facilitator for uniform nanoparticle deposition in green synthesis routes. Compared to silver nanoparticles synthesized without graphene, the nanocomposites likely display improved dispersion stability and functional performance, underscoring the value of GNPs in the design of hybrid nanomaterials for environmentally conscious applications.
Tahalyani, Jitendra, M. Jaleel Akhtar, and Kamal K. Kar. Materials Today Communications 33 (2022): 104586.
Graphene nanoplatelets (GNPs) have demonstrated exceptional promise as conductive fillers in polymer matrices for electromagnetic interference (EMI) shielding applications. In a recent study, GNPs were synthesized via microwave intercalation followed by water-bath sonication, producing high-aspect-ratio, exfoliated graphene structures suitable for dispersion in polymer systems.
The prepared GNPs were incorporated into a polyurethane (PU) matrix at varying loadings (2, 4, 6, and 8 wt%) using a solution casting technique. The GNPs were first sonicated in acetone to ensure effective dispersion, then gradually blended into a pre-prepared PU solution. The composite solution underwent extended magnetic stirring and sonication to ensure homogeneity and removal of air bubbles. After casting into molds and drying at ambient conditions, flexible and conductive GNP/PU nanocomposites were obtained.
The incorporation of GNPs into the PU matrix led to the formation of a continuous conductive network that significantly enhanced the EMI shielding effectiveness of the composites. This improvement is attributed to the high electrical conductivity and large surface area of graphene nanoplatelets, which facilitate reflection and absorption of EM waves.
This study underscores the utility of graphene nanoplatelets in developing lightweight, flexible, and effective EMI shielding materials, particularly relevant for modern electronics, telecommunication devices, and wearable technologies where interference mitigation is crucial.
Akhtar, Maria, et al. Journal of Magnetism and Magnetic Materials 595 (2024): 171831.
Graphene nanoplatelets (GNPs) were employed as functional additives in the synthesis of Li₀.₂Mg₀.₆Fe₂.₁₇Dy₀.₀₃O₄/Graphene nanoplatelet (LMFD/GNP) magnetic nanocomposites using a cost-effective sol-gel auto combustion (SGAC) process. This method facilitated the formation of advanced nanostructured materials with tailored magneto-dielectric properties suitable for high-frequency applications, transformer cores, and biomedical hyperthermia.
Various GNP concentrations (0-5 wt%) were integrated into the precursor matrix comprising high-purity nitrate salts of Li, Mg, Fe, and Dy, with citric acid serving as the fuel. The mixture was sonicated and pH-adjusted before being gelled and subjected to controlled drying and calcination at 800 °C. The incorporation of GNPs improved the magnetic parameters, notably enhancing saturation magnetization, coercivity, and microwave operational frequency-attributes critical for electromagnetic and spintronic devices.
GNPs provided a high-surface-area conductive network that promoted crystallite growth and influenced the composite's microstructure and dielectric response. Their presence contributed to better magnetic ordering and reduced dielectric loss, aligning with the multifunctional material demands of modern electronic and biomedical technologies.
This study clearly demonstrates the versatility of graphene nanoplatelets as structural and functional enhancers in ferrite-based magnetic nanocomposites synthesized by SGAC, highlighting their pivotal role in enabling tunable performance for next-generation magnetic and dielectric applications.
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