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Annasamy, Gowri. Optical Materials (2025): 117024.
Graphene oxide (GO) was utilized in the green synthesis of graphene oxide-gold nanocomposites (GOAu), enabling sensitive detection of zinc complexes via surface-enhanced Raman spectroscopy (SERS). The synthesis followed a one-pot, eco-friendly protocol using green tea extract as a natural reducing agent.
First, 50 mL of GO solution was sonicated for 90 minutes to achieve full exfoliation into individual graphene layers, maximizing surface area and reactivity. Simultaneously, 50 mL of HAuCl₄ (tetrachloroauric acid) solution was prepared as the gold precursor. The two solutions were combined and mixed thoroughly in the presence of the green tea extract, which reduced Au³⁺ ions to Au⁰ nanoparticles and simultaneously anchored them onto the GO sheets.
The reaction mixture was maintained at room temperature to allow complete reduction and composite formation. The resulting dispersion was then cooled and centrifuged at 7000 rpm for 20 minutes to remove unbound materials and collect the GOAu nanocomposite. The final product was stored at 4 °C for future characterization and application.
This facile and scalable method yielded highly active GOAu composites, which showed ~21-fold enhancement in Raman signal intensity compared to individual GO or AuNPs, offering a powerful SERS platform for label-free detection of zinc complexes in nutritional analysis.
Zeb, Shakeel, et al. International Journal of Biological Macromolecules (2025): 140085.
Graphene oxide (GO) was employed in the synthesis of a chitosan-graphene oxide-based biomacroporous cryogel, designed for the selective adsorption of myricetin from complex matrices like garlic and apple juices. This hybrid material was fabricated via redox cryopolymerization, integrating GO with biopolymer chitosan and vinyl monomers.
The preparation began by converting AMPS to its sodium salt using NaOH. A reaction mixture containing AMPS (0.3 g), VP (0.1 g), CS (0.45 g), GO (0.04 g), MBA (0.06 g), and TMEDA (0.077 g) was dissolved in 20 mL deionized water under nitrogen purging for 40 minutes to eliminate oxygen. Acetic acid (400 μL) was added to aid complete chitosan dissolution, indicated by a clear solution. Separately, an APS initiator solution (1 mL, 0.006 M) was prepared.
Both solutions were chilled to -5 °C, rapidly combined, and placed in a cryothermostat at -16 °C for 24 hours to induce cryopolymerization. The resulting cryogel was then thawed, repeatedly washed with deionized water, and freeze-dried. The GO content and initiator concentration were optimized to balance radical reactivity and minimize undesirable interactions with GO sheets.
The resulting GO-based cryogel exhibited high structural integrity and selectivity, demonstrating its potential in pharmaceutical compound extraction.
Aalhusaini, Taha, Dattaprasad Pore, and Gajanan Rashinkar. Journal of Organometallic Chemistry (2025): 123637.
Graphene oxide (GO) was utilized as a solid support in the stepwise synthesis of a novel heterogeneous catalyst, GOsingle bondCaff-NHC@Ni, which effectively catalyzes C-H arylation reactions between benzoxazole and aryl boronic acids. The synthetic route began with the functionalization of GO using (3-chloropropyl)triethoxysilane. GO (8.0 g) was dispersed in xylene (50 mL) with the silane reagent (10.8 mL, 45 mmol) and refluxed for 24 hours. The resulting 3-chloropropyl graphene oxide was isolated by centrifugation, washed with THF, and vacuum dried.
Next, the chloropropyl-functionalized GO (8.0 g) was reacted with caffeine (2.14 g, 11 mmol) in DMF (25 mL) at 80 °C for 72 hours to afford [GOsingle bondCaff]Cl. Post-reaction, the solid was thoroughly washed with DMF, MeOH, and CH₂Cl₂, then dried under vacuum.
Finally, the nickel complex was synthesized by refluxing [GOsingle bondCaff]Cl (1 g) with nickel acetate (0.176 g, 1 mmol) and K₂CO₃ (0.138 g, 1 mmol) in 1,4-dioxane (25 mL) for 24 hours. The catalyst was purified by centrifugation and THF washing. The resulting GOsingle bondCaff-NHC@Ni complex demonstrated efficient reusability and catalytic activity under mild conditions.
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