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Apr 30, 2026
2:47 AM
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Alizarin Red S (ARS) has been demonstrated as a multifunctional agent in the synthesis of polypyrrole (PPy)/graphene composite aerogels (PGA) through a one-step hydrothermal method. ARS serves as a crosslinker, oxidant, reductant, and dopant, facilitating the formation of a robust three-dimensional porous network.
In the synthesis process, graphene oxide (GO) aqueous solution was ultrasonicated, followed by the addition of ARS. Pyrrole was then introduced to form a GO-ARS-pyrrole (GO-ARS-Py) assembly via hydrogen bonding and ?-? interactions. The mixture was subjected to hydrothermal treatment at 180 °C for 10 hours, resulting in the formation of PGA composites. Atomic force microscopy (AFM) confirmed the increased thickness of GO upon ARS modification (from 2-4 nm to 5-7 nm), supporting the formation of GO-ARS assembly.
ARS played a dual role in oxidation and reduction during the reaction. It facilitated the oxidation of pyrrole to PPy while being reduced to r-ARS. The r-ARS further reduced GO by removing hydroxyl and epoxy groups, subsequently reverting to ARS. Covalent ester bonds were formed between the -OH groups of r-ARS and the -COOH groups of reduced GO (RGO), establishing a physical/chemical double cross-linking network. This enhanced the structural stability and doping efficiency of the composite aerogels.
The multifunctionality of ARS in oxidation, reduction, crosslinking, and doping highlights its critical role in enhancing the electrical conductivity, mechanical strength, and structural integrity of PPy/graphene composite aerogels, making it a promising material for energy storage and sensor applications.
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