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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Chemical Engineering

    Background:

    • Graphene oxide (GO)-based gels are promising for creating bulk materials that retain individual nanosheet properties.
    • The characteristics of these 3D gel networks are heavily influenced by cross-linking strategies.
    • Drying and annealing GO gels can yield aerogels with significant electrical conductivity and surface area.

    Purpose of the Study:

    • To investigate the impact of ammonia content and graphene oxide nanosheet morphology on the structure and properties of GO-based gels.
    • To explore the role of ammonia in the cross-linking reaction of GO gels.
    • To demonstrate the ability to tune gel and aerogel properties through controlled synthesis.

    Main Methods:

    • Preparation of graphene oxide (GO) gels using varying ammonia concentrations.
    • Utilizing spray-drying to create crumpled GO (cGO) nanosheets.
    • Characterization of gel and aerogel morphology, composition, electrical conductivity, and surface area.

    Main Results:

    • Ammonia content and nanosheet morphology (crumpled vs. flat) significantly affect the cross-linked structure and composition of GO gels.
    • Nitrogen incorporation into the gel structure indicates ammonia's active participation in the cross-linking reaction.
    • Achieved GO-based aerogels exhibit high electrical conductivity (560 S/m) and high surface area (1700 m²/g).
    • Spray-drying to produce cGO gels provides a method for tuning gel density, electrical conductivity, and surface area.

    Conclusions:

    • Ammonia is an active reactant in GO gel formation, not just a catalyst.
    • Controlling GO nanosheet morphology (e.g., using spray-drying for cGO) offers a versatile approach to tailor GO gel and aerogel properties.
    • This work provides a pathway for designing advanced graphene-based materials with specific electrical and surface characteristics.