Aerosol Flame-Based Synthesis of Crumpled Reduced Graphene Oxide
MetadataShow full item record
In recent years, three-dimensional graphene-based materials have attracted considerable research attention. Continuous development of new preparation strategies have led to production of material with controllable morphologies and stable performance. These versatile structures can exhibit exceptionally large surface area, excellent electronic and thermal conductivity, superb chemical, thermal, and electrochemical stability, enhanced active material per area, fast ion and electron transport, superior mechanical strength, and high flexibility. Their unique combination of properties can enable improved performance in fuel cells, electrodes in batteries and supercapacitors, conductive inks for printed electronics, wastewater treatment, and many other areas. The emergence of graphene-enabled products in both research and commercial areas in turn drives the need for methods for large-scale manufacturing these unique structures. In this thesis, a novel aerosol flame-based synthesis method of producing 3D crumpled reduced graphene oxide (CRGO) was demonstrated, based on the High Temperature Reducing Jet (HTRJ) reactor system. As a part of this process, an aqueous graphene oxide (GO) precursor solution was prepared by a modified Hummers’ method and injected into the throat of a converging-diverging nozzle through which the hot combustion products of a fuel-rich hydrogen flame are accelerated. The hot, high-velocity gas stream atomizes the GO precursor. The resulting precursor droplets evaporate and decompose, yielding a crumpled structure of RGO nanosheets in a reducing environment containing excess H2. This method is a continuous, scalable and easily operated process that is suitable for producing CRGO and metal-decorated CRGO. Detailed characterization of the GO and RGO presented in this thesis demonstrate the formation of well-exfoliated sheets with all of the expected structures and functional groups.