Development of graphene oxide based functional materials

Date

2023-9-04

Author

Doğan Kavak, Öznur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

144
views

121
downloads

Cite This

Especially within the last decade, graphene oxide has attracted tremendous attention as a material that can yield two dimensional and three dimensional structures. The functional groups present in the structure of graphene oxide enable modifications and functionalizations, which brings it forward in obtaining those structures. In this study, firstly graphene oxide was synthesized and reduced using both hydrothermal and chemical reductions for related applications. Secondly, the behavior of bare graphene oxide aerogels and composite aerogels with dopamine, as sorbent materials for water remediation, was examined. Remarkable improvements were made in absorption capacities for organic solvents and sunflower oil up to 400 mg/mg. Approximately 80 % absorption efficiency was observed after repetitive absorption- desorption cycles. Thirdly, performance of graphene oxide and zeolite based aerogels in catalytic conversion of methane to methanol was evaluated. Use of composite aerogels for this purpose was found to be less effective and more complicated than using bare zeolites. Fourthly, reduced graphene oxides and their mixtures with 1T-MoS2 were examined as possible electrode materials. By using graphene oxide reduced by ascorbic acid and its mixtures with 1T-MoS2, approximately 50% increase was obtained in the specific capacitance of bare reduced graphene oxide electrodes. Fifthly, a practical method was presented to produce nanocomposite electrodes based on rGO-MoS2 aerogels. Following nanocomposite formation, an increase from 67% to 81% was obtained in the cyclic life of the electrodes. Specific capacitance of the rGO-MoS2 nanocomposite electrodes was found to be approximately 60% higher than that of bare rGO@nickel foam electrode. Lastly, polysulfon films with ordered pores were obtained via breath figure method using a GO based surfactant, GO-DODA. Effects of relative humidity, solvent type, humid air flow rate, polymer and GO-DODA concentrations on pore formation and regularity were investigated. Therefore, based on the results of this study, it can be suggested that graphene oxide is a promising material to obtain functional materials such as absorbants, catalysts, and electrode materials.

Subject Keywords

Graphene Oxide, Composite, Aerogel, Reduction, Application

URI

https://hdl.handle.net/11511/105992

Collections

Graduate School of Natural and Applied Sciences, Thesis