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  • Fractal dimension and phase transition of graphene oxide (GO) doped polyacrylamide 

    Authors:Evingür, Gülşen Akın; Pekcan, Önder
    Publisher and Date:(ELSEVIER SCI LTD, 2020)
    Graphene Oxide (GO)- Polyacrylamide composites prepared between 5 and 50 mu l GO were performed by Fluorescence Spectroscopy. The phase transition performed on the composites was measured by calculating the critical exponents, beta and gamma, respectively. In addition, fractal analysis of the composites was calculated by a fluorescence intensity of 427 nm. The geometrical distribution of GO in the composites was calculated based on the power law exponent values using scaling models. While the ...

  • Optical energy band gap of PAAm-GO composites 

    Authors:Evingür, Gülşen Akin; Pekcan, Önder
    Publisher and Date:(Elsevier Science, 2018)
    Graphene oxide (GO) can be used as an electron acceptor for polymers. The generation of the exciton in such materials is intimately related to the optical band gap. Polyacrylamide (PAAm) - graphene oxide (GO) composites were prepared via free radical crosslinking copolymerization with GO content varying in the range between 5 and 40 mu l of GO. The influence of the GO content on the optical properties of the composites is characterized by ultraviolet visible spectrophotometer. The optical band gap ...