Evaluating the impact of sonication process on graphene oxide structural properties

Authors : Fatih Sargın, Funda Ak Azem, Kürşat Kanbur, Işıl Birlik, Ahmet Türk

Pages : 1139-1149

Doi:10.28948/ngumuh.1470478

View : 94 | Download : 131

Publication Date : 2024-10-15

Article Type : Research Paper

Abstract :Graphene oxide (GO) is one of the members of carbon-based nanomaterials and can be featured as a graphene structure decorated with various oxygenated functional groups. Hummers method is one of the most known and versatile methods for the production of GO nanomaterials because of its ease of application, parameter controllability, and high yield. This process enables graphite oxidation and exfoliation into single or multi-layered GO sheets. Exfoliation separates multilayered graphite oxide flakes or particles; it forms single layer GO by forcing oxidizing agents or solvent molecules between layers. The sonication process can exfoliate the oxidized layers, resulting in the formation of GO structure when the exfoliated layers consist of only one or a few layers of carbon atoms. This process is considered among the key parameters of the Hummers method that influence the characteristics of GO-based nanomaterials. In this study, the impact of sonication process parameters, duration time, and power on morphological and structural characteristics of GO development was examined. For this purpose, characterization studies were performed by using a Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, and Raman spectroscopy analysis. It has been determined that the increase in applied sonication power and duration causes the distance between layers to decrease and defects to increase in the resulting GO structure. The findings revealed that the sample treated with the lowest power and shortest sonication time had the highest interlayer distance value of 7.83Å and the lowest C/O ratio of 1.62. Consequently, it exhibited the highest oxidation level compared to the other samples.
Keywords : grafen oksit, eksfoliasyon, sonikasyon