Üretim parametrelerinin sürekli grafen lif özellikleri üzerine etkisi

Graphene is carbon-based material that has promising properties for different applications in energy, catalysts, radar absorber, sensor, etc. Due to its fascinating facilities, this material has been studied by many researchers. By these knowledges, continuous graphene fibres have been fabricated by wet-spinning method and co-coagulants processes have been employed respectively. Because of the excellent properties such as mechanical, thermal, chemical, electrical and economical properties it can be used for low cost production, easy processing with high yield. Graphene (G) is the material which is type of graphite with single layer. Visual properties of G is different from other carbon based materials. It has a 2-dimensional (2D) honeycomb structure and has sp2- bonded carbon atoms in its structure. There are several methods to obtain graphene. It can be directly obtained from graphite or may be obtained from reduction of graphene oxide (GO). Graphene oxide is obtained by the oxidation of graphite by different methods such as Brodie, Hummers or Staudenmaier. Among these, the most common method is Hummers method. The exfoliated GO sheets are highly oxidized and featured with the residual epoxides, hydroxides and carboxylic acid groups on their surfaces. This study reports the effect of processing parameters such as time, temperature of the exfoliation together with dispersion preparation methods of graphene oxide on the properties of continuous graphene oxide fibers produced by coagulation bath. Relationship between changing parameters and structural properties of graphene oxide fiber, fiber morphology, roughness, crystalline structure have been discussed. Higher exfoliation time leads to an increase in Tex count of fiber, while longer ultrasonic times resulted in lower tex count compared to both shorter ultrasound time and mechanical homogenization. Shorter ultrasonication period and shorter exfoliation time leads to higher electrical conductivity compared to mechanical homogenization. Shorter ultrasonication period results in slight tendency of an increase in breaking strength. Besides, the effect of exfoliation time and presence of activated carbon particle (AC) on graphene oxide fiber's properties has been analyzed. It has been seen that cross-sectional appearance of sample with AC is grating and rough because of AC. The addition of AC did not change the electrical conductivity. However, AC results in an enormous decrease in the mechanical properties. In the light of this study, optimal conditions for producing continuous graphene oxide fibers can be determined. This study can take an important role for further researches.