This study aimed to synthesize carbon nanostructured materials from waste engine oil (WEO) as a carbon source and ferrocene as a catalyst. The method used in this study was thermal chemical vapor deposition. Several parametric studies were conducted in order to optimize the production of carbon materials from WEO. The parameters were synthesis temperatures, catalyst concentrations, precursor temperatures and volumes, synthesis times and different types of WEO. The samples were characterized using electron microscopy, energy dispersive X-ray, X-ray diffraction, micro-Raman spectroscopy and thermogravimetric analysis. Electrical and field emission properties of the selected samples were analyzed using four-point probe and field electron emission (FEE) measurements. The findings showed that two different structures of carbon materials namely carbon spheres (CS) and carbon nanotubes (CNTs) were succesfully synthesized from WEO. High density CS were produced from 3 ml of WEO mixed with 5.33.....

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