This paper aims to obtain the effect of nickel coating on the wet impregnation method on 316 stainless steel (SS 316) catalytic substrate which received initial treatment with Oxidative Heat Treatment (OHT) using a flame synthesis reactor with a carbon source of polypropylene (PP) waste on the growth of carbon nanotubes (CNT). Nickel coating on SS 316 is intended to improve the quality and quantity of CNT that have not been obtained in previous studies. Variations in nickel loading are 5% and 10%. The results showed nickel coating could increase CNT yield by only 8.4%. However, the CNT produced from nickel coating on SS 316 substrates have better quality. The characterization of XRD showed that the peak intensity of the CNT is at 2θ = 26o and 43o. This CNT still contained some impurities in the form of amorphous carbon such as Fe3O4 and Fe3C. The effect of heating at high temperatures on the nickel layer resulted in the presence of NiO compounds in CNT samples. SEM results showed that there were still amorphous carbon and other impurities as detected in the XRD results. The characterization of EDX supported the XRD results which show that there was no significant percent mass increase in carbon. In TGA results, the nickel layer could increase the thermal stability of the CNT because the CNT has a percentage decrease in mass at 620oC oxidation temperature. The best CNT results shown in nickel coating are 10% both regarding yield and quality because the substrate surface can prepare contact space between the active core and the reactants so that more CNTs will grow on the surface.
Keywords: CNT, Nickel, Polypropylene, SS 316, Wet Impregnation