In the present research work the impact of molarity of the ferrocene solution on the CNT growth using microwave irradiation was studied. The CNT was grown on CF with microwave irradiation using 0.1 M, 0.2 M, 0.3 M, 0.4 M and 0.5 M, respectively ferrocene solution. The CNTs were successfully developed on the CF surface with the assistance of stepped microwave irradiation and ferrocene as the catalyst of varying concentrations. The step microwave irradiation process involves 25 s of continuous irradiation, followed by a 15 s period without irradiation, and then an additional 5 s of irradiation on the same sample. The SEM analysis inferred that with increasing concentration of the ferrocene solution the CNT forest becomes denser. The SEM results were further correlated with micorbond test, which revealed that CNT grown CF with 0.5 M ferrocene solution showed the maximum enhancement in IFSS by 25.15% compared to the virgin CF and the 0.1 M showed the least enhancement in IFSS by 4.88%. It was observed that with increasing CNT forest the IFSS value also increases due to increase in surface area. The IFSS might have increased due to better mechanical interlocking between the CF and the matrix at the interface as result of more anchorage sites provided by the dense network of CNT at the fiber/matrix interface.