This research aimed to grow multi-wall CNTs in the selected area. The thermal reflow process was employed in this study to generate the mask for regional growth. Hot pressing and high temperature lapping were also used to diffuse iron into the aluminum alloy and brass substrates so that CNTs could grow on it. The obtained specimens were subsequently used to go through series heat dissipation tests. The results showed that CNTs could successfully grow on substrates using the proposed methods and the CNTs covered specimens exhibited the best heat dissipation efficiency amongst all the tested base materials.