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Highly hydrophobic nature of carbon nanotubes makes them a promising material for coatings with better corrosion resistance [1,2]. Their application includes using them as a pure coating material [3] or incorporating into the matrix as a reinforcement material [4]. Therefore, several synthesis methods such as laser ablation, electric arc discharge, plasma advanced and chemical vapor deposition have been explored for production of high-quality nanotubes. Of these chemical vapor deposition (CVD) (using nanoparticles as a catalyst) has been proven to produce CNTs at large scale with reasonable quality and lower cost. Most reports that mention carbon-nanotubes based coatings describe the process in two steps, which involves synthesis of nanotubes and dispersing them into a suitable solvent followed by coating it over the substrate [5]. This paper presents a one-step method for directly growing carbon nanotubes over mild steel substrate.

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