Space-borne instruments, such as exo-atmospheric optical sensors and seeker telescopes, require low reflectivity surfaces to minimize stray and reflected light across the visible and infrared wavebands. Black surface coating treatments have been demonstrated as effective approaches to obtain low reflective surfaces. The surface features and intrinsic properties of the coating materials play an important role for scattering, absorbing, or trapping light. The excellent optical absorption performance, light weight, and large surface areas of carbon nanotubes (CNTs) make them as ideal coating materials for obtaining low reflectivity surfaces. Within this context, Faraday Technology Inc. is developing an electrophoretic deposition process to deposit dense, multi-walled carbon nanotubes onto test substrates. Specifically, we are evaluating the effect of bath formulation and pulsed electric field deposition parameters then characterizing the deposited CNT coatings by reflectance spectra. The bath formulation was controlled by modifying the surface charge of the carbon nanotubes by polymer dispersants or bound functional groups, next these functionalized materials were electrophoretically deposited onto the substrates under an applied pulsed electric field. As shown in Figure 1, it is possible to achieve a uniform CNT coating on a stainless steel substrate (Figure 1 Inset) that achieves a diffuse reflectance of 0.8% ~ 1.2% over the visible range. Currently, we are working to optimize the pulsed electric field conditions to achieve lower reflectivity CNT coating formation. If successful this program will demonstrate a scalable technique for producing CNT black coatings can not only be used for minimizing stray and reflected light for space-borne instruments, but also offer potential applications in other optical related devices which request low reflective surfaces, such as solar cells. Acknowledgements: The financial support of NASA Contract No. 80NNSC18P2062 is acknowledged. Figure 1