This paper describes a facile hydrothermal procedure capable of aligning US nanocrystals on multiwalled carbon nanotubes (MWCNTs) without the use of organic bridging molecules such as cysteamine and carboxylates. The direct placement of US on MWCNTs allows good mixing and better interfacing between the two nanophases. The synthesis conditions can in principle be tuned to produce modulations in compositions,, phases, and crystal orientations to the need of optoelectronic and photonic applications.