Abstract

• Currently, nanoparticles with controlled morphology have tremendously attracted attention due to their wide application in catalysis, energy storage, and biomedicine. It is well known that hollow nanospheres with controlled size and shape show better performance compared to the conventional dense nanoparticles. In this research, Co/Fe oxide hollow nanospheres with diameter around 272 nm have been fabricated by using polymeric micelles of poly (styrene-block-acrylic acid) (PS-b-PAA) as a template. The polymer forms spherical micelles with PS-core and PAA-corona in aqueous solutions. According to the transmission electron microscopic (TEM) result, the void space of the fabricated hollow nanospheres is around 17 1 nm. The prepared Co/Fe oxide hollow nanospheres became shrunk during calcination. Fourier transform infrared resonance (FTIR) measurements confirm that the template polymer was completely removed during calcination