The Synthesis of Superparamagnetic Pt/Ni Nanohybrids in Direct Micelles of Cationic Surfactants

Abstract

Pt/Ni nanohybrids were synthesized by the reduction of the corresponding salts with hydrazine hydrate in aqueous micellar 0.005, 0.02, and 0.15 M solutions of cetyltrimethylammonium bromide. The size, shape, particle size distributions, and superparamagnetic properties of the nanohybrids were studied. The spherical and rod-like shapes of the nanoparticles obtained were discussed in terms of the dualistic model of surfactant micelle formation, according to which Ni2+ and hydrazine hydrate were solubilized inside hydrated micelles in water, in which molecules were linked by weak H-bonds with each other. Hydrated spherical and rod-like micelles played the role of templates in the synthesis of spherical and rod-like nanohybrids.