Syntesis, characterization and surface structure of Ag@Fe3O4 core-shell nanocomposite

Abstract

The method of one-pot synthesis of Ag@Fe3O4 nanoparticles consisting of a spherical core of magnetite and silver islet shell has been developed. The particles are almost monodispersed with the average size d> ~ 23 nm. The silver nanoparticles form of islands (20-100 atoms) on the surface of magnetite. As-synthesized core-shell nanocomposities Ag@Fe3O4 have good perspectives of applications, including chemical and biological sensing, due to the broad absorption in the optical region associated with localized surface plasmon resonance. Formation of Ag@Fe3O4 composite structures such as "core-shell" will allow combining magnetic controllability of the magnetite core with bactericidal and bacteriostatic properties of the silver shell. This effect is very interesting from the perspective of using particles with the "core-shell" structure in pharmacy and medicine to create new medicines.