Preparation of Magnetite Core-Titania Shell and Hollow Titania Nanoparticles via Layer-by-Layer (LbL) Assembly Method

摘要

Nanoparticles with uniform size and morphology have attracted a great deal of attention due to their unique material characteristics, such as large surface area, adsorption capacity and controllability. Core-shell nanoparticles, denned as nanoparticles with a core and shell of different materials, are designed to have better performance when compared with that of the core or shell material. Typical examples are found among inorganic shell/polymer core nanoparticles with excellent electrical, magnetic, catalytic, mechanical, chemical and optical properties compared to those properties of single component materials. These core-shell nanoparticles have been prepared by using template-based syntheses, but it is rather difficult to create uniform coatings of desired materials or their precursors on the corresponding templates. Frequently, incompatibility between the template and coating materials requires prior surface modification/ functionalization before the coating stage is performed.