Self-assembly of a covalently attached magnetic film from diazoresin and Fe3O4nanoparticles

Abstract

On different substrates, such as the quartz wafer, mica and silicon, a stable magnetic ultrathin film was fabricated layer-by-layer using the self-assembly method, through the electrostatic interaction between the polycations of diazoresin (DR) and negatively charged Fe₃O₄ nanoparticles. The results of UV–Vis spectra, magnetization measurements and AFM for DR–Fe₃O₄ films show that the assembly is very successful. After UV irradiation, the ionic bonds of the film convert to covalent ones and the stability of the magnetic film against etching by the polar solvents or salting liquids increases dramatically.