Surface modification of SiO2-coated FePt nanoparticles with Amino Groups

Abstract

Magnetic nanoparticles (NPs) with modified surface are important materials for applications in biological systems. In this paper, FePt NPs have been prepared by electrodeposition method. After annealing at 700°C for 1 h under a mixture of 5% H2 and 95% Ar atmosphere the FePt NPs exhibit the coercivity of 11.5 kOe. The FePt NPs are then coated with a layer of silica SiO2 by using the Stober method assisted by mechanical waves originated from a sonicator. The FePt/SiO2 NPs were easily bound with 3-aminopropyl-triethoxy-silance to have an amino surface. Analysis of transmission electron microscope reveales the core-shell structure of the NPs. © 2011 The Surface Science Society of Japan.