Preparation and protein detection of Zn-ferrite film with magnetic and photoluminescence properties

Abstract

Zn-ferrite film with hierachical structure and organic composite was prepared by the coprecipitation method, which has good ferromagnetism and photoluminescence (PL) properties. DMSA-modified Fe3O4 nanoparticles (NPs) with saturation magnetization of 55.6 emu/g were prepared by the one-step process, and bovine serum albumin (BSA) with different concentrations was bound on NPs by the carbodiimide method. After Fe 3O4-BSA NPs had been adsorbed onto Zn-ferrite film by magnetic forces, the PL intensity of the films was seen to increase linearly with BSA concentration in the range of 0.25-1.5 mg/mL, suggesting that the films could be used for protein detection. Copyright © 2010 American Chemical Society.