Preparation and Protein Detection of Zn−Ferrite Film with Magnetic and Photoluminescence Properties

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 Fe 3 O 4 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 3 O 4 −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.