Magnetite-polyoxometalate hybrid nanomaterials: Synthesis and characterization

摘要

Magnetite-polyoxometalate hybrid nanomaterials were prepared by surface modification of magnetite nanoparticles with polyoxometalates. Silica coating of magnetite nanoparticles with tetraethyl orthosilicate and then functionalization with aminopropyl trimethoxy silane (APIS) yielded aminopropyl modified silica coated magnetite nanoparticles (APTSCMNPs). Reaction of the resulted nanoparticles with H3PMo_(12)O_(40) and H3PW_(12)O_(40) heteropoly acids produced hybrid nanomaterials, PMo-APTSCMNPs and PW-APTSCMNPs, respectively. The resulted nanomaterials were characterized with different physico-chemical techniques such as Fourier transform infrared (FT-IR) and atomic absorption spectroscopies, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), and thermogravimetric analyzes (TGA and DTA). VSM analysis showed superparamagnetic properties of the materials and TEM and SEM analyses indicated the relatively uniform spherical nanoparticles with 20 nm average size.