Synthesis and characterization of a new trifunctional magnetic- photoluminescent-oxygen-sensing nanomaterial

Document Type

Article

Publication Date

12-10-2008

Abstract

Magnetic Fe2O3 nanoparticles coated with SiO 2 chemically doped with a Ru(II) complex were prepared using a simple solution based method. Field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) showed that the Fe2O 3 nanoparticles with a mean diameter of ∼115 nm were successfully coated with Ru(II) complex-chemically doped SiO2 shell with a thickness of ∼30 nm. The obtained nanocomposite material showed a strong magnetic response to a varying magnetic field, exhibited the bright red triplet metal-to-ligand charge transfer (3MLCT) emission, and its photoluminescent intensity was sensitive to oxygen concentration. Compared with the Ru(II) complex in silica gels, the Ru(II) complex in the magnetic-optical-oxygen-sensing nanocomposite demonstrated improved thermodynamic stability of emissions. These nanocomposites are also nontoxic and easily conjugated with biomolecules. Their magnetic, photoluminescent and oxygen-sensing properties make them promising candidates for cell separation, biomarkers and optical oxygen sensors, which can measure the O2 concentration in biological bodies. © IOP Publishing Ltd.

Publication Source (Journal or Book title)

Nanotechnology

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