Synthesis and characterization of new bifunctional nanocomposites possessing upconversion and oxygen-sensing properties

Document Type

Article

Publication Date

7-8-2010

Abstract

A new type of bifunctional nanocomposites for biomedical applications, upconversion NaY F4:Y b3 +, Tm3 + nanoparticles coated with Ru(II) complex chemically doped SiO2, has been developed by combining the useful functions of upconversion and oxygen-sensing properties into one nanoparticle. NaY F4:Y b3 +, Tm3 + nanoparticles were successfully coated with an Ru(II) complex doped SiO 2 shell with a thickness of ∼ 30nm, and the surface of the SiO2 was functionalized with amines. The obtained nanocomposites exhibited bright blue upconversion emission, and the luminescent emission intensity of the Ru(II) complex in the nanocomposites was sensitive to oxygen. Compared with the simple mixture of Ru(II) complex and SiO2, the core-shell nanocomposites showed better linearity between emission intensity of Ru(II) complex and oxygen concentrations. These bifunctional nanocomposites may find applications in biochemical and biomedical fields, such as biolabels and optical oxygen sensors, which can measure the oxygen concentrations in biological fluids. © 2010 IOP Publishing Ltd.

Publication Source (Journal or Book title)

Nanotechnology

This document is currently not available here.

Share

COinS