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

Abstract

A new type of bifunctional nanocomposites for biomedical applications, upconversion NaY F(4):Y b(3+), Tm(3+) nanoparticles coated with Ru(II) complex chemically doped SiO(2), has been developed by combining the useful functions of upconversion and oxygen-sensing properties into one nanoparticle. NaY F(4):Y b(3+), Tm(3+) nanoparticles were successfully coated with an Ru(II) complex doped SiO(2) shell with a thickness of approximately 30 nm, and the surface of the SiO(2) 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 SiO(2), 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.

Rapid response oxygen-sensing nanofibers

“…[35, 36] The core-shell fiber being investigated improves sensor performance in several respects: (1) the PES provides greater mechanical support for the sensor; (2) the PES core better protects the probe from photobleaching; (3) the PCL shell improves biocompatibility versus PES alone; (4) the addition of a probe-free shell structure could potentially slow probe leaching within the polymer matrix. The morphology typical of electrospun fiber is retained and the core-shell fibers have diameters of 0.96 ± 0.32 μm.…”

Nanomaterials and the environment: A review for the biennium 2008–2010

“…Nanomaterials with applications in electronics include lithium complexes [137], copper-selenium complexes [138], Co-B NMs [139], and silicates-rubber-polypyrrole complexes [140]. Nanomaterials for sensors applications were Zn-Mn-Fe NMs [141], NaYF 4 :Yb 3+ coated NM [142], Ag-l-cysteine NPs [143]. New NMs with optical applications were Gd 2 O 3 :Eu 3+ nanophosphors [144], CdS nanocomposite [145], and CdTe quantum dots [146].…”

Uniform NaYF4:Yb, Tm hexagonal submicroplates: Controlled synthesis and enhanced UV and blue upconversion luminescence

“…Therefore, the cross relaxation process of 3 F 2(3) + 3 H 4 ! 3 H 6 + 1 D 2 between Tm 3+ ions may all alternatively populate 1 D 2 level of Tm 3+ [61][62][63]. Then UV emission centered at 346 nm ( 1 D 2 !…”