Europium Nanoparticles

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europium nanoparticles are black spherical high surface area particles available in both dispersed and coated forms. They are typically 10 – 45 nm in size with specific surface areas of 30 – 50 m2/g.

They are very active luminescent materials and their properties can be boosted significantly by co-casting with a polymeric matrix. Consequently, they are used for various applications in bio-imaging, diagnostics and biomarker development.

We have developed a highly sensitive fluorescent immunochromatographic test strip (FICTS) for the detection of citrinin in Monascus fermented foods using EuNP-based labeling. The sensitivity of the immunoassay was improved 25-fold compared to the conventional colloidal gold-based assay, making it an excellent tool for rapid food safety assessment.

The morphology of the Eu-shell and Fe-core fibers co-cast was characterized by scanning electron microscopy (SEM). X-ray diffraction showed that the resulting polymeric fibers are spherical in shape. UV-vis and luminescence characterizations confirmed the presence of europium, the occurrence of iron, and the existence of an intensive red light emission from europium.

The intense emission of the Eu-shell fibers originates from two transitions of europium: the 5D0 7F1 and the 5D0 9F1 transitions. In addition, the luminescence intensity of the Eu-shell fibers is strongly correlated with the concentration of iron in the solution. These results show that the europium-shell based polymeric micro- and nanofibers may be useful for various applications such as chemical sensing, bio-imaging probes or road flares. They can also be used for DNA detection because of their exceptional quenching capability for single-stranded DNA and lysozyme.