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• W2090618504 startingPage "8864" @default.
• W2090618504 abstract "Infrared-to-visible upconversion phosphors (i.e., rare earth ion-doped Y2O3 nanoparticles (UNPs)) were synthesized by the homogeneous precipitation method. Because the charge on the erbium (Er) ion-doped Y2O3 (Y2O3:Er) NP (UNP1) surface is positive under neutral conditions, the UNP1 surface was electrostatically PEGylated using negatively charged poly(ethylene glycol)-b-poly(acrylic acid) (PEG-b-PAAc). The adsorption of PEG-b-PAAc was confirmed by Fourier transform infrared (FT-IR) measurements and thermal gravimetric analysis (TGA). The surface charge of the PEGylated UNP1s (PEG-UNP1s) was effectively shielded by the PEGylation. The dispersion stability of the UNP1s was also significantly improved by the PEGylation. The PEG-UNP1s were dispersed over 1 week under physiological conditions as a result of the steric repulsion between the PEG chains on the UNP1 surface. The upconversion emission spectrum of PEG-UNP1s was observed under physiological conditions and was confirmed by near-infrared excited fluorescence microscope observation. Streptavidin (SA)-installed ytterbium (Yb) and Er ion-codoped Y2O3 (Y2O3:Yb,Er) NPs (UNP2s) were prepared by the coimmobilization of PEG-b-PAAc and streptavidin. The PEG/SA coimmobilized UNP2s (PEG/SA-UNP2s) specifically recognized biotinylated antibodies and emitted strong upconversion luminescence upon near-infrared excitation. The obtained PEG/streptavidin coimmobilized UNPs are promising as high-performance near-infrared biolabeling materials." @default.
• W2090618504 created "2016-06-24" @default.
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• W2090618504 date "2008-07-24" @default.
• W2090618504 modified "2023-10-16" @default.
• W2090618504 title "Design of Poly(ethylene glycol)/Streptavidin Coimmobilized Upconversion Nanophosphors and Their Application to Fluorescence Biolabeling" @default.
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• W2090618504 doi "https://doi.org/10.1021/la801056c" @default.
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