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- W3045165718 abstract "Increasingly serious uranium pollution necessitates a new method for rapid qualitative and quantitative uranium detection. Some methods based on fluorescence spectroscopy and surface-enhanced Raman scattering (SERS) have been reported to detect uranyl ions (UO22+), the main species of uranium. However, various factors affect the fluorescence selectivity and SERS quantitative analysis. Herein we report on a composite material for a dual-mode fluorescence–SERS detection protocol for simultaneous quantitative and qualitative analysis of UO22+, based on a layer-by-layer assembly strategy, combining the advantages of the two complementary techniques. The composite material consists of a Fe3O4@SiO2 core coated by gold nanoparticles (FA) via electrostatic adsorption. The CdTe quantum dots (CdTe QDs) outside the FA are linked with amide bonds to form a satellite Fe3O4[email protected] nanostructure (FA-CdTe). The fluorescence signal of FA-CdTe was selectively quenched by UO22+, with a detection limit as low as 1.2 nM; the material was also used as a SERS substrate to detect the Raman mode of uranyl at 828 cm−1. Furthermore, this method has been applied for UO22+ detection in seawater, river water, and tap water, demonstrating the broad application prospects and providing novel development concepts." @default.
- W3045165718 created "2020-07-29" @default.
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- W3045165718 date "2020-12-01" @default.
- W3045165718 modified "2023-10-18" @default.
- W3045165718 title "Dual-mode fluorescence–SERS sensor for sensitive and selective detection of uranyl ions based on satellite Fe3O4-Au@CdTe nanostructure" @default.
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- W3045165718 doi "https://doi.org/10.1016/j.snb.2020.128644" @default.
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