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- W2743313551 abstract "This study demonstrates a novel strategy for colorimetric/fluorescent/surface enhanced Raman scattering (SERS) triple-mode sensing of nitrite based on Griess reaction modulated gold nanorods (GNRs)-Azo-gold nanoparticles (GNPs) (GNRs-Azo-GNPs) assembly. The p-aminothiophenol (PATP)-capped GNRs ([email protected]) and 1,8-diaminonaphthalene (DAP)-modified GNPs ([email protected]) are first synthesized through Au–S and Au–N bonds, respectively. Upon being excited at 365 nm, the dispersion of GNRs-GNPs ([email protected] and [email protected]) emits cyan fluorescence. Next, the addition of nitrite into the GNRs-GNPs induces the formation of GNRs-Azo-GNPs assembly, resulting in the enhancement of color and decrease of fluorescence. Therefore, the GNRs-Azo-GNPs assembly can not only be used as a naked-eye indicator of nitrite changed from orange-yellow to purple, but also as a highly selective ‘‘fluorescence quenching’’ probe due to the fluorescence resonance energy transfer (FRET) between azo-moiety and DAP. The limit of detection (LOD) for nitrite is 0.05 μM by colorimetry and 0.01 μM by fluorescence. Meanwhile, the GNRs-Azo-GNPs assembly possesses controllable core–satellites nanostructures and enables on-field SERS detection of nitrite with the LOD of 0.8 nM. More importantly, the GNRs-GNPs sensing system can not only be used as a paper-based test strip for on-site fast screening of nitrite with a high sensitivity and selectivity, but also as a SERS substrate for reliable quantitative analysis of nitrite. This study offers a new method for on-site visual detection of nitrite in human urine and meat products, as well as provides a strategy for designing multi-mode sensing platform for various applications." @default.
- W2743313551 created "2017-08-17" @default.
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- W2743313551 date "2018-01-01" @default.
- W2743313551 modified "2023-10-14" @default.
- W2743313551 title "Griess reaction-based paper strip for colorimetric/fluorescent/SERS triple sensing of nitrite" @default.
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- W2743313551 doi "https://doi.org/10.1016/j.bios.2017.08.008" @default.
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