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- W4211149602 abstract "Solid-state SERS sensors are desirable point-of-care tools due to their portability. However, the level of SERS sensitivity achieved in liquid phase is rarely duplicated in the solid phase. We report herein the fabrication of a SERS sensor using alumina beads as the solid support and demonstrate its high SERS sensitivity with the model analyte 4-aminophenyl disulfide (4-APDS). The key to sensitivity is a hydrophilic-hydrophobic surface gradient constructed by sequentially coating with the surfactant cetyltrimethylammonium bromide and fluorous 1H,1H,2H,2H-perfluorooctyltriethoxysilane. The surface gradient, together with chloride etching, allows the detection of 4-APDS at the low concentration of 10-15 M. The practicality of the sensor beads is evidenced by successfully tracking the SERS fingerprints of five food colorant standards in the SERS spectra of a popular candy product. These SERS sensor beads are easy to prepare, convenient to use, and highly responsive as a SERS platform for the analysis of colorants." @default.
- W4211149602 created "2022-02-13" @default.
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- W4211149602 date "2022-07-01" @default.
- W4211149602 modified "2023-10-16" @default.
- W4211149602 title "Differential surface partitioning for an ultrasensitive solid-state SERS sensor and its application to food colorant analysis" @default.
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- W4211149602 doi "https://doi.org/10.1016/j.foodchem.2022.132415" @default.
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