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Article Abstract
We developed a highly efficient, ultra-sensitive, and selective dual detection sensor for hypochlorite (ClO) and sulfite (SO) ions based on surface-enhanced Raman scattering (SERS) spectroscopy. 3,3',5,5'-Tetramethylbenzidine (TMB) is oxidized by ClO under acidic conditions to diazotized oxTMB that, when electrostatically adsorbed onto Au nanoparticles (NPs), produces a strong Raman signal at 1605 cm. Meanwhile, oxTMB is reduced to TMB by SO, which significantly reduces the Raman signal. The linear detection range of the proposed sensor is 10 to 10 M with a detection limit of 59 pM for ClO and 10 to 10 M with a detection limit of 5.4 nM for SO. In addition, the sensor was successfully applied to detect ClO and SO in water samples.
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