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SERS spectra of DI water and quinoline-spiked DI water in the concentration range between 5 ppb and 50 ppm collected using the (a) self-assembled SERS substrate and (b) SERStrate. Relationship between the log values of Raman intensity of the quinoline peak at 770 cm–1 and log values of quinoline concentration using the (c) self-assembled SERS substrate and (d) SERStrate.
