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(A) SERS spectra of a 10−6 M NBA solution acquired at 40 spots on the MC/Ag NPs film. (B) SERS intensity of NBA at 590 cm−1 from 40 random points. (C) SERS spectra of a 10−6 M NBA solution acquired at 36 spots on the MC/Ag NPs film after incubation for two months at room temperature. (D) SERS intensity of NBA at 590 cm−1 from 36 random points.
