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(a) SERS signals of PA adsorbed at different concentrations on AgNP-decorated PS PC substrates: (A) 10−4 mol/L, (B) 10−5 mol/L, (C) 10−6 mol/L, (D) 10−7 mol/L, (E) solid PA and (b) the relationship between the Raman intensity (938 cm−1) and PA concentrations.
