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(a) Dependence of the average SERS intensity at 1074 cm−1, with the logarithm of the p-MBA concentrations. (b) SERS intensities distribution at 1074 cm−1 for the Raman mapping on AuNHAS of the 10−6 mol L−1 p-MBA solution. Laser wavelength: 633 nm; laser power: 2.5 mW.
