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(a) Raman spectrum of DA at different concentrations (1000−1 ppm) acquired on AgNPs−DE SERS substrates. (b−c) Enlarged view of the acquired DA Raman spectrum over selective wavenumbers for detailed peak analysis. (d) Calibration curve representing relationship between DA concentration and Raman signal intensity. Notations s, m and vw represent strong, medium and very weak signal intensity respectively.
