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(a) Raman spectra of R6G with different concentrations (10−5 M to 10−8 M) on G/Au substrate. (b) Peak intensity alteration over different concentrations of R6G under logarithmic coordinates. (c) Color mapping for the Raman spectra of the peak intensities at 613 cm−1 (10−8 M R6G) measured on 100 random points. (d) Raman spectra of R6G with different batches (1–7) of G/Au substrates. (e) Raman spectra of R6G collected from G/Au substrate within 7 days.
