Samples data with dyes 10, 1 and 9. The Raman shift and Raman intensity maxima for the target and control spectra are reported, with the respective standard deviations calculated on the 4 replicates, at different concentrations of dye. In the last column are reported the on/off ratios.

Dye no.	Dye equivalents	Peak position (cm−1)	Av comp SERS intensity (counts)	Av non-comp SERS intensity (counts)	Ratio (comp : non-comp)
10	1000	1607	91 ± 4	44 ± 6	2.06
	3000		139 ± 10	62 ± 7	2.25
	5000		179 ± 13	80 ± 15	2.24
	7000		245 ± 16	112 ± 13	2.18
1	1000	1316	199 ± 7	11 ± 12	1.79
	3000		415 ± 16	244 ± 13	1.70
	5000		538 ± 34	189 ± 31	1.86
	7000		630 ± 63	290 ± 20	2.17
9	1000	1607	917 ± 82	409 ± 57	2.24
	3000		1351 ± 101	660 ± 69	2.05
	5000		1513 ± 103	741 ± 56	2.04
	7000		1282 ± 134	596 ± 89	2.15