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Raman spectra: (a) bare (A5M) and silver modified (A5M3S) SiNWs for 10−6 M R6G aqueous solution in comparison to R6G solid powder. SERS spectra of the A-series substrates (b) A5M3S, (c) A5M6S and (d) A30M3S for different R6G concentrations in the range of 10−4–10−6 M under identical conditions at 514 nm.
