Highly effective surface-enhanced Raman scattering-active gold substrates prepared by using electrochemical methods in the presence of hexadecyltrimethylammonium bromide

SERS spectra of 2 × 10−5 M R6G adsorbed on Au substrates roughened in different solutions: (a) in 0.1 M HCl; (b) in 0.1 M HCl containing 0.001 g/L CTAB; (c) in 0.1 M HCl containing 0.01 g/L CTAB.