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SERS spectra of various concentrations (i) 10−4, (ii) 10−5, (iii) 10−6 M methanolic solution of R6G adsorbed on (a) Os and (b) rGO-Os hybrid nanostructured films under 532 nm laser excitation. The asterisks show the D band (1345 cm−1) and G band (1596 cm−1) from rGO.
