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(a) Raman spectra of graphene on the G/Ag/LTSi substrate; (b) SERS signals; and (c) SERS intensity at 1650 cm−1 of R6G on the Ag/LTSi and G/Ag/LTSi substrates; (d) SERS signals of R6G with different concentrations from 10−3 to 10−8 mM absorbed on the G/Ag/LTSi substrates.
