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Raman spectra of different SERS substrates and Au nanoparticles with different surface modifications. (a–d) Au and Ag nanoparticles and Au-Ag composite on a glass slide. (e–h) Au and Ag nanoparticles and Au-Ag composite on a gold-coated glass slide. (i–l) Surface modifications of Au nanoparticles using DNA and Raman tags on a gold-coated glass slide.
