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Raman spectroscopy and surface-enhanced Raman spectroscopy. 5-Fluorouracil solution and blank Ag film (a) (the inset shows the detail near 3,100 cm−1 with enlarged scale) and different concentrations (b) 1 × 10−2, (c) 1 × 10−3, (d) 1 × 10−4, (e) 1 × 10−5, and (f) 1 × 10−6. In (b to f), the solid curve is the Raman spectroscopy of 5-fluorouracil solution on silver nanoparticle film, and the dash curve is the Raman spectroscopy of 5-fluorouracil solution on silica substrate.
