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UV-vis spectra of 4-nitrophenol reduction as function of time and chemical reaction kinetics determination, respectively for (a,c) AuNPs and (b,d) AgNPs (pH = 10; T = 35 °C; 5 µg of metal; 10 μL of 4-nitrophenol at 1 × 10−2 µmol/L and 50 μL of NaBH4 at 0.4 µmol/L).
