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UV–Vis spectra showing the catalytic reduction of 4-nitrophenol using Au, Ag, and Au–Ag alloy NPs: (a–c) results of catalytic reduction of 4-NPh to 4-APh with Ag, Au, and Au–Ag NPs prepared using low concentrations of PE and (d–f) using Ag, Au, and Au–Ag NPs prepared using higher concentrations of PE.
