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Table 1 The mean sizes of the AgNPs in the double-layer Ag films prepared in 5/2.5 mM AgNO3/BuNH2 solution at different reaction times of 1.5-40 h

From: Fabrication and evolution of multilayer silver nanofilms for surface-enhanced Raman scattering sensing of arsenate

Reaction time (h) Size of AgNPs (nm)
  1st-layer 2nd-layer
1.5 20 ± 5 /
2 35 ± 10 /
5 40 ± 8 60 ± 15
18 35 ± 12 80 ± 20
25 45 ± 10 150 ± 30
40 50 ± 10 180 ± 30
  1. The mean sizes were obtained by averaging the diameters of 15-50 particles in each layer