Fig. 4From: Formation Regularities of Plasmonic Silver Nanostructures on Porous Silicon for Effective Surface-Enhanced Raman ScatteringSEM top views of the PS samples after the immersion into 10 mM AgNO3 solution. Ag was deposited for a 15, b 120, and c 180 min. Below corresponding histograms of Ag NPs size distribution are presented. The histograms are normalized with respect to the total number of Ag NPsBack to article page