Fig. 1From: Silica Cladding of Ag Nanoparticles for High Stability and Surface-Enhanced Raman Spectroscopy PerformanceMorphology characterizations of the Ag nanoparticle films coated with different thickness of SiO2 layers: a 0 nm; b 5 nm; c 10 nm; d 20 nm; e 50 nm; f 100 nm; g variation of nanoparticle diameter as the increase of SiO2 thickness; and h variation of the distance between Ag NPs as the increase of SiO2 thicknessBack to article page