Fig. 4From: Silica Cladding of Ag Nanoparticles for High Stability and Surface-Enhanced Raman Spectroscopy PerformanceMorphology characterizations of the Ag@SiO2 nanostructures after immersing in deionized water for 0, 0.5, 1, 5, 10, 24, and 72 h and 15 days with the thickness of SiO2 is 10 nmBack to article page