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. 2015 Jul 28;5:12555. doi: 10.1038/srep12555

Figure 3. Fabrication of Ag-SiO2 nanostructures.

Figure 3

Ag NPs are annealed at 800 °C for all the samples (a) Extinction spectra of Ag NPs with different SiO2 thicknesses beneath the nanoparticles, ranging from 0 nm to 20 nm. (b) Extinction spectra of Ag sandwich structures with 10 nm of SiO2 beneath the Ag NPs and various thicknesses of SiO2 overcoating the NPs, ranging from 5 nm to 20 nm. (c–f) Morphologies of sandwiched Ag nanoparticles cladding with different SiO2 thicknesses of (c) 5 nm, (d) 10 nm, (e) 15 nm, and (f) 20 nm.