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Scanning electron microscope-image planar views of gold nanostructures grown into porous SiO2/Si matrix observed at different gold deposition times: (a) general planar overview of the surface at deposition time of 30 s; (b) 1 s, (c) 5 s, (d) 15 s, (e) 30 s, (f) 60 s, (g) 180 s, (h) 1800 s. (b−h) insets: zoomed view of single pores filled with gold agglomerates.
