Pulse electrophoresis deposition of Ag@SiO₂ core-shell nanoparticles on FTO substrate

Ag@SiO₂ core-shell nanoparticles (NPs) were synthesized by chemical reduction followed by the modified Stöber method at room temperature and deposited on fluorine doped tin oxide (FTO) substrate using the pulse electrophoresis deposition (PED) method. The surface plasmon (SP) band of Ag NPs was red-shifted after silica coating. The Ag@SiO₂ core-shell NPs (50-65 nm) was composed of 25-35 nm Ag NPs core and SiO₂ shell thickness was controlled from 12 to 30 nm by controlling TEOS amount. PED was carried out in galvanostatic mode for uniform deposition of Ag@SiO₂ core-shell NPs. The number of Ag@SiO₂ core-shell NPs deposited on the substrate was increased with prolonged deposition time.