Synthesis and characterizations of core-shell SiO2/Au/Ag nano-particles by exploding of wire and pulsed laser plasmas

The electrical explosion wire (EEW) method was used to fabricate core- shell SiO2 /Ag/Au Nanoparticles (NPs). Also the laser ablation technique was used to improve the covering of the core shell of the particles. The effects of the experimental parameters such as the exploded current and laser energy on the synthesized core-shell (SiO2/Ag/Au) NPs was studied. The core-shell SiO2 /Ag/Au Nano-particles were characterized by X-ray diffraction pattern (XRD), The X-ray data expose the formation of prepared NPs. The surface Plasmon resonance (SPR) of fabricated Nano-particles was investigate by UV-Vis-NIR spectroscopy. The results show that the position of the SPR band of the NPs agrees with preceding research, which could be controlled by the variation of exploded current. The transmission electron microscopy (TEM) images show that the SiO2 particles were decorated by silver and gold nanoparticle. All the results confirmed that the SiO2 Nano- particles were ornamented with silver and gold, then the ornament was become a full (Ag/Au alloy) shell covering these Nano-particles when laser technique was used to treat them.