**11. Compression of silver, gold, and copper nanoparticles**

The silver, gold, and copper nanoparticles formed in the liquid solution in the spherical shape using pulsed laser ablation of plate, and they have the localized surface plasmon resonance peaks in the visible range; but the copper nanoparticle has tendency to convert copper oxide sooner than gold and silver nanoparticles. According to the literature, the gold nanoparticle was formed in the liquids faster than silver and copper nanoparticles [101]. Gold, silver, and copper nanoparticles have the different biological and medical applications. Gold nanoparticles were used as an antibiotic, anti-fungal, and anti-microbial agent. Gold nanoparticles were used for drug delivery and anti-cancer. Silver and copper nanoparticles are a strong anti-bacterial and anti-inflammatory. Gold and silver nanoparticles were used as optical probes, sensor, and catalyst.
