Abstract. The synthesis of some silver nanoparticles was carried out by twostep reduction, with chemical or biological antioxidants, and subsequent exposure to ultraviolet radiation. Synthesis efficiency was progressively increased after 30 min during second step: about 40% increase of LSPR band intensity for chemical reducing and more than 100% enhancing for biological reducing.

Key words: Silver reducing, electro-optical features, eco-friendly approach.