The THE FORMATION OF SILVER NANOPARTICLES OLIGOMERS FABRICATED BY LASER ABLATION IN LIQUID, BY SUBSEQUENT CENTRIFUGATION AND ULTRASONIFICATION: A CONTROLLED SHIFT OF LONGITUDINAL LOCALIZED PLASMON RESONANCE FOR BIOMEDICAL APPLICATIONS

Abstract

The shape of metal nanoparticles, along with the size, determines the mechanism of their interaction with living cells. In this regard, targeted delivery of drugs and diagnostic tools requires metal nanoparticles of various shapes, the chemical synthesis of which is a much more complicated procedure than the synthesis of spherical nanoparticles. In this work, we propose a relatively simple physical method for fabricating stable oligomers of silver nanoparticles, initially obtained by pulsed laser ablation of a metal target in a liquid. Oligomers of silver nanoparticles are formed in an aqueous solution after prolonged centrifugation at 18000 g and subsequent ultrasonification of the initial colloidal solution of spherical nanoparticles obtained by laser ablation. The plasmon resonance in oligomers is shifted relative to the plasmon resonance in spherical nanoparticles to the long wavelength region by 140 nm.