Intriguing Plasmonic and Fluorescence Duality in Copper Nanoparticles

AbstractDendrimeric copper nanoparticles (CuNPs) were prepared by the reduction of [Cu2(CH3CO2)4] with ascorbic acid at 75  °C in the presence of ranelate ions. The metallic nanoparticles exhibited a strong plasmonic band centered at 581 nm, and their average size distribution was typically in the range of 20–30 nm. By adding polyvinylpyrrolidone to the reaction mixture, the growth of the initial copper nanopartic les was hindered. Their sizes were stabilized around 1.8 nm, leading to spherical agglomerates of about 50 nm. Upon green light excitation, the agglomerates exhibited yellow-orange fluorescence emission, keeping the surface plasmon resonance band at 581 nm. This dual behavior suggested the occurr ence of collective plasmonic resonance and efficient energy transfer within the agglomerated nanoparticles, in order to account for the observed fluorescence in the system.Graphical Abstract

Source: Plasmonics - February 27, 2020 Category: Biomedical Science Source Type: research