Spectral manifestations of the exciton-plasmon interaction of Ag2S quantum dots with silver and gold nanoparticles

Abstract

The purpose of our study was to develop methods for creating hybrid nanostructures based on colloidal Ag2S quantum dots, pyramidal silver nanoparticles, Au nanorods, and to determine the spectral-luminescent manifestations of exciton-plasmon interactions in these structures. The objects of the study were Ag2S quantum dots passivated with thioglycolic acid (Ag2S/TGA QDs) and 2-mercaptopropionic acid (Ag2S/2-MPA QDs), gold nanorods (Au NRs), silver nanoparticles with pyramidal geometry (Ag NPs), and their mixtures. The spectral properties were studied using a USB2000+ with a PMC-100-20 photomultiplier system (Becker & Hickl Germany). The article considers the transformation of the luminescence spectra of colloidal Ag2S/TGA QDs and Ag2S/2-MPA QDs in mixtures with pyramidal Ag NPs and Au NRs. The study demonstrated the presence of the effects of the contour transformation of the luminescence spectra due to the Fano effect, as well as the luminescence quenching following direct contact between QDs and NPs

Keywords

• silver and gold nanoparticles
• silver sulfide quantum dots
• hybrid nanostructures
• luminescence spectrum