Abstract

A novel self-assembled hybrid nanocompound consisting of bismuth sulfide nanocrystals (${\mathrm{Bi}}_2{\mathrm{S}}_3$ NCs) and $\mathrm{Ag}@{\mathrm{SiO}}_2$ nanoparticles (NPs) is used to study the enhancement of photoluminescence by localized surface plasmon resonance (LSPR). $\mathrm{Ag}@{\mathrm{SiO}}_2$ core-shell NPs were prepared by deposition of silica onto the surface of Ag NPs through the sol–gel method and followed by surface modification via 3-aminopropyltriethoxysilane for the coming conjugation with ${\mathrm{Bi}}_2{\mathrm{S}}_3$ NCs. We propose the photoluminescence enhancement by the LSPR effect through adjusting the thickness of silica shell and the $\mathrm{Ag}@{\mathrm{SiO}}_2$ NP concentration. By modulating the thickness of the silica shell and the concentration of Ag NPs, the maximum enhancement of a 5.7 fold can be reached with the thickness of an ${\mathrm{SiO}}_2$ shell at 22.5 nm. A clear red shift of the emission peaks in the ${\mathrm{Bi}}_2{\mathrm{S}}_3$ NCs-$\mathrm{Ag}@{\mathrm{SiO}}_2$ NPs hybrid structures is observed. Such a metal-enhanced ${\mathrm{Bi}}_2{\mathrm{S}}_3$ quantum dot (QD) fluorescence system may have promising applications in optoelectronic device.

© 2016 Optical Society of America

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