A novel self-assembled hybrid nanocompound consisting of bismuth sulfide nanocrystals (BiS NCs) and Ag@SiO nanoparticles (NPs) is used to study the enhancement of photoluminescence by localized surface plasmon resonance (LSPR). Ag@SiO 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 BiS NCs. We propose the photoluminescence enhancement by the LSPR effect through adjusting the thickness of silica shell and the Ag@SiO 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 SiO shell at 22.5 nm. A clear red shift of the emission peaks in the BiS NCs-Ag@SiO NPs hybrid structures is observed. Such a metal-enhanced BiS quantum dot (QD) fluorescence system may have promising applications in optoelectronic device.
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