The paper introduces the creation of hybrid nanoparticles (NPs) comprising a silica core (Si NPs) coated with separate gold nanoparticles (Au NPs), showcasing localized surface plasmon resonance (LSPR) characteristics. The plasmonic effect observed is directly linked to the size and arrangement of the nanoparticles. Within this study, the researchers involved in the NewILUMIS project explore a broad range of sizes for the silica cores (80, 150, 400, and 600 nm) as well as for the gold NPs (8, 10, and 30 nm).

The paper offers a systematic comparison of various functionalization techniques and synthesis methods for the Au NPs, considering their optical properties and long-term colloidal stability. By establishing an optimized, robust, and dependable synthesis approach, the density and uniformity of gold in the hybrid nanoparticles are improved. The performance of these hybrid nanoparticles is assessed to determine their suitability as a dense layer for pollutant detection in gases or liquids. Additionally, they demonstrate significant potential for diverse applications as an affordable and innovative optical device.

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