A gold solution was prepared using Turkevich method. In this paper, morphology of core-shell precisely control by various TiO2 volume and systematically study its influence on the plasmonic enhancement effect. To achieve maximum enhancement, the morphology of core-shell need to be optimized with coated either by insulator such as semiconductor, i.e. gold can improve the efficiency of Dye-sensitized Solar Cell by increase the light harvesting due to the strong near-field effect LSPR (Localized Surface Plasmon Resonance). These CuвЂ“SiO2 coreвЂ“shell nanoparticles with sharp and stable LSPR may greatly expand the utilization of Cu nanoparticles in aqueous environments. The observed spectra match well with the numerical simulations. For a mixture of nanocubes and nanorods, the spectra evolved to two distinct peaks during the dissembling process. During the disassembling progress, the extinction spectrum of the nanocube agglomerates evolved from a broad extinction profile to a narrow and sharp peak. It was found that the self-assembled TOP-capped Cu nanoparticles were spontaneously disassembled during the solвЂ“gel reaction, thus recovering the LSPR of individual particles.

With the TOP capping, the oxidation of the Cu cores in the microemulsion was significantly reduced, thus allowing the Cu cores to sustain the solвЂ“gel process used for coating the SiO2 protection layer. In this work, the Cu nanoparticles are successfully encapsulated in SiO2 by employing trioctyl-n-phosphine (TOP)-capped Cu nanoparticles for the solвЂ“gel reaction, yielding an aqueous CuвЂ“SiO2 coreвЂ“shell suspension with stable and well-preserved LSPR properties of the Cu cores. Copper nanoparticles exhibit intense and sharp localized surface plasmon resonance (LSPR) in the visible region however, the LSPR peaks become weak and broad when exposed to air due to the oxidation of Cu.

Copper gold core shell lspr