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Updated: Sep 24, 2025
Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
Published on: March 2, 2016
One-pot one-step synthesis of Au@SiO2 core-shell nanoparticles and their shell-thickness-dependent fluorescent
Shan Zhang1, Xiaochuan Xu1, Guoyu Zhang1
1Key Laboratory of Synthetic and Natural Functional Molecule Chemistry (Ministry of Education), Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University Xi'an 710069 P. R. China jianhui@nwu.edu.cn +86-29-81535026 +86-29-81535026.
Abstract:
Herein, we report a one-pot one-step method for the preparation of Au@SiO2 core-shell nanoparticles (NPs) via a facile heating treatment of an alcoholic-aqueous solution of chloroauric acid (HAuCl4), 2-methylaminoethanol (2-MAE), cetyltrimethylammonimum bromide (CTAB), and tetraethylorthosilicate (TEOS). The size of the Au core and the thickness of the silica shell can be easily controlled by simply adjusting the volume of HAuCl4 and TEOS, respectively, which can hardly be achieved by other approaches. The as-prepared Au@SiO2 core-shell NPs exhibited shell-thickness-dependent fluorescent properties. The optimum fluorescence enhancement of fluorescein isothiocyanate (FITC) was found to occur at a silica shell thickness of 34 nm with an enhancement factor of 5.0. This work provides a new approach for the preparation of Au@SiO2 core-shell NPs and promotes their potential applications in ultrasensitive analyte detection, theranostics, catalysts and thin-film solar cells.
