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A simple method for controlling the aggregation and oxidation of metallic zinc (Zn) nanoparticles has been developed. Metallic Zn nanoparticles were fabricated from Zn(CH₃COO) 2 ·2H 2 O by electrolysis under ultrasonic irradiation in water exposed to air. The metallic Zn nanoparticles were silica-coated by adding ethanol, a silane coupling agent (SCA)/ethanol, tetraethylorthosilicate (TEOS), and NaOH aqueous solution to the metallic Zn nanoparticle colloid solution, which perfectly prevented the metallic Zn nanoparticles from aggregating due to the physical barriers that were provided by the silica shells. (3-Mercaptopropyl)trimethoxysilane was suitable as the SCA for ensuring the nonaggregation of the silica-coated metallic Zn nanoparticles. Oxidation of the metallic Zn nanoparticles even with annealing in air was controlled by the silica shells due to their function as physical barriers.

Oxidation control of metallic zinc nanoparticles by silica coating