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Synthesis and Silica Coating of Nickel-Platinum Composite Nanoparticles

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Abstract:

Ni and Ni-containing nanoparticles exhibit promising magnetic properties. In a preliminary experiment, these nanoparticles aggregated after synthesis. Because nanoparticle aggregation may degrade their unique properties, a method to prevent their aggregation is required. In this study, Ni-Pt nanoparticles were synthesized and coated with silica to suppress aggregation. A colloidal solution of Ni-Pt nanoparticles was synthesized in water exposed to air using nickel(II) acetate tetrahydrate (Ni source), hexachloroplatinate(IV) hexahydrate (Pt source), sodium borohydride (reducing agent), and citric acid (stabilizer). Silica-coated Ni-Pt nanoparticles (Ni-Pt/SiO2) were synthesized by adding a tetraethylorthosilicate (TEOS)/ethanol solution to the colloidal Ni-Pt nanoparticle solution. The morphology of the Ni-Pt nanoparticles varied with reaction time. The Ni-Pt/SiO2 nanoparticles consisted of Ni-Pt cores and SiO2 shells, with their morphology dependent on the TEOS concentration. Furthermore, the Ni-Pt/SiO2 nanoparticles were more dispersed than the uncoated Ni-Pt nanoparticles, suggesting that the silica coating suppressed aggregation.

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Periodical:

Solid State Phenomena (Volume 380)

Pages:

13-21

DOI:

https://doi.org/10.4028/p-gi2Z54

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Online since:

November 2025

Authors:

Masato Yanase, Noriko Yamauchi, Shohei Tada, Yoshio Kobayashi*

Keywords:

Composite, Metal, Nanoparticles, Nickel, Platinum, Silica Coating

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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