Hetergeneous-nucleation synthesis of monodisperse ε-cobalt nanoparticles using palladium seeds |
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Authors: | Haitao Yang Tomoyuki Ogawa Daiji Hasegawa CN Chinnasamy Migaku Takahashi |
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Institution: | 1. Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, Aoba-yama 05, Sendai 980-8579, Japan;2. New Industry Creation Hatchery Center, Tohoku University, Aoba-yama 10, Sendai 980-8579, Japan |
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Abstract: | Monodisperse bimetallic Pd–Co nanoparticles were prepared via a thermal decomposition of cobalt carbonyl using palladium seeds at the Pd/Co molar ratios 0.5%, 1%, and 5%. The heterogeneously nucleated nanoparticles without any size-selective precipitation are sufficiently uniform to self-assemble into ordered arrays. The as-synthesized nanoparticles are each a single crystal with a complex cubic structure called ε-Co. The presence of Pd seeds seems to improve the stability of Co nanoparticles against oxidation based on the results from time-dependent magnetization measurement. |
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Keywords: | 82 60 Nh 61 46 +w 75 75 +a |
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