Journal
METALS AND MATERIALS INTERNATIONAL
Volume 23, Issue 2, Pages 405-411Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-017-6456-8
Keywords
Co superstructures; microfoliage; aggregated foliage; microwave absorption; magnetic loss; magnetic permeability
Funding
- National Research Foundation of Korea - Korean government [2016R1A2B4012847, 2013R1A4A1069528]
- Pioneer Research Center Programthrough the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2011-0027908]
- National Research Foundation of Korea [2016R1A2B4012847] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, we report on the large-scale room-temperature synthesis of Co superstructures using a facile liquid phase reduction method in an aqueous medium. This method yielded pure Co powders within a short period of time without the use of any surfactants. The morphological changes in the Co superstructures could be controlled simply by varying the amounts of reducing agent (hydrazine hydrate). The morphology of the Co powders systematically controlled from aggregated foliage to isolated microfoliage by increasing the hydrazine hydrate addition from 4 ml to 8 ml. The morphology-dependent electromagnetic properties, including the electric permittivity, and magnetic permeability, were investigated over the microwave frequency range, 2-18 GHz. Co isolated microfoliage showed a maximum reflection loss (RL) of-32 dB at 9 GHz with a matching thickness of 2.5 mm, whereas the aggregated foliage Co superstructures displayed a maximum RL of -17 dB at 11 GHz with a matching thickness of 2.5 mm. The stronger absorption for isolated microfoliage was ascribed to a continuous micro networks and vibrating microcurrent dissipation arise from size and shape of the isolated microfoliage. The calculated RL suggested that the as-prepared samples were potential microwave absorption candidates in the X-band region.
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