Synthesis and surface modification of cobalt nanoparticles and electromagnetic property of Co/PPy nanocomposites
来源期刊：Rare Metals2015年第4期
论文作者：Hai-Cheng Wang Zhi-Ran Yan Ling Deng Hua Dong Yi-He Jia Ning Ma Jun He Guang-Hua Yu
文章页码：223 - 228
摘 要：In this work, cobalt nanoparticles were synthesized by chemical reduction procedure. After the hydrophilic functionalization, Co/polypyrrole（PPy）nanocomposites were prepared by in situ polymerization of pyrrole in aqueous dispersion of Co nanoparticles. The Co/PPy nanocomposites show good electromagnetic properties with both magnetic loss and dielectric loss to electromagnetic wave. The electromagnetic wave absorbing bandwidth（reflection loss \-10 d B） for Co/PPy（20 wt%） is above 5.5 GHz at a thickness of 2 mm, and with a maximum reflection loss（around-20.02 d B） at 14.77 GHz. This magnetic nanoparticles/conducting polymer nanocomposites are great potential candidates for electromagnetic wave absorbent, because of their wide-absorbing frequency,strong absorption, good compatibility, low density, and controllable absorbing properties.
Hai-Cheng Wang1，Zhi-Ran Yan1，Ling Deng1，Hua Dong1，Yi-He Jia1，Ning Ma1，Jun He2，Guang-Hua Yu1
1. School of Materials Science and Engineering, University of Science and Technology Beijing2. Institute of Functional Materials, Central Iron & Steel Research Institute
摘 要：In this work, cobalt nanoparticles were synthesized by chemical reduction procedure. After the hydrophilic functionalization, Co/polypyrrole（PPy）nanocomposites were prepared by in situ polymerization of pyrrole in aqueous dispersion of Co nanoparticles. The Co/PPy nanocomposites show good electromagnetic properties with both magnetic loss and dielectric loss to electromagnetic wave. The electromagnetic wave absorbing bandwidth（reflection loss \-10 d B） for Co/PPy（20 wt%） is above 5.5 GHz at a thickness of 2 mm, and with a maximum reflection loss（around-20.02 d B） at 14.77 GHz. This magnetic nanoparticles/conducting polymer nanocomposites are great potential candidates for electromagnetic wave absorbent, because of their wide-absorbing frequency,strong absorption, good compatibility, low density, and controllable absorbing properties.
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