Nano-scale and micron-scale manganese dioxide vs corresponding paraffin composites for electromagnetic interference shielding and microwave absorption

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• 作者：Wei-Li Song ; Mao-Sheng Cao ; Bei-Bei Qiao ; Zhi-Ling Hou ; Ming-Ming Lu ; Chan-Yuan Wang ; Jie Yuan ; Dong-Ni Liu ; Li-Zhen Fan
• 关键词：A. Composites ; A. Oxides ; A. Nanostructures ; D. Dielectric properties ; D. Electrical properties
• 刊名：Materials Research Bulletin
• 出版年：March, 2014
• 年：2014
• 卷：51
• 期：Complete
• 页码：277-286
• 全文大小：3105 K

文摘

The hydrothermal method was utilized to synthesize beta-manganese dioxide (尾-MnO₂) nanorods. Both the neat bulk samples fabricated from the nano-scale 尾-MnO₂ rods and commercial micron-scale 尾-MnO₂ particles exhibited similar performance in permittivity, electromagnetic interference shielding and microwave absorption. The wax-based composites embedded with the as-prepared 尾-MnO₂ nanorods exhibited greater differences in permittivity, electromagnetic interference shielding and microwave absorption, compared to those embedded with the commercial micron-scale MnO₂ particles. The results suggest that neat MnO₂ materials are effective in electromagnetic interference shielding and the composites with 尾-MnO₂ nanorods present the highest microwave absorption. Electrical conductivity coupled with size effects was considered as the most significant roles in the variations of permittivity, electromagnetic interference shielding and microwave absorption. The related mechanism associated with reflection and absorption has been discussed. The results have provided potential strategies for designing and achieving high-performance electromagnetic interference shielding and microwave absorbing materials.