Ferroferric Oxide/Multiwalled Carbon Nanotube vs Polyaniline/Ferroferric Oxide/Multiwalled Carbon Nanotube Multiheterostructures for Highly Effective Microwave Absorption
Ferroferric Oxide/Multiwalled Carbon Nanotube vs Polyaniline/Ferroferric Oxide/Multiwalled Carbon Nanotube Multiheterostructures for Highly Effective Microwave Absorption
复制标题
四氧化三铁/多壁碳纳米管与聚苯胺/四氧化三铁/多壁碳纳米管多异质结构的高效微波吸收
DOI：
10.1021/am3021069
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发表时间：
2012-12-01
影响因子：
9.5
通讯作者：
Yuan, Jie
中科院分区：
文献类型：
--
作者：
Cao, Mao-Sheng;Yang, Jian;Yuan, Jie
碳纳米管（CNTs）填充的轻质纳米复合材料在电磁屏蔽和衰减方面具有巨大的潜力，在电子、通信设备以及飞机和车辆的特定部件中具有广泛的应用。具体而言，由于介电损耗或磁损耗的增强，将第二相引入CNT中/上以实现基于CNT的异质结构已被广泛追求。在这项工作中，四氧化三铁（Fe 3 O 4）被选为相的多壁碳纳米管（MWCNT）为基础的复合材料，以提高磁性能，以获得改善的电磁衰减。将两相异质结构（Fe 3 O 4/MWCNTs）与聚苯胺（PANI）包覆的Fe 3 O 4/MWCNTs，即三相异质结构（PANI/Fe 3 O 4/MWCNTs）进行了直接对比，分别研究了Fe 3 O 4和PANI的界面作用对复介电常数和复磁导率的影响。与PANI/Fe 3 O 4/MWCNTs相比，Fe 3 O 4/MWCNTs具有更好的磁性能和更高的介电性能。多壁碳纳米管和异质结构之间的界面被发现在相应的性能中发挥作用。对它们的蜡基复合材料的微波吸收性能进行了评价，并对Fe 3 O 4/MWCNTs和PANI/Fe 3 O 4/MWCNTs在高效微波吸收和有效吸收带宽方面进行了比较。
Light-weight nanocomposites filled with carbon nanotubes (CNTs) are developed for their significant potentials in electromagnetic shielding and attenuation for wide applications in electronics, communication devices, and specific parts in aircrafts and vehicles. Specifically, the introduction of a second phase into/onto CNTs for achieving CNT-based heterostructures has been widely pursued due to the enhancement in either dielectric loss or magnetic loss. In this work, ferroferric oxide (Fe3O4) was selected as the phase in multiwalled carbon nanotube (MWCNT)-based composites for enhancing magnetic properties to obtain improved electromagnetic attenuation. A direct comparison between the two-phase heterostructures (Fe3O4/MWCNTs) and polyaniline (PANI) coated Fe3O4/MWCNTs, namely, three-phase heterostructures (PANI/Fe3O4/MWCNTs), was made to investigate the interface influences of Fe3O4 and PANI on the complex permittivity and permeability separately. Compared to PANI/Fe3O4/MWCNTs, Fe3O4/MWCNTs exhibited enhanced magnetic properties coupled with increased dielectric properties. Interfaces between MWCNTs and heterostructures were found to play a role in the corresponding properties. The evaluation of microwave absorption of their wax composites was carried out, and the comparison between Fe3O4/MWCNTs and PANI/Fe3O4/MWCNTs with respect to highly efficient microwave absorption and effective absorption bandwidth was discussed.