Anisotropic conductivity of magnetic carbon nanotubes embedded in epoxy matrices.
Anisotropic conductivity of magnetic carbon nanotubes embedded in epoxy matrices.
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DOI：
10.1016/j.carbon.2010.08.041
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发表时间：
2011-01
期刊：
影响因子：
10.9
通讯作者：
Tannenbaum, Rina
中科院分区：
文献类型：
--
作者：
Kim, Il Tae;Tannenbaum, Allen;Tannenbaum, Rina
合成了磁赤铁矿（γ-Fe 2 O3）/多壁碳纳米管（MWCNTs）杂化材料，并研究了其在磁场作用下在聚合物基体中的排列所导致的各向异性导电性能。采用溶胶-凝胶法将γ-Fe 2 O3纳米粒子固定在MWCNT表面，并加入十二烷基苯磺酸钠（NaDDBS）抑制纳米粒子在MWCNT表面形成三维氧化铁凝胶。这些混合材料，特别是磁化的多壁碳纳米管（m-MWCNT），即使在使用相对较弱的磁场时，也很容易平行于磁场方向排列。以这种方式形成的环氧树脂复合材料的导电性随着聚合物基体中m-MWCNT质量分数的增加而增加。此外，平行于磁场方向的电导率高于垂直于磁场方向的电导率，表明m-MWCNT的取向有助于增强复合材料在取向方向上的各向异性电性能。
Maghemite (γ-Fe2O3)/multi-walled carbon nanotubes (MWCNTs) hybrid-materials were synthesized and their anisotropic electrical conductivities as a result of their alignment in a polymer matrix under an external magnetic field were investigated. The tethering of γ-Fe2O3 nanoparticles on the surface of MWCNT was achieved by a modified sol-gel reaction, where sodium dodecylbenzene sulfonate (NaDDBS) was used in order to inhibit the formation of a 3D iron oxide gel. These hybrid-materials, specifically, magnetized multi-walled carbon nanotubes (m-MWCNTs) were readily aligned parallel to the direction of a magnetic field even when using a relatively weak magnetic field. The conductivity of the epoxy composites formed in this manner increased with increasing m-MWCNT mass fraction in the polymer matrix. Furthermore, the conductivities parallel to the direction of magnetic field were higher than those in the perpendicular direction, indicating that the alignment of the m-MWCNT contributed to the enhancement of the anisotropic electrical properties of the composites in the direction of alignment.
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