Effective synergistic effect of Al2O3 and SiC microparticles on the growth of carbon nanotubes and their application in high dielectric permittivity polymer composites
Effective synergistic effect of Al2O3 and SiC microparticles on the growth of carbon nanotubes and their application in high dielectric permittivity polymer composites
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DOI：
10.1039/c4ta00369a
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发表时间：
2014-01-01
影响因子：
11.9
通讯作者：
Bai, Jinbo
中科院分区：
文献类型：
--
作者：
Dichiara, Anthony B.;Yuan, Jinkai;Bai, Jinbo
碳纳米管因其优异的固有性能而被广泛用于增强聚合物复合材料。然而，碳纳米管聚集，差的CNT/基体纳米级界面和增加的粘度是令人困惑的问题，限制了碳纳米管在聚合物复合材料中的应用。实现高分散状态的潜在解决方案依赖于微米/纳米级结构的概念。以前的研究已经报道了新一代的复合材料的基础上的碳纳米管与陶瓷微粒的杂交，提供了出色的性能时，用作聚合物复合材料中的填料。然而，仍然存在机会，以改善这些复合材料的性能，进一步通过混合不同类型的CNT-陶瓷杂化物在适当调整的比例。本工作的重点是在不同的氧化铝微球和碳化硅微片的混合物的浮动催化剂化学气相沉积（CVD）的碳纳米管的生长。不仅与合成的混合混合物制备的聚（偏二氟乙烯）复合材料表现出显着改善的介电性能比那些单独与任何一个组件增强，而且CVD过程产生异常高的CNT质量产率时，这两种类型的陶瓷颗粒同时用作基板的增长。有关的CNT的生长和聚合物复合材料的介电行为的基本机制进行了彻底的调查和讨论。
Owing to their excellent intrinsic properties, carbon nanotubes (CNTs) have been widely used to reinforce polymer composites. However, CNT aggregation, the poor CNT/matrix nanoscale interface and increased viscosity are perplexing issues limiting the applications of CNTs in polymer composites. A potential solution to achieve high dispersion states relies upon the concept of micro/nanoscale structures. Previous studies have reported a new generation of composites based on the hybridization of CNTs with ceramic microparticles, providing outstanding properties when used as fillers in polymer composites. Nevertheless, opportunities still exist to improve the performances of these composites further by mixing different types of CNT-ceramic hybrids in properly adjusted proportions. This work focuses on the growth of CNTs on different mixtures of alumina microspheres and silicon carbide microplatelets by floating-catalyst chemical vapor deposition (CVD). Not only do the poly(vinylidene fluoride) composites prepared with the as-synthesized hybrid mixtures exhibit significant improvement of the dielectric properties than those reinforced with either component alone, but also the CVD process yields an abnormally high CNT mass yield when the two types of ceramic particles are simultaneously used as a substrate for the growth. The underlying mechanisms regarding both the CNT growth and the dielectric behaviour of the polymer composites were thoroughly investigated and discussed.