Dielectric behavior of ultrahigh-k carbon black composites for embedded capacitor applications
Dielectric behavior of ultrahigh-k carbon black composites for embedded capacitor applications
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DOI：
10.1109/ectc.2005.1442051
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发表时间：
2005-06
期刊：
影响因子：
--
通讯作者：
Jianwen Xu;C. Wong
中科院分区：
文献类型：
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作者：
Jianwen Xu;C. Wong
聚合物基纳米复合材料由于其低成本和与有机基片制造工艺的良好兼容性而成为埋入式电容器介质材料的研究热点。已被研究的聚合物纳米复合材料之一是炭黑/聚合物复合材料，它可以提供1000以上的高介电常数。本文系统地研究和分析了炭黑CBCA6/环氧复合材料的介电行为。结果表明，在合适的填充量下，该复合材料的介电常数始终保持在1,000以上，但该炭黑复合材料的损耗因子较高(TAM/SPL Delta/&gT；L)。此外，在10 MHz的中频范围内观察到介电常数和介电损耗随频率的变化。炭黑是一种纳米结构材料，具有较大的比表面积和基于其表面化学、颗粒大小和聚集体结构的广泛的电学性质，而聚合物-炭黑界面被认为是导致高损耗和高频依赖性的重要因素。因此，为获得低损耗超高k炭黑复合材料，本研究对界面及其添加剂改性进行了基础性研究。为了改善炭黑-聚合物界面，降低炭黑复合材料的高电导介电损耗，在炭黑-聚合物配方中加入了高击穿场强的无机填料--气相白炭黑。结果表明，炭黑复合材料的介电损耗随着气相二氧化硅夹杂物的增加而降低。还发现气相白炭黑显著改变了炭黑复合材料的频率依赖行为。
Polymer based nanocomposites have been of great interest as embedded capacitor dielectrics because of their low cost and excellent compatibility with the organic substrate manufacturing processes. One of the polymer nanocomposites that have been studied is the carbon black/polymer composite, which could give a high dielectric constant over 1,000. In this paper, the dielectric behavior of carbon black CBCA6/epoxy composite was systematically investigated and analyzed. It was found that this composite consistently showed a high dielectric constant of over 1,000 at the proper filler loading levels, however, the dissipation factor of this carbon black composite was high (tan/spl delta/>l). Moreover, frequency dependence of the dielectric constant and dielectric loss were observed in the middle frequency range up to 10 MHz. Carbon black is a nano structured material which has a large surface area and a wide range of electrical properties based on its surface chemistry, particle size and aggregate structure, and the polymer-carbon black interfaces are believed to contribute significantly to the high loss and high frequency dependence. Therefore, fundamental studies of the interface and its modification with additives were conducted in this research in order to obtain low-loss ultrahigh-k carbon black composites. A high breakdown field inorganic filler, i.e. fumed silica, was included to the carbon black-polymer formulation in order to modify the carbon black-polymer interfaces and reduce the high conduction dielectric losses of carbon black composites. It was found that the dielectric loss of carbon black composites decreased with the fumed silica inclusion. The fumed silica was also found to significantly change the frequency dependence behavior of carbon black composites.