碳管功能基元序构的自支撑三维网格膜及其高性能滤波电容器

随着电子产品向小型便携式发展，急需小尺寸的高容量滤波电容器。但目前滤波电路使用的却是低容量、大体积的铝电解电容器，严重制约了器件的小型化。本项目对含杂质的铝片采用“自上而下”的阳极氧化与选择性腐蚀相结合，获得相互联通的三维有序多孔氧化铝模板。继而采用“自下而上”的化学气相沉积方法，将“碳管功能基元”“序构”到模板的孔中，获得由横向碳管通过化学键联接纵向碳管阵列组成的自支撑三维碳管网格膜，以及在碳管内充填更细直径碳管的自支撑三维碳管网格膜等新结构。这些新颖的三维碳管网格膜的结构稳定、导电性好、比表面大、网格开放。用其构建的小尺寸双电层电容器，不仅能避免碳管之间的相互团聚，提供快速的离子扩散通道与高的频率响应，而且电极电阻小、面比电容大，有望在高频率下获得高功率性能与高能量密度，这种高性能微型滤波电容器在能量存储与滤波电路中有广泛应用前景，对储能设备的便携化与器件的微型化具有重要的意义。

The filter capacitors play a critical role in ensuring the quality and reliability of electrical and electronic equipment. The aluminum electrolytic capacitors are the dominant type of filter capacitors but with low areal capacitance, making them always the largest component of the filtering circuits that limits further device miniaturization. The high areal capacitance nature of electric double-layer capacitors should make them ideal miniaturized filter capacitors, however, hindered by their slow frequency responses. In this study, firstly we’ll develop a new type of three-dimensional (3D) porous anodic aluminum oxide (AAO) template by a “top-down” method of anodizing impure aluminum foils and selective wet-chemical etching the impurity nanoparticles embedded in the wall of porous AAO template, and then grow carbon tubes inside the 3D porous AAO template by a “bottom-up” method of template-assistant chemical vapor deposition, to achieve truly-interconnected and structurally-integrated 3D carbon tube grids that have never been seen before, next by using our free-standing 3D carbon tube grids as two symmetrical electrodes we’ll build a much smaller-sized electric double-layer capacitor. As our new structurally-integrated 3D carbon tube grids enable the high structural stability, superior electrical conductivity and efficient ion transport channels, so the resultant electric double-layer capacitors have high areal capacitance, rapid frequency response and excellent line filtering performance, which are impeccable for miniaturizing filter capacitors. As such, this study will provide a sound technological basis to develop new generation electric double-layer capacitors for miniature power devices.