Micro-structural and Interfacial Effects on the Dielectric Properties of High-k Aluminum/Epozy Composites for Embedded Capacitors
Electrically percolative composites have attracted much attention because they exhibit a high dielectric constant at a critical concentration of the conductive fillers. Aluminum (Al) is well known as a fast self-passivation and low-density metal. The thin and dense passivation layer forms an insulating boundary layer outside the metallic spheres (coreshell) which lowers the dielectric loss and realizes high filler loading levels. In this article, the influences of the content of Al, the size of Al core, the thickness of Al2O3 shell, and the two interfaces of polymer-Al2O3 and Al2O3-Al on the dielectric behaviors of the resulting percolative composites have been systematically analyzed and interpreted. For the composite containing 70 vol.％ of 1.0 μm aluminum, a dielectric constant of 95.49 and a low dielectric loss of about 0.05 over a frequency range of 100Hz~10MHz was achieved. The broad peak over a wide volume fraction range of the percolation threshold concentration makes the material reproducible for use.
Chong Chen Shuhui Yu Rong Sun Suibin Luo Lvqian Weng Ruxu Du
Shenzhen Institute of Advanced Technology, Shenzhen, Guangdong, China, 518055 Harbin Institute of Te Shenzhen Institute of Advanced Technology, Shenzhen, Guangdong, China, 518055 Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, Guangdong, China, 518055
国际会议
北京
英文
589-592
2009-08-10（万方平台首次上网日期，不代表论文的发表时间）