期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 2, 页码 1793-1800出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12786
关键词
high-k material; negative permittivity; metamaterial; dielectric property; multilayer composite
资金
- National Natural Science Foundation of China [51402271]
- Foundation for Outstanding Young Scientist in Shandong Province [BS2014CL003]
- Qingdao Science and Technology Plan [14-2-4-118-jch]
- Fundamental Research Funds for the Central Universities [201413001]
- Shandong and Qingdao Postdoctoral Science Foundation
Polymer matrix high-k composites are of considerable interest in various electronic devices, such as capacitors, antennas, actuators, etc. However, how to enhance the permittivity without elevating the loss remains a challenge for us. Here we present a novel design of bilayer high-k metacomposites consisting of two stacked single layers with positive permittivity and negative permittivity. Interestingly, the bilayer system shows an obvious permittivity boost effect with a permittivity improved by a 40-fold increase compared with the polymer matrix, while maintaining a loss tangent as low as 0.06. Further calculation results indicate that the permittivity of the bilayer composites could be enhanced by 4000-fold or even a greater increase as compared with the polymer matrix via balancing the dielectric properties of single layers. Insights into how the thickness ratios and dielectric properties of single layers interfere with the dielectric performances of bilayer composites were discussed. This study provides a new route for the design of high-k materials, and it will have great significance on the development of dielectric materials. Hopefully, multilayer high-k metacomposites with fascinating dielectric performances could be achieved via balancing the dielectric properties of single layers.
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