| Complex conductivity and permittivity of single wall carbon nanotubes/polymer composite at microwave frequencies:A theoretical estimation |
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| 基金项目： | Supported by the Science Research Program of Educational Department of Hunan Province of China (Grant No. 07C640) and the Doctor Foundation of China (Grant No. 20030532008) |
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| 摘 要： | Based on an equivalent resistance-capacitance network, the complex conductivity and the relative complex permittivity of single wall carbon nanotubes （SWNTs）/polymer composite are theoretically investigated in the frequency range of 0.30-18 GHz using the logarithmic rule. Both the real and imaginary parts of the permittivities of SWNTs and polymer are considered in detail. The calculated complex permittivity spectra of SWNTs/poly（ethyl methacrylate） composite films are in good agreement with the available experimental data. The influences of SWNTs concentration on both the complex conductivity and the dielectric loss tangent of the composite are presented in the microwave frequency range. A linear relationship between microwave conductivity and frequency is found.
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| 关 键 词： | 纳米管 复合材料 微波 络合物传导性 电容率 |
| 收稿时间： | 2008-06-06 |
| 修稿时间： | 2008-08-08 |
Complex conductivity and permittivity of single wall carbon nanotubes/polymer composite at microwave frequencies: A theoretical estimation |
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| Authors: | ZhiHua Peng JingCui Peng YanFeng Peng JieYang Wang |
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| Institution: | (1) School of Physics and Microelectronics Science, Hunan University, Changsha, 410082, China;(2) School of Mathematics and Physics, University of South China, Hengyang, 421001, China;(3) College of Physics and Information Science, Hunan Normal University, Changsha, 410081, China |
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| Abstract: | Based on an equivalent resistance-capacitance network, the complex conductivity and the relative complex permittivity of single wall carbon nanotubes (SWNTs)/polymer composite are theoretically investigated in the frequency range of 0.30-18 GHz using the logarithmic rule. Both the real and imaginary parts of the permittivities of SWNTs and polymer are considered in detail. The calculated complex permittivity spectra of SWNTs/poly(ethyl methacrylate) composite films are in good agreement with the available experimental data. The influences of SWNTs concentration on both the complex conductivity and the dielectric loss tangent of the composite are presented in the microwave frequency range. A linear relationship between microwave conductivity and frequency is found. |
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| Keywords: | single wall carbon nanotubes composite microwave complex conductivity complex permittivity |
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