| 纳米镍-铁合金/膨胀石墨复合材料的制备、表征及其电磁屏蔽性能 |
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| 引用本文： | 刘兰香,黄玉安,黄润生,唐 涛,徐 铮,葛 欣,沈俭一.纳米镍-铁合金/膨胀石墨复合材料的制备、表征及其电磁屏蔽性能[J].无机化学学报,2007,23(9):1667-1670. |
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| 作者姓名： | 刘兰香 黄玉安 黄润生 唐 涛 徐 铮 葛 欣 沈俭一 |
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| 作者单位： | 1. 南京大学化学化工学院,南京,210093
2. 南京大学物理系,南京,210093 |
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| 基金项目： | 江苏省科学厅高科技项目;国家高技术研究发展计划(863计划);国家自然科学基金 |
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| 摘 要： | The composites with nano-particles of Ni-Fe alloys dispersed on the nano-layers of expanded graphite (EG) were prepared by the impregnation of EG with ethanol solutions of nickel and iron acetates， followed by drying and reduction in H2. The square nano-particles of Ni-Fe alloys with particle sizes of mainly 20～40 nm were found to be well spread on the layers of EG. The alloy nano-particles exhibited high shielding effectiveness (SE) for electromagnetic radiations at low frequencies due to their high magnetic conductivity. Since EG is electronically conductive and displayed high SE at high frequencies， the composites exhibited good SE at wide range of frequencies. The electric and magnetic conductivities of the composites could be monitored through regulating the loadings of alloy nano-particles on EG， and it was found that the composites with 20%～40% of the alloys exhibited good SE. Specifically， the composite 27%Ni-3%Fe-EG showed the excellent SE from 66 to 110 dB at the frequencies from 300 kHz to 1.5 GHz.
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| 关 键 词： | 膨胀石墨 金属纳米颗粒 铁镍合金 电磁屏蔽 |
| 文章编号： | 1001-4861（2007）09-1667-04 |
| 修稿时间： | 2007-04-28 |
Preparation and Characterization of the Nano-particles Composites of Ni-Fe Alloys Dispersed on Expanded Graphite for the Shielding of Electromagnetic Radiations |
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| LIU Lan-Xiang,HUANG Yu-An,HUANG Run-Sheng,TANG Tao,XU Zheng,GE Xin and SHEN Jian-Yi.Preparation and Characterization of the Nano-particles Composites of Ni-Fe Alloys Dispersed on Expanded Graphite for the Shielding of Electromagnetic Radiations[J].Chinese Journal of Inorganic Chemistry,2007,23(9):1667-1670. |
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| Authors: | LIU Lan-Xiang HUANG Yu-An HUANG Run-Sheng TANG Tao XU Zheng GE Xin and SHEN Jian-Yi |
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| Affiliation: | 1.School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093;2.Department of Physics, Nanjing University, Nanjing 210093 |
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| Abstract: | The composites with nano-particles of Ni-Fe alloys dispersed on the nano-layers of expanded graphite (EG) were prepared by the impregnation of EG with ethanol solutions of nickel and iron acetates, followed by drying and reduction in H2. The square nano-particles of Ni-Fe alloys with particle sizes of mainly 20~40 nm were found to be well spread on the layers of EG. The alloy nano-particles exhibited high shielding effectiveness (SE) for electromagnetic radiations at low frequencies due to their high magnetic conductivity. Since EG is electronically conductive and displayed high SE at high frequencies, the composites exhibited good SE at wide range of frequencies. The electric and magnetic conductivities of the composites could be monitored through regulating the loadings of alloy nano-particles on EG, and it was found that the composites with 20%~40% of the alloys exhibited good SE. Specifically, the composite 27%Ni-3?-EG showed the excellent SE from 66 to 110 dB at the frequencies from 300 kHz to 1.5 GHz. |
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| Keywords: | expanded graphite metallic nano-particle Ni-Fe alloy shielding effectiveness |
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