物理化学学报 >> 2006, Vol. 22 >> Issue (03): 296-300.doi: 10.3866/PKU.WHXB20060308

研究论文 上一篇    下一篇

不同结构碳纳米管的电磁波吸收性能研究

张增富; 罗国华; 范壮军; 项荣; 周丽; 魏飞   

  1. 清华大学化工系, 北京市绿色反应工程与工艺重点实验室, 北京 100084
  • 收稿日期:2005-09-01 修回日期:2005-10-17 发布日期:2006-03-10
  • 通讯作者: 罗国华 E-mail:luoguoh@flotu.org

Complex Permittivity and Permeability Spectra of Different Kinds of Carbon Nanotubes

ZHANG Zeng-Fu; LUO Guo-Hua; FAN Zhuang-Jun; XIANG Rong; ZHOU Li; WEI Fei   

  1. Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China
  • Received:2005-09-01 Revised:2005-10-17 Published:2006-03-10
  • Contact: LUO Guo-Hua E-mail:luoguoh@flotu.org

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摘要： 研究了单壁、多壁碳纳米管(聚团状、阵列状)以及未纯化与纯化后碳纳米管在2～18 GHz范围内的电磁波吸收性能. 通过测定不同结构碳纳米管粉体的介电常数以及磁导率, 得到损耗因子及衰减常数大小顺序为: 阵列状多壁碳纳米管>原生聚团状多壁碳纳米管>纯化聚团状多壁碳纳米管>原生单壁碳纳米管>纯化后单壁碳纳米管. 相比多壁碳纳米管, 单壁碳纳米管衰减常数随频率变化较小, 且具有较宽的吸收峰. 模拟计算和实验测试结果都表明, 碳纳米管/聚合物复合材料具有优良的电磁吸波性能.

关键词: 单壁碳纳米管, 多壁碳纳米管, 电磁波吸收

Abstract: Carbon nanotubes (CNTs), with well defined one-dimension nanoscale tubular structure, have potential applications for elctromagnetic wave absorption. The complex permittivity and permeability spectra of different kinds of CNTs were measured in the range from 2 GHz to 18 GHz. The coefficient of attenuation, impedance and loss tangents of different kinds of carbon nanotube composites were compared. The order of loss tangents is as follows: aligned multi-walled CNTs > raw tangled multi-walled CNTs > purified tangled multi-walled CNTs > raw tangled single-walled CNTs > purified tangled single-walled CNTs. The reflectivities of different kinds of carbon nanotube composites were calculated. Compared with multi-walled CNTs, single-walled CNTs have wider absorption capability. Both experimental and calculated results indicated that CNTs as filler in nano-composite materials have excellent elctromagenetic wave absorption properties.

Key words: Single-walled carbon nanotubes, Multi-walled carbon nanotubes, Electromagnetic wave absorption