Charge transport properties of composites of multiwalled carbon nanotube with metal catalyst and polymer: application to electromagnetic interference shielding
Charge transport properties of composites of multiwalled carbon nanotube with metal catalyst and polymer: application to electromagnetic interference shielding
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DOI：
10.1016/j.cap.2004.01.022
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发表时间：
2004-11-01
影响因子：
2.4
通讯作者：
Lee, CJ
中科院分区：
文献类型：
--
作者：
Kim, HM;Kim, K;Lee, CJ
我们报告电荷传输特性，例如直流电。聚甲基丙烯酸甲酯 (PMMA) 和多壁碳纳米管 (MWCNT) 复合材料的电导率 (sigma(DC)) 及其温度依赖性。以 Fe 或 Co 为催化剂，通过化学气相沉积法合成了多壁碳纳米管。通过超声处理将多壁碳纳米管均匀分散在PMMA基体中，制备多壁碳纳米管-PMMA复合薄膜。我们控制了复合材料中MWCNT的质量浓度，MWCNT-PMMA复合膜的厚度为20-100μm。使用扫描电子显微镜、透射电子显微镜、X射线衍射和拉曼光谱研究复合材料的结构和均匀性。 MWCNT-PMMA复合材料在室温下的sDC随着MWCNT质量浓度的增加而增加，这遵循逾渗理论。在50 MHz-3.5 GHz频率范围内测量了MWCNT-PMMA复合材料的电磁干扰（EMI）屏蔽效率（SE）。我们观察到 MWCNT-PMMA 复合材料的 EMI SE 随着 MWCNT 浓度的增加而增加。 (C) 2004 Elsevier B.V. 保留所有权利。
We report charge transport properties such as d.c. conductivity (sigma(DC)) and its temperature dependence for composites of poly(methyl methacrylate) (PMMA) and multiwalled carbon nanotubes (MWCNTs). The MWCNTs were synthesized through chemical vapor deposition with Fe or Co as catalyst. The MWCNTs were homogeneously dispersed in PMMA matrix through sonication to prepare MWCNT-PMMA composite films. We controlled mass concentration of MWCNTs in the composites, and the thickness of MWCNT-PMMA composite films was 20-100 mum. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman spectroscopy were used to study structure and homogeneity of the composites. The sDC at room temperature of MWCNT-PMMA composites increased as mass concentration of MWCNTs increased, which followed percolation theory. Electromagnetic interference (EMI) shielding efficiency (SE) of MWCNT-PMMA composites was measured in the frequency range of 50 MHz-3.5 GHz. We observed the increase of EMI SE of MWCNT-PMMA composites with increasing the concentration of MWCNTs. (C) 2004 Elsevier B.V. All rights reserved.