铁镍合金与碳纳米管复合物的制备及吸波性能  

Preparation and Microwave Absorption Properties of FeNi Alloy/Carbon Nanotube Composites

作　　者：徐美华[1,2] 钟伟[1] 祁小四[1] 都有为[1] 

机构地区：[1]南京大学固体微结构物理国家重点实验室,南京210093 [2]南京工业大学应用物理系,南京210009

出　　处：《微纳电子技术》2011年第4期209-214,共6页Micronanoelectronic Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB923402;2011CB922102)

摘　　要：以采用溶胶凝胶结合氢气还原法制备出的铁镍合金纳米颗粒为催化剂,原位裂解苯,成功合成铁镍合金与纳米碳管的复合物。场发射扫描电镜和高分辨透射电镜结果显示复合物为一维纳米管状结构。微波电磁参数测量结果表明:随着试样厚度的增加,匹配频率处的理论反射损耗量呈下降趋势;当厚度为1.5mm时,FeNi22@C复合物的微波吸收效果最好,在频率11.35GHz处反射损耗量为-4.74dB;可以通过改变铁镍合金中各成分的比例、复合物吸收厚度,调整复合物的复数介电常数和复数磁导率,优化复合物的微波吸收性能。Nanocomposites of FeNi alloy/carbon nanotubes（CNTs）were synthesized by in-situ catalytic decomposition of benzene over FeNi nanoparticles produced by sol-gel fabrication and hydrogen reduction.FESEM and HRTEM investigations reveal that one-dimensional carbon species are produced.The test results of microwave electromagnetism parameters show that the theoretical reflection loss tends to decline at the matching frequency with the increase of the sample thickness.The sample FeNi22@C is an excellent candidate for microwave absorbent when the coating thickness is 1.5 mm,and the reflection loss is-4.74 dB with the frequency of 11.35 GHz.It is probable that by changing the component ratio of FeNi alloy and the absorption thickness of the composites and adjusting the complex permittivity and permeability of the composites,the microwave absorption properties of the composites can be optimized.

关 键 词：纳米复合物 铁镍合金 微波吸收 复数介电常数 复数磁导率 

分 类 号：TB383[一般工业技术—材料科学与工程] TM25[电气工程—电工理论与新技术]