碳纳米管/聚苯胺纳米复合管的制备及其微波介电特性研究  

Synthesis of carbon nanotube/polyaniline composite nanotube and its microwave permittivity

作　　者：赵东林[1] 曾宪伟[1] 沈曾民[1] 

机构地区：[1]北京化工大学可控化学反应科学与技术基础教育部重点实验室碳纤维及复合材料研究所,北京100029

出　　处：《物理学报》2005年第8期3878-3883,共6页Acta Physica Sinica

基　　金：北京市科技新星计划(批准号:H020821280120);中国博士后科学基金(批准号:2001030521)资助的课题.~~

摘　　要：用原位乳液聚合法在碳纳米管表面包覆聚苯胺,制备出了碳纳米管/聚苯胺一维纳米复合管.复合管的直径为50—80nm,聚苯胺包覆层的厚度为20—30nm,聚苯胺在碳纳米管表面以层状和枝晶状两种形态生长.研究了碳纳米管/聚苯胺复合管在2—18GHz的微波介电特性.与纯碳纳米管相比,碳纳米管/聚苯胺复合管的介电常数的实部ε′和虚部ε″在2—18GHz随频率变化较小,在低频波段介电常数值较小,作为微波吸收剂容易实现与自由空间的阻抗匹配,而且它的介电损耗角正切(tanδ=ε″/ε′)较高,是一种很好的微波吸收剂.A carbon nanotube/polyaniline composite nanotube with a diameter of 50-80 nm has been prepared. The carbon nanotubes encapsulated by polyaniline (PANI) with a thickness of 20-30 nm have been synthesized by in-situ emulsion polymerization. The microwave permittivity of the carbon nanotube/polyaniline composite nanotubes has been investigated in the frequency range of 2-18 GHz. The real part (epsilon') and imaginary part (epsilon') of the complex permittivity of carbon nanotube/polyaniline composite nanotube change little, as compared with those of carbon nanotubes at frequencies 2-18 GHz. The epsilon' and epsilon' of the carbon nanotube/polyaniline composite nanotube are small at low frequencies, which make it easy to match the impedance of free-space in the design of microwave absorbing materials. The dissipation factor tan delta (epsilon'/epsilon') of carbon nanotube/polyaniline composite nanotube is high. So the carbon nanotube/polyaniline composite nanotube is a good microwave absorbent.

关 键 词：碳纳米管 聚苯胺 复合管 特性研究 制备 介电损耗角正切 微波吸收剂 微波介电特性 乳液聚合法 表面包覆 频率变化 介电常数 阻抗匹配 自由空间 TANΔ 包覆层 直径 一维 虚部 实部 

分 类 号：TB383[一般工业技术—材料科学与工程]