聚苯胺
反射损耗
碳纳米管
介电损耗
材料科学
吸收(声学)
电介质
色散(光学)
复合材料
光电子学
复合数
聚合物
光学
聚合
物理
作者
Yueyi Wang,Wen-Jin Sun,Hao Lin,Pei Gao,Jiefeng Gao,Kun Dai,Ding‐Xiang Yan,Zhong‐Ming Li
标识
DOI:10.1016/j.compositesb.2020.108309
摘要
Carbon nanotubes (CNTs) are potential electromagnetic (EM) wave absorption (MA) material due to the strong dielectric loss, nevertheless, sole CNTs suffer from limited MA ability because of the interface impedance mismatch of CNTs and the skin effect, which leads to high reflection of EM wave. The impedance mismatch characteristics of CNTs can be effectively improved by incorporation of polyaniline (PANI) with an intermediate conductivity. However, to optimize the dispersion of CNTs and incorporate PANI into CNTs uniformly, chemical modifications were generally utilized. These methods involve strong acid and thus suffers from long-term and high risk. In particular, these methods would destroy the conjugate structure of CNTs and thus deteriorate the dielectric loss. Herein, the introducing of polyvinyl pyrrolidone (PVP) not only improves the dispersion of CNTs, but also helps to produce the monomer micelle and uniformly self-assemble on the surface of CNTs as steric stabilizer. The uniform PANI shell can solve the contradiction between strong dielectric loss of CNTs and the poor property of impedance match between CNTs and air, resulting in excellent MA ability. The minimum reflection loss (RLmin) of obtained CNT/PANI hybrid reaches −41.5 dB at 9.5 GHz when the absorber mass ratio was only 10% due to the good dispersion of CNT/PANI hybrids. The effective absorption bandwidth (EB) with RL ≤ −10 dB reaches 5.1 GHz at the thicknesses of 2 mm. This work provides a facile, eco-friendly and defect-free way to fabricate CNT/PANI hybrid with excellent and tunable performance of MA.
科研通智能强力驱动
Strongly Powered by AbleSci AI