海参状镍@聚苯胺(Ni@PANI)纳米复合材料的制备及其微波吸收性能

Preparation and Microwave Absorption of Sea Cucumber-like Ni@PANI Nanocomposites

本文采用原位聚合法以氯化镍和苯胺为原料制备了镍@聚苯胺（Ni@PANI）纳米复合材料,研究了该纳米复合材料在2~18GHz频段内的微波吸收性能,在14GHz时测得最大反射损耗为-35dB,吸波频带宽度约4GHz,这使镍@聚苯胺纳米复合材料优于单一的聚苯胺材料和镍离子掺杂的聚苯胺材料。对其介电常数、磁导率以及界面极化情况的研究结果表明镍@聚苯胺纳米复合材料的优良的吸波性能来自于其同时具有介电损耗和磁损耗,以及界面极化增强。

Electrically conducting polyaniline （PANI）-Ni nanocomposites （named as Ni@PANI） were prepared by in-situ polymerization in the presence of camphorsulfonate （CSA） as a doping acid, and ammonium persulfate （APS） as an oxidant. The crystal structures of the samples were analyzed by X-ray diffractiometry （XRD）. The complex electromagnetic parameters were measured with a vector network analyzer in the frequency range of 2-18GHz. The results indicate that the Ni@PANI has the maximum reflection loss of --35 dB at 14GHz, which is much greater than those of PANI and NiC12 @PANI, respectively. The improved microwave absorption performance can be attributed to the dielectric loss as well as the magnetic loss, and also the enhanced interface relaxation.