聚苯胺纳米纤维/锂锌铁氧体复合吸波材料的制备与性能

Preparation and property of polyaniline nanofibers/lithium zinc ferrite composite absorbents

采用溶胶-凝胶法制备锂锌铁氧体（Li_（0.435）Zn_（0.195）Fe_（2.37）O_4,LZFO）,界面聚合法制备纯聚苯胺（PANI）和PANI纳米纤维/LZFO复合材料。通过SEM、XRD、FTIR和矢量网络分析（PNA）等对材料的物相、结构和吸波性能进行了表征和分析。结果表明：制备出的样品分别为PANI、LZFO和不同配比的PANI纳米纤维/LZFO复合材料。在2～18GHz范围内,PANI纳米纤维/LZFO复合材料的电磁波反射率〈-10dB的波段有2个,吸波性能较纯PANI和LZFO有了很大提高,并且拓宽了吸波频带,当PANI纳米纤维/LZFO复合材料中PANI纳米纤维的质量分数为10%,其综合吸波性能最佳,电磁波反射率〈-10dB的波段分别为2.5～5.5GHz波段和14.5～16.5GHz波段,最大吸收峰可达到-33.8dB。而PANI和LZFO在电磁波反射率〈-10dB的波段只有1个。因此通过PANI纳米纤维接枝铁氧体,可调节电磁参数,提高材料的吸波性能。

Lithium zinc ferrite（Li_（0.435）Zn_（0.195）Fe_（2.37）O_4,LZFO）was prepared by sol-gel method and interfacial polymerization method was used to prepare pure polyaniline（PANI）and PANI nanofibers/LZFO composites.The phase,structure and microwave absorption property of the materials were analyzed and characterized by SEM,XRD,FTIR and vector network analyzer（PNA）.The results show that the samples are PANI,LZFO and different ratio of PANI nanofibers/LZFO composites.In the range of 2-18 GHz,PANI nanofibers/LZFO composites emerge two bands corresponding to electromagnetic wave reflection loss below-10 dB.The PANI nanofibers enhance the wave-absorbing property and widen the wave-absorbing band of PANI nanofibers/LZFO composites compared with PANI and LZFO.When the mass fraction of PANI nanofibers for PANI nanofibers/LZFO composites is 10%,the composites get the best comprehensive wave-absorbing properties.The peak of absorption could reach-33.8dB and the bands corresponding to electromagnetic wave reflection loss below-10 dB lay in 2.5-5.5GHz and 14.5-16.5GHz.While the PANI and LZFO only emerge one band corresponding to electromagnetic wave reflection loss below-10 dB.Therefore,the electromagnetic parameter is adjusted and the microwave absorption property improves through grafting PANI nanofibers with ferrite.