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Published on: February 12, 2019
PANI/BaFe12O19@Halloysite ternary composites as novel microwave absorbent
Zihao Chen1, Dawei Mu1, Tianhao Liu1
1Centre for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China; Key Laboratory for Mineral Materials and Application of Hunan Province, Central South University, Changsha, Hunan 410083, China; Key Lab of Clay Mineral Functional Materials in China Building Materials Industry, Central South University, Changsha, Hunan 410083, China.
Abstract:
A three-phase PANI/BaFe12O19@Hal heterostructure was designed and fabricated in this paper as efficient lightweight electromagnetic wave absorbing material through the combination of citrate assisted sol-gel self-propagating combustion and in-situ oxidative polymerization of aniline. In addition, the effects of the weight ratio of different PANI to BF@Hal on the microwave absorption properties of the materials were studied. The results show that when the weight ratio of PANI is 40%, the material has the best microwave absorption performance. The frequency bandwidth below -5 dB reached 9.60 GHz and the minimum absorption peak at 11.92 GHz was -14.77 dB. The combination of the PANI and BF@Hal nanosheets take advantage of the interfacial polarization, natural resonance, dielectric polarization and trapping of EM waves by internal reflection in PANI/BaFe12O19@Hal. Taking advantage of the unique microscopic morphology and interface characteristics, halloysite was introduced to improve the microwave absorption performance and enrich the absorbing mechanism of the composite materials. This work may provide a reliable candidate for the synthesis of electromagnetic attenuation materials with fairly good performances.
