采用溶剂热法制备出一种包含BaTiO3和多壁碳纳米管(MWCNTs)的复合吸波剂. 通过透射电镜分析吸波剂的形貌发现: 粒径为15~30 nm的BaTiO3颗粒均匀地包覆在MWCNTs的外壁. 电磁波吸收性能分析表明: BaTiO3/ MWCNT纳米复合吸波剂的反射损耗(RL)要大于BaTiO3和MWCNTs, 这是由于其有更好的阻抗匹配和更高的复合磁导率. 当单层材料的计算厚度为2mm时, BaTiO3/MWCNT纳米复合吸波剂的RL在9.6~13.1 GHz的频段中超过了–10dB, 同时在10.4 GHz处达到最大值–37.5 dB. 为了研究BaTiO3/MWCNT纳米复合吸波剂与聚丙烯腈(PAN)基体的相容性和其杂化纤维的可纺性, 采用静电纺丝成型制备吸波剂含量为10wt%的PAN杂化纤维. 通过X射线衍射和扫描电子显微镜分析发现: BaTiO3/MWCNT纳米复合吸波剂成功与PAN纤维杂化, 吸波剂的结构在成型过程中没有变化, 吸波剂的添加并未影响纤维形貌.
BaTiO3/multi-walled carbon nanotubes (MWCNTs) composite was synthesized by an efficient solvent-thermal route. Transmission electron microscope images clearly indicate that the surfaces of the MWCNTs are uniformly decorated by well-crystallized BaTiO3 particles with diameters of 15-30 nm. The result of Electromagnetic (EM) wave absorption properties analysis, determined by the EM parameters, shows that the reflection loss (RL) in the BaTiO3/MWCNT composite is higher than that occurring in pure MWCNTs or BaTiO3, which resulted from the better matched characteristic impedance and enhanced complex permeability in the high frequency. The maximum RL of –37.5 dB in the BaTiO3/MWCNT composite is obtained at a frequency of 10.4 GHz and the absorption range is under –10 dB in the frequency range of 9.6–13.1GHz with the absorber thickness of 2 mm. BaTiO3/MWCNT/PAN hybrid fibres, derived from a PAN solution containing 10 wt% BaTiO3/MWCNT composite, were prepared by the electrospinning process. The results of XRD and SEM indicated that both the structure of BaTiO3/MWCNT composite and the morphology of PAN changed little after the hybrid process. BaTiO3/MWCNT composite has the well compatibility with PAN matrix.
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