Li_(0.35)Zn_(0.3)Fe_(2.35)O_4/PANI树枝状复合吸波材料的制备与表征

Synthesis and Characterization of Li_(0.35)Zn_(0.3)Fe_(2.35)O_4/PANI Dendritic Composites

通过溶胶凝胶法制备了尖晶石型锂锌铁氧体（Li0．35Zn0．3Fe2.35O4），并采用界面聚合法制备了不同质子酸掺杂的锂锌铁氧体／聚苯胺（Li0．35Zn0．3Fe2.35O4／PANI）树枝状复合吸波材料。通过傅里叶变换红外光谱（FT-IR）、X射线衍射法（XRD）、扫描电子显微镜（SEM）和矢量网络分析（VNA）等现代分析技术对其化学组成、微观形貌、电磁性能、吸波性能进行了表征。结果表明：PANI纤维在Li035Zno3Fe23504表面按树枝状生长机制进行接枝聚合。以盐酸（HCl）掺杂制备的Li0．35Zn0．3Fe2.35O4,dPANI树枝状复合吸波材料中PANI纤维长径比最大（直径为75～90nm，长度为710～800nm），反射损耗小于-10dB的频宽可达到4．1GHz，分别在频率为3．9和15.8GHz时，其反射损耗峰值分别为-20．5和-33．1dB，具有良好的吸波性能。

Spinel lithium zinc ferrite（Li0.35Zn0.3Fe2.35O4） was prepared by a sol-gel method, which was composed with polyaniline by an interfacial polymerization method. FT-IR, XRD, SEM and vector network analyzer （VAN） were used to investigate chemical composition, micro-morphology, electromagnetic property and microwave absorbing property of the composite. The results show that polyaniline fibers are grafted on the surface of Li0.35Zn0.3Fe2.35O4 particles to form dendritic structure. The length to diameter ratio reaches maximum when PANI fibers are doped by hydrochloric acid （HC1） （diameter 75-90 nm, length 710-800 nm） . Absorption bandwidth with reflection loss value 〈 -10 dB is up to 4.1 GHz and the maximum microwave decay value is -20.5 dB at 3.9 GHz and -33.1 dB at 15.8 GHz. The dendritic composite exhibits excellent microwave absorbing capacity.