配位-氧化聚合-水热法制备聚苯胺/CoFe_2O_4纳米复合物及其微波吸收性能

采用"配位-氧化聚合-水热法"制备了本征态聚苯胺/CoFe2O4二元纳米复合物,再以磺基水杨酸掺杂获得聚苯胺/CoFe2O4电磁复合物.考察了反应物配比及掺杂酸浓度对产物电磁性能的影响.通过透射电子显微镜(TEM)、X射线衍射(XRD)、红外光谱(FTIR)及电磁测量等手段对聚苯胺/CoFe2O4的形貌、结构及性能进行了表征.结果表明,复合物呈现多级结构,其中CoFe2O4为立方体状,平均粒径小于20 nm.当CoFe2O4的质量分数为8.86%时,复合物的电导率约为0.43 S/cm;当聚苯胺/CoFe2O4复合物厚度为2 mm时,在16.01 GHz处最大反射损耗为-16.71 dB,小于-10 dB的带宽达4.68 GHz;而当聚苯胺/CoFe2O4复合物厚度为3.2 mm时,在9.23 GHz处最大反射损耗达-51.81 dB,小于-10 dB的带宽为3.69 GHz,表明具有良好的吸波性能.

Preparation and Microwave Absorption Performance of Polyaniline/CoFe2O4 Nano-composite by Coordination-oxidative Polymerization-hydrothermal Method

Polyaniline/CoFe2O4 binary nano-composites were prepared by coordination-oxidative polymerization-hydrothermal method, and doped by sulfosalicylic acid. The influence of reactants ratio and concentration of doping acid on electromagnetic properties of resulting composites was investigated. The micrographs, structure and electromagnetic properties of polyaniline/CoFe2O4 composites were characterized by TEM, XRD, FTIR and electromagnetic measurements. The results indicate that the prepared composite show a multi-level structure in which CoFe2O4 is cube-shaped with an average particle size less than 20 nm. The optimal experimental results were as follows: the conductivity of the composite is about 0.43 S/cm when the content of CoFe2O4 in composite is 8.86%(mass fraction). When the thickness of PAn/CoFe2O4 composite is at 2 mm, a maximum reflection loss of -16.71 dB at 16.01 GHz is observed with a bandwidth of 4.68 GHz above -10 dB loss; and when the thickness of PAn/CoFe2O4 composite is at 3.2 mm, a maximum reflection loss of -51.81 dB at 9.23 GHz is observed with a bandwidth of 3.69 GHz above -10 dB loss. The nanocomposite exhibits excellent microwave absorbing capacity.