聚苯胺/CoC_2O_4纳米复合物的制备与电磁性质

Preparation and Electromagnetic Properties of PAn/CoC_2O_4 Nanocomposites

采用固相低热合成法制备了纳米草酸钴,在不同条件下将聚苯胺原位生长在草酸钴表面获得兼具导电性和导磁性的聚苯胺/CoC2O4纳米复合物。考察了反应物配比、混合条件、活性剂的种类和用量对产物形貌结构及其电磁性质的影响。通过透射电子显微镜、X射线衍射、热重分析等测试技术表征了合成产物。结果表明,通过改变纳米CoC2O4与聚苯胺原位生长的复合条件可以有效调控产物的形貌结构及其微波吸收性能。最佳实验结果为:在超声作用下获得的聚苯胺/CoC2O4试样在8.6 GHz处具有最大的反射损耗(-28.8 dB),大于-10 dB的带宽达3.2 GHz。

Polyaniline/CoC2O4 nanocomposite with both electrical and magnetic conductivities was synthesized by means of in-situ growth of polyaniline under different conditions on the surface of nano-cobalt oxalate,which was obtained by low heating solid state reaction.The influences of different reaction conditions including reactants′ ratio,mixing methods,type and quantity of surfactants on the morphology and structure and their electromagnetic properties of resulting composites were investigated.The products were characterized by TEM,XRD,and TG analysis techniques.The results indicate that the morphology and structure and their microwave absorbing performance of the as-prepared nanocomposites can be effectively tuned by changing the in-situ complex conditions.The optimal experimental results were as follows：polyaniline/CoC2O4 nanocomposite obtained under ultrasonication showed a maximum reflection loss of-28.8 dB at 8.6 GHz with a bandwidth of 3.2 GHz above-10 dB loss.