Fe_3O_4/聚苯胺纳米纤维的紫外光辅助化学氧化聚合法合成

Synthesis of Fe_3O_4/ polyaniline nanofibers by UV irradiation-assisted chemically oxidative polymerization

以苯胺为单体、过硫酸铵为氧化剂,采用紫外光辅助化学氧化聚合法制备了Fe_3O_4/聚苯胺(PANI)纳米纤维.借助X-射线衍射仪、红外光谱仪、扫描电镜、透射电镜、振动样品磁强计等对Fe_3O_4/PANI纳米纤维进行了表征,并研究了溶液pH和氧化剂浓度对产物化学组成和形貌的影响.结果表明,溶液p H和氧化剂浓度对产物的化学组成和形貌有显著的影响,降低p H值和提高氧化剂浓度均有利于提高Fe_3O_4/PANI纳米纤维的产率和形貌的规则程度,降低Fe_3O_4暴露在聚苯胺表面的程度.制备所得Fe_3O_4/PANI纳米纤维的磁含量为24.5%,在室温下呈现铁磁性.最后,推测了该磁性纳米纤维的形成机理.

Fe3O4/polyaniline ( Fe3O4/PANI ) nanofibers were facilely synthesized by UV irradiation-assisted chemically oxidant polymerization using aniline as monomer and ammonium peroxydisulfate as oxidant in aque -ous suspension of Fe3O4 nanoparticles.The obtained product was characterized by X-ray diffraction, infrared spectroscopy , scanning electron microscopy , transmission electron microscopy , vibrating sample magnetome-ter, etc.Effects of the solution pH and the oxidant concentration on the composition and morphology of the products were also investigated.The results showed that the composition and morphology of the magnetic nano-fibers were highly dependent on both the solution pH and the oxidant concentration.Both the yields and the morphological quality of the magnetic nanofibers could be improved as the reaction occured in a solution with low pH value as well as at a high concentration of the oxidant.Moreover, Fe3O4 nanoparticles were easy to be encapsulated into polyaniline fibers in these cases.Finally, the obtained magnetic nanofibers with a magnetite content of 24.5%behaved ferromagnetic at room temperature , a possible mechanism of synthesis of magnetic nanofibers was proposed.