現今導電高分子與無機物形成的複合材料已被廣泛的研究和應用在半導體元件、醫學、感測器，防電磁波材料上。故我們成功的合成出聚苯胺(Polyaniline)摻雜β-NSA的複合材料且包含了四氧化三鐵之磁性奈米粒子，讓此複合材料同時擁有導電的性質與磁性的性質。此方法是利用β-NSA的陰離子與aniline陽離子形成微胞且這微胞包含了磁性奈米粒子，再經由聚合反應就可以得此複合材料；也因包含了磁性奈米粒子使得此複合材料展現出超順磁的特性，藉由SEM與TEM證明氧化鐵的存在。同時發現PANI-βNSA/Fe3O4複合材料的形狀與導電度會因為加入氧化鐵的含量多寡而有所改變，且導電度可達到10-3s/cm，而我們也利用電路的觀點解釋摻雜上氧化鐵對於聚苯胺導電度的影響。再此我們亦把PANI-βNSA/Fe3O4之複合材料做成薄膜，利用它同時擁有磁性與電性雙重性質，應用在遮蔽電磁波的材料上。

　The composite materials formed by conducting polymers and inorganic materials have been widely developed and applied in semiconductor, sensors and shielding materials. We have successful synthesized polyaniline composite containing Fe3O4 (diameter: 6nm) in the presence of β-naphthalene sulfonic acid (β-NSA). The prepared composite has both properties conductivity and magnetism. SEM and TEM measurements were performed to elucidate the existence of Fe3O4 doping in polyaniline polymer. The characteristics including electricity, magnetism, and morphology were studied by a change of the concentration of Fe3O4 dopant for PANI-βNSA/Fe3O4 composites. Because our iron oxide nanoparticles would self-assemble into rod-like shapes from spherical particles in the course of aging process. On the basis of this self-assembled results, we have also studied the conductivity as a function of particle morphology. For the investigation of electromagnetic interference shielding, PANI-βNSA/Fe3O4 composites were made in a form of films. It was found that the shield value could reach 6.9dB at 1.5GHz. The shielding value would increase with increase amount of the composite added in the film.

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