Preparation and Characterization of Conductive and Magnetic PANI Nano-Composite
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摘要: 在纳米Fe3O4晶体粒子存在的情况下, 用十二烷基苯磺酸钠(SDBS)作乳化剂及分散剂, 通过HCl调节体系的酸度, 合成了导电、导磁的Fe3O4-聚苯胺(Fe3O4-PANI)纳米复合物, 用X-衍射(XRD)、透射电子显微镜(TEM)、傅立叶红外(FT-IR)等对该复合物进行了表征, 结果显示: SDBS与HCl发生竞争掺杂行为, 复合物的组成为Fe3O4-PANI-DBSA, Fe3O4平均粒径约13 nm, 且均匀分布在聚苯胺基体中, 该复合物具有较好的导电性及导磁性, 随着纳米Fe3O4含量由7.79%增加到35.34%, 复合物的电导率由1.71 S/m下降至0.41 S/m, 复合物的比饱和磁化强度σs则由6.14 A·m2/kg增加到18.11 A· m2/kg, 其矫顽力在0.52~0.73 A/m之间.Abstract: The Fe3O4-polyaniline(Fe3O4-PANI)nano-composites are synthesized via an in-situ polymerization of aniline monomer in SDBS-HCl aqueous solutions which contain well-dispersed Fe3O4nanoparticles, SDBS serving as surfactant and dispersant. The composites are characterized by means of XRD, TEM, FT-IR, et al. The results show that competing doping behavior happened between SDBS and HCl during the process of synthesis. The component of the composite is Fe3O4-PANI-DBSA. Fe3O4particlesin it are almost spherical with average size of 13 nm and dispersed in the base of PANI regularly. These composites possess good electrical conductivity and magnetization. With the content of Fe3O4increased from 7.79% to 35.34%, the conductivity of these composites gradually decreases from 1.71 S/m to 0.41 S/m, meanwhile the saturated magnetization(σs)increases from 6.14 A· m2/kg to 18.11 A·m2/kg, and the coercive force(Hc)is within the range of 0.52 A/m-0.73 A/m.
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Key words:
- Fe3O4nanoparticles /
- polyaniline /
- conductivity /
- magnetization
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图 2 Fe3O4-聚苯胺纳米复合物的多晶电子衍射图
Fig. 2. Electronic diffraction pattern of Fe3O4-PANI composite
图 3 掺杂态聚苯胺(a) 及Fe3O4-聚苯胺纳米复合物(b) X射线衍射图
Fig. 3. X-ray scattering of doped PANI (a) and Fe3O4-PANIcomposite (b)
图 4 掺杂态聚苯胺(a) 及Fe3O4-聚苯胺纳米复合物(b) 的红外光谱图
Fig. 4. FT-IR spectra of doped PANI (a) and Fe3O4-PANIcomposite (b)
表 1 聚苯胺及其复合物的电性能和磁性能
Table 1. Conductivity and magnetization of PANI, Fe3O4-PANI composites
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