MWNTs/掺溴聚苯胺复合材料导电性能研究

用化学氧化法和溴蒸气掺杂合成掺溴聚苯胺,通过机械共混制备MWNTs/PANI和MWNTs/掺溴PANI复合材料.复合材料表现出良好的导电性能,电导率达5～10 S·m~(-1),接近纯MWNTs的电导率.采用红外光谱、热重分析、紫外可见光谱、X射线粉末衍射和X射线光电子能谱研究MWNTs/掺溴PANI复合材料的导电性能和导电机理.研究表明,MWNTs和被掺杂的掺溴PANI通过π-π和p-π共轭作用形成电子转移复合物,组成了一个个独立导电单元,在复合材料的导电体系中起主要作用,随着导电单元数量增加至相互接触,形成导电网络,复合材料的电导率达到最大值.

Electrical conductivity properties of MWNTs/Br2 doped polyaniline composites

Br2 doped PANI was synthesised by chemical oxidation method and absorption of bromine vapor. MWNTs/PANI and MWNTs/Br2 doped PANI composites were prepared by mechanical blending method, The new composite exhibits as high electrical conductivity as that of pure MWNTs. 5~10 S·m^-1. Fourier transform infrared spectroscopy (FTIR), thermo gravimetric (TG), ultraviolet-visible absorption spectra (UV-Vis), X-ray powder diffraction (XRD) and X-ray spectroscopy (XPS) were used to study the electrical conductivity properties and mechanism. The results showed that π-π and p-π system is formed between MWNTs and doped PANI . MWNTs combined with the Br2 doped PANI to form charge transfer composites, then form individual conductive units, which play a critical role in forming the conducting net of composites. With the increase of conductive units, conducting system is formed by conductive unit connection and the conductivity of composites reaches the maximum.