聚3-辛基噻吩/MWNTs复合材料的导电性能研究

采用在氯仿溶液中超声共混, 制备聚3-辛基噻吩(P3OT)和多壁碳纳米管(MWNTs)复合材料. 当MWNTs掺杂量为3%时复合材料的电导率为1.43 S•m－1, 达到纯MWNTs的电导率水平. 用FTIR光谱, TG, UV-Vis光谱, XPS和FESEM进行研究分析, 认为MWNTs的离域电子与P3OT主链上的π电子之间形成π-π共轭, 增加了P3OT主链的有效共轭度, 被掺杂的P3OT具有很高的电导率, 提高了复合材料的导电性能. MWNTs与被掺杂的P3OT组成相对独立的导体单元, 对复合材料的导电网络形成起着主要作用.

Conductive Properties of Poly(3-octylthiophene)/Multi-walled Carbon Nanotubes Composites

Multi-walled carbon nanotubes (MWNT) were used as filler to prepare poly(3-octylthiophene) (P3OT)/MWNT composites in chloroform, which were ultrasound blended. When the content of MWNTs was 3%, the conductivity of composite almost attained that of pure MWNT (1.43 S•m－1). Fourier transform infrared spectroscopy (FTIR), thermo-gravimetry (TG), X-ray spectroscopy (XPS), ultraviolet-visible absorption spectra (UV-Vis) and field emission scanning electron microscopy (FESEM) were employed to characterize these composites. The results suggest that π-π system is formed between the delocalized electrons in MWNT and the π-electrons in the conjugated main chain of P3OT. The effectively conjugated chain of P3OT is prolonged by MWNTs. The doped P3OT has a high conductivity and can improve the conductivity of composites. MWNT was combined with the doped P3OT to form individual conductive units, which play a key role in forming the conducting net of composites.