醇溶性聚芴分散单壁碳纳米管的研究

摘要

As-prepared single-walled carbon nanotubes (SWNTs) are typically grown as bundles,which offer a hindrance to their extensive applications.A novel alcohol-soluble polyfluorene (PFN) was designed and synthesized by the Suzuki polycondensation and used to solubilize SWNTs through non-covalent strategy in methanol solution.The SWNTs extract was quite stable for at least 30 days without sedimentation.The individualization of SWNTs in methanol after ultrasonication in the presence of PFN was characterized by transmission electron microscopy(TEM),absorption and photoluminescence (PL) spectroscopy.The TEM images of the PFN-SWNT complexes clearly exhibit that most of SWNTs were wrapped in a thin PFN layer,suggesting the PFN can easily disperse SWNTs by uhrasonication.The considerable red-shifts of the absorption spectra of PFN-SWNTs may be attributed to πr-πr interactions between PFN and SWNTs.The PL spectra reveal that the intensity of emission of the complexes relatively decrease as a result of photoinduced electron transferring between the PFN and SWNTs.%采用铃木缩聚反应设计和合成一种新型醇溶性聚合物(PFN),利用PFN非共价修饰单壁碳纳米管(SWNTs),实现SWNTs的分散.复合体(PFN-SWNTs)放置30 d后,没有沉淀产生,性能稳定,解决了SWNTs易聚集的问题.通过透射电子显微镜、吸收光谱和荧光光谱对复合体进行了详细的表征.结果表明:多数SWNTs分散在PFN表面,说明在超声法条件下PFN对SWNTs有很好的分散效果;PFN与SWNTs通过π-π相互作用导致PFN-SWNTs吸收光谱红移;荧光测试发现部分光生电子转移到SWNTs表面,聚合物的荧光强度减弱.