石墨烯分散液及其组装膜的性能

摘要

Two kinds of surfactants, sodium dodecyl sulfate(SDS) and polyvinyl alcohol(PVA), were used to improve the dispersion of graphene in water. It was found that SDS can avoid the reunion between graphene layers, which makes the graphene evenly dispersed in the aqueous solution. Graphene ( G ) and Graphene flake films( GF) on the surface of ITO electrode were prepared via spin-coating with graphene dispersions. Scanning electron microscopy( SEM) and atomic force microscopy( AFM) results showed that the two types of graphene films represent a yarn shape of transparent flake structure. G/Ru and GF/Ru composite membranes were also prepared by molecular film self-assembly of the graphene films and Ru complex, which were charac-terized by cyclic voltammetry( CV) and ultraviolet-visible( UV-Vis) spectrometry. The results showed that the prepared composite films own high activity for the absorption of sunlight, indicating excellent photoelectric properties.%通过对比表面活性剂十二烷基硫酸钠( SDS)和聚乙烯醇( PVA)对石墨烯的分散能力，发现SDS可有效避免石墨烯片层之间的团聚，使得石墨烯在水溶液中分散得更加均匀.将浓度分别为0.39和0.30 mg/mL的石墨烯( G)和石墨烯片( GF)的SDS分散液旋涂在ITO电极表面制备出G膜和GF膜.透射电子显微镜和原子力显微镜观测结果表明，两类石墨烯膜均呈现出纱状透明的片状结构，同时具有石墨烯特有的褶皱.在石墨烯膜上继续进行钌配合物分子膜的自组装实验，得到G/Ru复合膜和GF/Ru复合膜.采用循环伏安法及紫外-可见吸收光谱法对石墨烯复合膜进行光电化学分析，结果表明石墨烯膜与钌配合物分子膜的复合可有效加强薄膜对太阳光的吸收.