富勒醇与阳离子聚电解质复合薄膜的制备与表征

SELF-ASSEMBLY AND CHARACTERIZATION OF COMPOSITE THIN FILMS OF FULLEROLS AND POLYCATIONS

采用静电自组装技术制备了富勒醇与聚对亚苯亚乙烯基 (PPV)的前驱体、聚二烯丙基二甲基氯化铵(PDDA)的复合薄膜 ,利用紫外 可见光吸收光谱 (UV Vis)、原子力显微镜 (AFM )、透射电镜 (TEM)和X射线光电子能谱 (XPS)对薄膜进行了表征 .UV Vis吸收光谱显示 ,在特定波长下自组装薄膜的吸光度与薄膜的双层数成线性关系 ,组装过程具有一致性与重复性 .AFM图象显示富勒醇组装到基片表面后形成直径为几十到10 0多nm的团簇 .富勒醇溶液过滤后组装薄膜 ,薄膜具有较好的均匀性 ;富勒醇溶液不经过滤 ,直接组装薄膜 ,将在薄膜中引入C6 0 晶粒 .XPS分析结果提示C6 0 被羟基修饰并通过静电吸引机制与阳离子聚电解质组装成膜 .富勒醇与PPV的前驱体、PDDA具有很好的自组装性能 ,膜层间的结合力较强 ,所组装的薄膜具有较高的牢固度 .

Fullerols were electrostatically self-assembled into composite thin films with the precursor of poly(p-phenylene vinylene) (PPV) and with poly (diallyldimethylammonium chloride) (PDDA) The composite thin films were characterized by UV-Vis spectroscopy (UV-Vis), atomic force microscopy (AFM) transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) The UV-Vis data showed that there were linear increments in the optical absorption at given wavelengths of the composite thin films as the bilayer numbers of the thin films were increased and that the assembling processes were consistent and reproducible from bilayer to bilayer. AFM images showed that clusters of dozens to a hundred or so nanometers in diameter were formed after the fullerols were assembled onto the substrates. If the aqueous solutions of fullerols were filtered before thin film assembling, the composite thin films would be statistically uniform. Otherwise, crystalline C-60 would be embedded into the thin films. XPS data confirmed that C-60 was modified into fullerols and electrostatically assembled with the polycations. Fullerols can easily be assembled with PPV precursor and PPDA, into composite thin films, the resulting thin films being. tougher than many self-assembled polyelectrolyte thin films perhaps due to stronger electrostatic attractive interaction between the fullerols and the polycations.