Layer-by-layer self-assembly of in-situ polymerized (PSS/PANI)n composite films based on electrostatic interaction
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摘要: 基于静电相互作用, 从苯胺单体出发原位聚合、现场掺杂、层-层自组装制备多层聚苯乙烯磺酸钠(PSS)/聚苯胺 (PANI) 复合膜。为了明确控制PSS/PANI复合膜纳米结构的因素, 以紫外-可见(UV-Vis) 光谱跟踪PSS/PANI复合膜的成膜过程, 系统地研究了基片性质、氧化剂用量及沉积时间等溶液因素对单个双层复合膜纳米结构的影响, 得到了制备单个双层复合膜的较优条件。在此基础上变换苯胺单体浓度, 制备了不同纳米结构的多层复合膜(PSS/PANI)n, 并用原子力显微镜(AFM) 、扫描电镜(SEM) 及椭偏仪等对该多层复合薄膜的形貌结构进行了表征。结果表明, 通过控制沉积条件, 每双层复合膜的厚度可控制在40～100 nm, 电导率可达12. 675 mS·cm-1, 并且可制备增长均匀的8 个双层的(PSS/PANI)8复合膜。热失重分析(TGA) 表明, (PSS/PANI)n多层复合膜的热稳定性优于普通PSS/ PANI复合膜。
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关键词:
- ( PSS/ PANI) n复合膜 /
- 静电 /
- 层2层自组装 /
- 原位聚合
Abstract: The sodium polystyrene sulfonate (PSS) /polyaniline (PANI) composite films were prepared from
aniline (AN) monomers by in-situ polymerization , self2acid2doping and layer-by-layer self-assembly through the electrostatic force. In order to completely know the factors to control the nanostructure, the progress of polymerization of the PSS/PANI films was monitored by the UV-Vis spectra , and the influences of reaction conditions , such as subst rates , amount s of oxidant , and dipping time on the st ructure of PSS /PANI composite films were also stud2 ied. The (PSS/PANI) ncomposite films with different nanost ructures were then prepared at different aniline concen2 t rations. Atomic force microscope (AFM) , field emission scanning elect ron microscope (FESEM) and ellipsomet rywere employed to characterize the (PSS/ PANI)n composite films. By optimizing the deposition conditions, the thickness of the PSS/ PANI bilayer was controlled within 40～100 nm and the electrical conductivity of the PSS/PANI bilayer was 2. 675 mS ·cm-1. The uniform (PSS/PANI)8 composite films were also prepared under the optimumconditions. The result s of the thermal gravimetry analysis (TGA) showed that the thermal stability of (PSS/PANI) ncomposite films was stronger than that of general PSS/PANI composite films. -
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