Layer-by-layer assembly and tribological property of multilayer ultrathin films constructed by modified graphene sheets and polyethyleneimine
Layer-by-layer assembly and tribological property of multilayer ultrathin films constructed by modified graphene sheets and polyethyleneimine
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DOI：
10.1016/j.apsusc.2011.09.011
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发表时间：
2012-01
影响因子：
6.7
通讯作者：
Sheng Liu;J. Ou;Zhangpeng Li;Shengrong Yang;Jinqing Wang
中科院分区：
文献类型：
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作者：
Sheng Liu;J. Ou;Zhangpeng Li;Shengrong Yang;Jinqing Wang
以带负电荷的聚苯乙烯磺酸钠（PSS）介导的石墨烯片（PSS-GS）和带正电荷的聚乙烯亚胺（PEI）为基础，采用层层静电自组装技术制备了一系列石墨烯片（GS）多层膜。高分辨透射电子显微镜、原子力显微镜和显微拉曼光谱表征表明，PSS-GS已经合成并可组装在单晶硅衬底上。椭偏厚度测量和紫外-可见吸收光谱证实了GS的连续组装。最后，在球-板宏观摩擦磨损试验机上对不同多层膜的宏观摩擦学性能进行了评价，结果表明，所制备的三层和五层膜具有较高的承载能力和较长的抗磨寿命，这可能与GS本身具有的高覆盖率和优异的自润滑性能密切相关。
A series of graphene sheets (GS)-based multilayer films was constructed in virtue of layer-by-layer electrostatic self-assembly technique based on the negatively charged poly(sodium 4-styrenesulfonate) (PSS) mediated GS (PSS-GS) and the positively charged polyethyleneimine (PEI). High-resolution transmission electron microscope, atomic force microscope and micro-Raman spectrum characterizations demonstrated that the PSS-GS has been synthesized and could be assembled on the single-crystal silicon substrate. Ellipsometric thickness measurement and ultraviolet–visible absorption spectroscope confirmed the successive assemblies of GS. Finally, the macrotribological behaviors of different multilayer films were evaluated on a ball-on-plate macrotribometer and the results indicated that the prepared three- and five-layer films had high load affording ability and long anti-wear life, which could be highly dependent upon the high coverage and excellent self-lubricant properties that the GS owns intrinsically.