Coating process and stability of metal-polyphenol film
Coating process and stability of metal-polyphenol film
复制标题
DOI：
10.1016/j.colsurfa.2015.07.061
复制
发表时间：
2015-11
期刊：
影响因子：
--
通讯作者：
Liwei Yang;Lulu Han;Jun Ren;Houliang Wei;Lingyun Jia
中科院分区：
文献类型：
--
作者：
Liwei Yang;Lulu Han;Jun Ren;Houliang Wei;Lingyun Jia
涂覆在材料表面的超分子金属有机薄膜引起了化学和材料科学的极大兴趣。单宁酸 (TA) 是一种天然多酚产品，最近被证明能够通过与 Fe3+ 离子配位进行交联，从而提供一种新型金属有机体系，在各种基材上构建纳米级涂层。然而，Fe3+-TA薄膜的涂覆工艺以及影响薄膜稳定性的实验参数尚不清楚。在本研究中，我们以石英和硅为模型基底，探讨了实验参数（试剂添加顺序、碱添加顺序和基底表面润湿性）对Fe3+-TA薄膜稳定性的影响，并进一步推断了涂层过程的机理。结果表明，以与试剂添加顺序相反的顺序制备的Fe3+-TA薄膜在成膜过程中表现出完全不同的生长曲线。碱溶液的添加对膜厚影响很小，但改变了膜的结构和形貌，显着提高了膜的稳定性。此外，低润湿性表面有利于形成稳定的Fe3+-TA薄膜。通过化学成分分析，明确了这些薄膜的形成机制。这项研究提供了对 Fe3+-TA 薄膜涂层过程的更好理解，这将有利于开发具有特定应用所需性能的稳定 Fe3+-TA 系统。
Supramolecular metal-organic thin films coated on material surfaces have attracted considerable interest in chemistry and materials science. Tannic acid (TA), a natural polyphenol product, has been recently demonstrated to be able to crosslink through coordination with Fe3+ions, thus providing a novel metal-organic system to build nano-scale coating on various substrates. However, the coating process of Fe3+-TA film and the experimental parameters that influence the stability of the film are not well elucidated. In this study, we explored the effects of experimental parameters (order of reagents addition, addition of alkali and surface wettability of the substrates) on the stability of the Fe3+-TA film, and further inferred the mechanism of the coating process, using quartz and silicon as model substrates. The results showed that the Fe3+-TA films prepared in reverse order of reagent addition exhibited totally different growth profiles during the film formation process. The addition of alkali solution had very little impact on the film thickness, but changed the structure and morphology of the film and dramatically improved its stability. Moreover, low-wettable surface facilitates the formation of stable Fe3+-TA film. By the analysis of the chemical compositions, the mechanisms of the formation of these films were specified. This study provides a better understanding of the coating process of the Fe3+-TA film, which would benefit to develop the stable Fe3+-TA system with desirable properties for specific applications.