Gas permeation and microstructure of reduced graphene oxide/polyethyleneimine multilayer films created via recast and layer-by-layer deposition processes,RSC Advances

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Gas permeation and microstructure of reduced graphene oxide/polyethyleneimine multilayer films created via recast and layer-by-layer deposition processes
RSC Advances ( IF 3.9 ) Pub Date : 2022-02-25 , DOI: 10.1039/d1ra09205g
Chongshan Yin ₁ , Xuan Du ₁ , Zhi Ding ₁ , Qing Zeng ₁ , Xi Li ₁ , Chunqing He ₂ , Bangyun Xiong ₃ , Jingjing Li ₃ , Yawei Zhou ₄

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Nowadays, graphene/polymer composite films with multilayer structure have attracted significant attention for gas barrier application. In this study, a series of reduced graphene oxide/polyethyleneimine (RGO/PEI) composite films were created via recast and layer-by-layer deposition processes. By using the recast process, the myriad PEI molecules in the precursor solution (the PEI : GO feeding ratio is 0.02 : 0.1, 0.05 : 0.1, 0.1 : 0.1, 0.3 : 0.1 and 0.5 : 0.1) ensure more effective reduction and surface modification of the graphene oxide (GO) sheets, while the undesirable free PEI molecules are eventually removed via a filtration process. Then, the RGO/PEI composite films were synthesized on PET substrate using a layer-by-layer assembly. The resulting films show a homogeneous and compact brick-wall structure with excellent gas barrier properties. Barriers against water vapor, nitrogen/oxygen, and carbon dioxide require different content of PEI in the composite film for optimal performance; the ideal values are 19.7, 23.8, and 24.1 wt%, respectively. These values are much lower compared with previously reported studies. Further, the permeability, free volumes, component ratio, morphology, and density of the RGO/PEI composite films have been carefully investigated and discussed. The results revealed that the mechanism behind the excellent gas barrier property of the RGO/PEI composite films is a synergistic effect created by the combination of the brick-wall structure, the small free volume holes, the suitable PEI content (ranging from 19.7 wt% to 24.1 wt%), the high density, and the hydrophobicity.

中文翻译：

通过重铸和逐层沉积工艺制备的还原氧化石墨烯/聚乙烯亚胺多层薄膜的气体渗透性和微观结构

如今，具有多层结构的石墨烯/聚合物复合薄膜在阻气应用方面引起了人们的广泛关注。在这项研究中，通过重铸和逐层沉积工艺创建了一系列还原氧化石墨烯/聚乙烯亚胺（RGO/PEI）复合薄膜。通过使用重铸工艺，前驱体溶液中的无数PEI分子（PEI：GO投料比为0.02：0.1、0.05：0.1、0.1：0.1、0.3：0.1和0.5：0.1）确保了更有效的还原和表面改性氧化石墨烯 (GO) 片，而不需要的游离 PEI 分子最终通过过滤过程去除。然后，采用逐层组装的方法在 PET 基底上合成 RGO/PEI 复合薄膜。所得薄膜呈现均匀致密的砖墙结构，具有优异的气体阻隔性能。复合薄膜中需要不同含量的 PEI 来阻隔水蒸气、氮气/氧气和二氧化碳，以获得最佳性能；理想值分别为 19.7、23.8 和 24.1 wt%。与之前报道的研究相比，这些值要低得多。此外，还对 RGO/PEI 复合膜的渗透性、自由体积、成分比、形态和密度进行了仔细研究和讨论。结果表明，RGO/PEI复合薄膜优异的气体阻隔性能背后的机制是砖墙结构、小自由体积孔、合适的PEI含量（范围为19.7 wt%）相结合产生的协同效应。至 24.1 wt%）、高密度和疏水性。

更新日期：2022-02-25

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