化学气相沉积石墨烯-PMMA柔性气体阻隔纳米复合材料
Chemical Vapour Deposition Graphene-PMMA Nanolaminates for Flexible Gas Barrier
摘要：
充分利用石墨烯和相关材料的优异结构和多功能性能的成功方法具有极大的科学和技术兴趣。新的机会是由一类新的纳米复合材料与纳米层压结构的制造。在这项工作中，通过使用迭代剥离/浮上工艺结合湿法沉积，我们将通过化学气相沉积产生的cm-大小的石墨烯单层纳入聚（甲基丙烯酸甲酯）（PMMA）基质中，并具有受控的交替分层结构。所生产的纳米层压材料显示出机械性能的显著改善，具有增强的刚度、强度和韧性，仅添加0.06体积%的石墨烯。此外，在不同相对湿度水平下进行的氧气和二氧化碳渗透性测量揭示，与纯PMMA相比，石墨烯的添加导致渗透性的显著降低。总体而言，我们证明了所产生的石墨烯-PMMA纳米层压材料在气体阻隔性能方面超过了具有类似填料含量的传统的不连续石墨烯-颗粒复合材料。此外，我们发现，通过纳米复合材料的气体渗透率偏离作为相对湿度的函数的单调下降，这在纯PMMA纳米层压材料的情况下是明显的。这项工作表明，化学气相沉积石墨烯聚合物纳米层压材料可能用作柔性气体屏障，从而扩大了这种新型材料的应用范围。
英文摘要：
Successful ways of fully exploiting the excellent structural and multifunctional performance of graphene and related materials are of great scientific and technological interest. New opportunities are provided by the fabrication of a novel class of nanocomposites with a nanolaminate architecture. In this work, by using the iterative lift-off/float-on process combined with wet depositions, we incorporated cm-size graphene monolayers produced via Chemical Vapour Deposition into a poly (methyl methacrylate) (PMMA) matrix with a controlled, alternate-layered structure. The produced nanolaminate shows a significant improvement in mechanical properties, with enhanced stiffness, strength and toughness, with the addition of only 0.06 vol% of graphene. Furthermore, oxygen and carbon dioxide permeability measurements performed at different relative humidity levels, reveal that the addition of graphene leads to significant reduction of permeability, compared to neat PMMA. Overall, we demonstrate that the produced graphene-PMMA nanolaminate surpasses, in terms of gas barrier properties, the traditional discontinuous graphene-particle composites with a similar filler content. Moreover, we found that the gas permeability through the nanocomposites departs from a monotonic decrease as a function of relative humidity, which is instead evident in the case of the pure PMMA nanolaminate. This work suggests the possible use of Chemical Vapour Deposition graphene-polymer nanolaminates as a flexible gas barrier, thus enlarging the spectrum of applications for this novel material.
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