氧化石墨烯是由六碳環所組成的二維結構，其高縱橫比和出色的機械強度，使其在氣體阻隔的應用上是一項具有潛力的材料。相關的研究指出，其材料出色的長徑比為氣體擴散提供了更曲折的路徑，從而提高了整體材料的阻氣性能。氧化石墨烯膜對於控制厚度和堆疊結構以實現卓越性能至關重要，氧化石墨烯整體結構的有序程度是影響分離表現的關鍵因素。因此我們設計一系列的實驗條件來觀察整體結構對氣體滲透的差異，並進一步討論對溶解及擴散係數的影響程度。 在這項研究中，目標為提升整體複合材料的氣體阻隔性能。氧化石墨烯是透過改進的Hummers法從商業石墨粉合成。首先，製備特定濃度的GO分散液，並通過使用逐層組裝提出了簡便的表面塗佈方法，該方法將自動噴塗和溶劑蒸發方法進行結合，此方法提供了連續加工與擴大規模的程序，在乙基纖維素基材上沉積了氧化石墨烯膜以提高氣體阻隔性能。此外，我們可以通過調整噴塗流速和次數來精確操縱氧化石墨烯膜的堆疊結構。從單一氣體分析來看，具有氧化石墨烯沉積的聚合物基材顯示出優異的氧氣阻隔性能，比純乙基纖維素膜降低了89%。;High oxygen barrier performance is one of the essential properties of the food packaging industry. Graphene oxide is a promising candidate for gas barrier materials due to two-dimensional carbon-based structure, high aspect ratio, and excellent mechanical strength. The outstanding aspect ratio from filler provide the more tortuous pathway to diffusing gas, resulting in the gas barrier properties is significantly increased. Graphene oxide membrane is crucial to control the thickness and stacking structures to achieve remarkable performance. In this work, the graphene oxide is synthesized by modified Hummer’s method from commercial graphite powder. Then, the facile surface coating method is presented by using layer by layer assembly, which is combined the spray-coating and solvent evaporation method to demonstrate a continuous and scalable process for synthesizing graphene oxide membranes on ethyl cellulose substrate to enhance gas barrier properties. Furthermore, the stacking structure of graphene oxide membrane is manipulated precisely by adjusting the flow rate and the number of coating times. From single gas analysis, the polymer substrate with graphene oxide deposition display excellent oxygen barrier properties, which is 89% decreasing than pure ethyl cellulose membrane.
