National Center for Nanoscience and Technology, China, Beijing 100190, PR China.
ACS Nano. 2011 Mar 22;5(3):2134-41. doi: 10.1021/nn103331x. Epub 2011 Feb 22.
High mechanical performances of macroscopic graphene oxide (GO) papers are attracting great interest owing to their merits of lightweight and multiple functionalities. However, the loading role of individual nanosheets and its effect on the mechanical properties of the macroscopic GO papers are not yet well understood. Herein, we effectively tailored the interlayer adhesions of the GO papers by introducing small molecules, that is, glutaraldehyde (GA) and water molecules, into the gallery regions. With the help of in situ Raman spectroscopy, we compared the varied load-reinforcing roles of nanosheets, and further predicted the Young's moduli of the GO papers. Systematic mechanical tests have proven that the enhancement of the tensile modulus and strength of the GA-treated GO paper arose from the improved load-bearing capability of the nanosheets. On the basis of Raman and macroscopic mechanical tests, the influences of interlayer adhesions on the fracture mechanisms of the strained GO papers were inferred.
宏观氧化石墨烯 (GO) 纸具有出色的机械性能，因其轻质和多功能的特点而备受关注。然而，其单层纳米片的负载作用及其对宏观 GO 纸机械性能的影响尚未得到很好的理解。在此，我们通过将小分子（即戊二醛 (GA) 和水分子）引入层间区域，有效地调整了 GO 纸的层间黏附力。借助原位拉曼光谱，我们比较了纳米片的不同负载增强作用，并进一步预测了 GO 纸的杨氏模量。系统的力学测试证明，GA 处理的 GO 纸的拉伸模量和强度的增强源于纳米片承载能力的提高。基于拉曼和宏观力学测试，推断了层间黏附力对拉伸 GO 纸断裂机制的影响。
