Journal
ACS NANO
Volume 5, Issue 3, Pages 2134-2141Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn103331x
Keywords
graphene oxide; mechanical properties; Raman spectroscopy; interlayer adhesion; strain transfer
Categories
Funding
- National Key Basic Research Program of China [2007CB936803]
- Ministry of Science and Technology of China [2008DFA51220]
- Chinese Academy of Sciences [KJCX2-YW-M01, KJCX2-YW-H21]
- National Natural Science Foundation of China [20874023, 51073044, 9102301]
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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.
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