期刊
ACS NANO
卷 16, 期 6, 页码 8869-8880出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c10561
关键词
graphene oxide; mechanical performances; assembly behavior; stacking order; hydrogen-bonding networks
类别
资金
- National Natural Science Foundation of China [51922020, U1905217, 52090034]
- Fundamental Research Funds for the Central Universities [BHYC1707B]
This study demonstrates a chemical-structure-engineering strategy to achieve highly aligned graphene oxide (GO) films with improved mechanical properties. The favorable assembly pattern of modified GO sheets is attributed to reduced interfacial friction on the atomic scale, allowing for freer configuration adjustment during the assembly process.
Mechanical-electrical properties of macroscopic graphene films derived from graphene oxide (GO) sheets are substantially restricted by their surface wrinkles and structural misalignment. Herein, we propose a chemical-structure-engineering strategy to realize the spontaneously regular stacking of modified GO (GO-m) with trace carboxyl. The highly aligned GO-m film delivers a fracture strength and modulus of nearly 3- and 5-fold higher than a wrinkled film with conventional Hummer's method derived GO (GO-c). The favorable assembly pattern of GO-m sheets is attributed to their decreased interfacial friction on the atomic scale, which weakens their local gelation capability for freer configuration adjustment during the assembly process. The chemical structure of GO-m can be further engineered by an epoxide-to-hydroxyl reaction, achieving a record high tensile strength of up to 631 MPa for the pristine GO film. By exploring the relationship between the surface terminations of GO and its stacking mode, this work proves the feasibility to realize high-performance macroscopic materials with optimized microstructure through the chemical modulation of nanosheet assembly.
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