Strengthening in Graphene Oxide Nanosheets: Bridging the Gap between Interplanar and Intraplanar Fracture

Nano Letters
Changhong CaoYu Sun

Abstract

Graphene oxide (GO) is a layered material comprised of hierarchical features which possess vastly differing characteristic dimensions. GO nanosheets represent the critical hierarchical structure which bridges the length-scale of monolayer and bulk material architectures. In this study, the strength and fracture behavior of GO nanosheets were examined. Under uniaxial loading, the tensile strength of the nanosheets was measured to be as high as 12 ± 4 GPa, which approaches the intrinsic strength of monolayer GO and is orders of magnitude higher than that of bulk GO materials. During mechanical failure, brittle fracture was observed in a highly localized region through the cross-section of the nanosheets without interlayer pull-out. This transition in the failure behavior from interplanar fracture, common for bulk GO, to intraplanar fracture, which dominates failure in monolayer GO, is responsible for the high strength measured in the nanosheets. Molecular dynamics simulations indicate that the elastic release from the propagation of intraplanar cracks initiates global fracture due to interlayer load transmission through hydrogen bond networks within the gallery space of the GO nanosheets. Furthermore, the GO nanosheet strength an...Continue Reading

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Citations

Jan 9, 2016·ACS Nano·Matthew DalyChandra Veer Singh
Jun 1, 2016·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Zheling LiRobert J Young
Jan 13, 2021·Nanoscale·Xianghui Zhang, André Beyer
Jan 20, 2018·ACS Applied Materials & Interfaces·Sankha MukherjeeChandra Veer Singh
Jan 27, 2018·ACS Applied Materials & Interfaces·Mingmao WuGaoquan Shi
Jan 6, 2021·ACS Applied Materials & Interfaces·Guorui WangZhong Zhang

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