We report a graphene oxide (GO)-based composite, featuring GO/cross-linking agent (CA) nanoparticles, inspired by a nacre-like hierarchical structure present in nature. The as-prepared GO/CA composite was powdered to nanoscale particles and then mixed with pure GO to be GO/CA/GO (GCG) composite forming hierarchical GO/CA nanoasperities on the GO surface. The strength and toughness of the nacre-inspired GCG composite films were simultaneously improved by adjusting the nanoparticle concentration and hierarchical level of the GO-based films. Compared to pristine GO films and GO/CA composites, which exhibit a low level of hierarchy in their structures, the tensile strength and toughness of the GCG composites with higher hierarchy were enhanced 3.1 and 1.6 times and 47.6 and 10.9 times, respectively. Furthermore, a plausible mechanism of increasing mechanical properties based on nanoscale asperities and homogeneous interactions between GO and CA has been discussed.
Bibliographical noteFunding Information:
This work was supported by Korea University and NRF of Korea (2021R1A2B5B03001811, 2021R1A2C1010039, 2022M3C1A3081178, and 2021R1A2C2012958). It is also noted that this work was supported by measurement of the KBSI SEM facility at Seoul in Korea.
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- cross-linking agent
- graphene oxide
- hierarchical structure
- mechanical properties
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)