Nacre-Mimetic Graphene Oxide/Cross-Linking Agent Composite Films with Superior Mechanical Properties

Ju Yeon Woo, Jun Ho Oh, Sunghwan Jo, Chang Soo Han

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


We report a graphene oxide/cross-linking agent (GO/CA) composite inspired by the nacre structure. Based on the "brick-and-mortar" concept of nacre, graphene oxide and a cross-linking agent are covalently conjugated in the form of nacre. The mechanical characteristics of the nacre-mimetic GO/CA composite film can be controlled by adjusting the preparation method, degree of cross-linking, and cross-linking times. As a result, the cross-linking strategy can drastically enhance the tensile strength [142.9 ± 6.4 MPa (∼2.3-fold)], modulus [4.7 ± 0.36 GPa (∼15.7-fold)], and hardness [917.4 ± 85.7 MPa (∼9.0-fold)], which are superior to those of pristine materials. The cross-linking agent-based chemical bonding method for mechanically improved integration is mainly attributed to the formation of strong cross-linked networks between the GO-based 2D interfaces and CA. The facile fabrication process provides many opportunities to design advanced, robust, and integrated nacre-like GO/CA composites, which can be applied to future aerospace utilizations, electronic protectors, robotic elements, and permeable membranes.

Original languageEnglish
Pages (from-to)4522-4529
Number of pages8
JournalACS nano
Issue number4
Publication statusPublished - 2019 Apr 23

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program (Grant No. 2018R1A2A1A05023556) through the National Research Foundation funded by the Ministry of Science and ICT and Korea University Grant, Korea.

Publisher Copyright:
© 2019 American Chemical Society.


  • composite
  • cross-linking agent
  • graphene oxide
  • mechanical properties
  • nanomimetic

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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