Graphene Oxide Nanoribbon Hydrogel: Viscoelastic Behavior and Use as a Molecular Separation Membrane

Yunkyu Choi, Sung Soo Kim, Ji Hoon Kim, Junhyeok Kang, Eunji Choi, Seung Eun Choi, Jeong Pil Kim, Ohchan Kwon, Dae Woo Kim

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24 Citations (Scopus)


The preparation of carbon materials based hydrogels and their viscoelastic properties are essential for their broad application and scale-up. However, existing studies are mainly focused on graphene derivatives and carbon nanotubes, and the behavior of graphene nanoribbon (GNR), a narrow strip of graphene, remains elusive. Herein, we demonstrate the concentration-driven gelation of oxidized GNR (graphene oxide nanoribbon, GONR) in aqueous solvents. Exfoliated individual GONRs sequentially assemble into strings (∼1 mg/mL), nanoplates (∼20 mg/mL), and a macroporous scaffold (50 mg/mL) with increasing concentration. The GONR hydrogels exhibit viscoelastic shear-thinning behavior and can be shear-coated to form large-area GONR films on substrates. The entangled and stacked structure of the GONR film contributed to outstanding nanofiltration performance under high pressure, cross-flow, and long-term filtration, while the precise molecular separation with 100% rejection rate was maintained for sub-nanometer molecules.

Original languageEnglish
Pages (from-to)12195-12202
Number of pages8
JournalACS Nano
Issue number9
Publication statusPublished - 2020 Sept 22

Bibliographical note

Funding Information:
This research was supported by basic science research programs through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2015R1A6A3A04057367, NRF-2019R1A6A1A1105566012). This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2020R1C1C1003289). This research was supported by an internal grant (code: 20200543) form the Korea Institute of Civil Engineering and Building Technology (KICT).

Publisher Copyright:
Copyright © 2020 American Chemical Society.

All Science Journal Classification (ASJC) codes

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


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