Wide-Range Size Fractionation of Graphene Oxide by Flow Field-Flow Fractionation

Hee Jae Choi, Myoungjae Ko, In Ho Kim, Hayoung Yu, Jin Yong Kim, Taeyeong Yun, Joon Seon Yang, Geon Gug Yang, Hyeon Su Jeong, Myeong Hee Moon, Sang Ouk Kim

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1 Citation (Scopus)


Many interesting properties of 2D materials and their assembled structures are strongly dependent on the lateral size and size distribution of 2D materials. Accordingly, effective size separation of polydisperse 2D sheets is critical for desirable applications. Here, we introduce flow field-flow fractionation (FlFFF) for a wide-range size fractionation of graphene oxide (GO) up to 100 μm. Two different separation mechanisms are identified for FlFFF, including normal mode and steric/hyperlayer mode, to size fractionate wide size-distributed GOs while employing a crossflow field for either diffusion or size-controlled migration of GO. Obviously, the 2D GO sheet reveals size separation behavior distinctive from typical spherical particles arising from its innate planar geometry. We also investigate 2D sheet size-dependent mechanical and electrical properties of three different graphene fibers produced from size-fractionated GOs. This FlFFF-based size selection methodology can be used as a generic approach for effective wide-range size separation for 2D materials, including rGO, TMDs, and MXene.

Original languageEnglish
Pages (from-to)9172-9182
Number of pages11
JournalACS Nano
Issue number6
Publication statusPublished - 2022 Jun 28

Bibliographical note

Funding Information:
This work was supported by the Multi-Dimensional Directed Nanoscale Assembly Creative Research Initiative (CRI) Center (2015R1A3A2033061), the Hybrid Interface Materials Research Group (Global Frontier Project, 2013M3A6B1078874), and Grant No. NRF-2021R1A2C2003171 from the National Research Foundation (NRF) of Korea.

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

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


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