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

Authors :
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
Source :
ACS nano. 16(6)
Publication Year :
2022

Abstract

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.

Details

ISSN :
1936086X
Volume :
16
Issue :
6
Database :
OpenAIRE
Journal :
ACS nano
Accession number :
edsair.doi.dedup.....b0ddbea79bb2535856a5b12214469362