Papers

Nov, 2021

Bulk-scale synthesis of randomly stacked graphene with high crystallinity

CARBON
  • Zizhao Xu
  • ,
  • Shingo Nakamura
  • ,
  • Taiki Inoue
  • ,
  • Yuta Nishina
  • ,
  • Yoshihiro Kobayashi

Volume
185
Number
First page
368
Last page
375
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1016/j.carbon.2021.09.034
Publisher
PERGAMON-ELSEVIER SCIENCE LTD

Since the strong interlayer interaction of AB-stacked graphene in bulk form degrades the superior property of single-layer graphene, formation of randomly stacked graphene is required to apply the high performances of graphene to macroscopic devices. However, conventional methods to obtain bulk-scale graphene suffer from a low crystallinity and/or the formation of a thermodynamically stable AB-stacked structure. This study develops a novel approach to produce bulk-scale graphene with a high crystallinity and high fractions of random stacking by utilizing the porous morphology of a graphene oxide sponge and an ultrahigh temperature treatment of 1500-1800 degrees C with ethanol vapor. Raman spectroscopy indicates that the obtained bulk-scale graphene sponge possesses a high crystallinity and a high fraction of random stacking of 80%. The large difference in the random-stacking ratio between the sponge and the aggregate samples confirms the importance of accessibility of ethanol-derived species into the internal area. By investigating the effect of treatment temperature, a higher random-stacking ratio is obtained at 1500 degrees C. Moreover, the AB-stacking fraction was reduced to less than 10% by introducing cellulose nanofiber as a spacer to prevent direct stacking of graphene. The proposed method is effective for large-scale production of high-performance bulk-scale graphene. (C) 2021 Elsevier Ltd. All rights reserved.

Link information
DOI
https://doi.org/10.1016/j.carbon.2021.09.034
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000701978600006&DestApp=WOS_CPL
ID information
  • DOI : 10.1016/j.carbon.2021.09.034
  • ISSN : 0008-6223
  • eISSN : 1873-3891
  • Web of Science ID : WOS:000701978600006

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