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Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite

The electrochemical exfoliation of graphite has been considered to be an effective approach for the mass production of high-quality graphene due to its easy, simple, and eco-friendly synthetic features. However, water dispersion of graphene produced in the electrochemical exfoliation method has also...

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Autores principales: Park, Si-Woo, Jang, Byungkwon, Kim, Han, Lee, Jimin, Park, Ji Young, Kang, Sung-Oong, Choa, Yong-Ho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8335538/
https://www.ncbi.nlm.nih.gov/pubmed/34368080
http://dx.doi.org/10.3389/fchem.2021.699231
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author Park, Si-Woo
Jang, Byungkwon
Kim, Han
Lee, Jimin
Park, Ji Young
Kang, Sung-Oong
Choa, Yong-Ho
author_facet Park, Si-Woo
Jang, Byungkwon
Kim, Han
Lee, Jimin
Park, Ji Young
Kang, Sung-Oong
Choa, Yong-Ho
author_sort Park, Si-Woo
collection PubMed
description The electrochemical exfoliation of graphite has been considered to be an effective approach for the mass production of high-quality graphene due to its easy, simple, and eco-friendly synthetic features. However, water dispersion of graphene produced in the electrochemical exfoliation method has also been a challenging issue because of the hydrophobic properties of the resulting graphene. In this study, we report the electrochemical exfoliation method of producing water-dispersible graphene that importantly contains the relatively low oxygen content of <10% without any assistant dispersing agents. Through the mild in situ sulfate functionalization of graphite under alkaline electrochemical conditions using a pH buffer, the highly water-dispersible graphene could be produced without any additional separation processes of sedimentation and/or centrifugation. We found the resulting graphene sheets to have high crystalline basal planes, lateral sizes of several μm, and a thickness of <5 nm. Furthermore, the high aqueous dispersion stability of as-prepared graphene could be demonstrated using a multi-light scattering technique, showing very little change in the optical transmittance and the terbiscan stability index over time.
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spelling pubmed-83355382021-08-05 Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite Park, Si-Woo Jang, Byungkwon Kim, Han Lee, Jimin Park, Ji Young Kang, Sung-Oong Choa, Yong-Ho Front Chem Chemistry The electrochemical exfoliation of graphite has been considered to be an effective approach for the mass production of high-quality graphene due to its easy, simple, and eco-friendly synthetic features. However, water dispersion of graphene produced in the electrochemical exfoliation method has also been a challenging issue because of the hydrophobic properties of the resulting graphene. In this study, we report the electrochemical exfoliation method of producing water-dispersible graphene that importantly contains the relatively low oxygen content of <10% without any assistant dispersing agents. Through the mild in situ sulfate functionalization of graphite under alkaline electrochemical conditions using a pH buffer, the highly water-dispersible graphene could be produced without any additional separation processes of sedimentation and/or centrifugation. We found the resulting graphene sheets to have high crystalline basal planes, lateral sizes of several μm, and a thickness of <5 nm. Furthermore, the high aqueous dispersion stability of as-prepared graphene could be demonstrated using a multi-light scattering technique, showing very little change in the optical transmittance and the terbiscan stability index over time. Frontiers Media S.A. 2021-07-21 /pmc/articles/PMC8335538/ /pubmed/34368080 http://dx.doi.org/10.3389/fchem.2021.699231 Text en Copyright © 2021 Park, Jang, Kim, Lee, Park, Kang and Choa. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Park, Si-Woo
Jang, Byungkwon
Kim, Han
Lee, Jimin
Park, Ji Young
Kang, Sung-Oong
Choa, Yong-Ho
Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite
title Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite
title_full Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite
title_fullStr Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite
title_full_unstemmed Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite
title_short Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphite
title_sort highly water-dispersible graphene nanosheets from electrochemical exfoliation of graphite
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8335538/
https://www.ncbi.nlm.nih.gov/pubmed/34368080
http://dx.doi.org/10.3389/fchem.2021.699231
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