Highly Water-Dispersible Graphene Nanosheets From Electrochemical Exfoliation of Graphiteopen access
- Authors
- Park, Si-Woo; Jang, Byungkwon; Kim, Han; Lee, Jimin; Park, Ji Young; Kang, Sung-Oong; Choa, Yong-Ho
- Issue Date
- Jul-2021
- Publisher
- Frontiers Media S.A.
- Keywords
- graphene; water dispersion; sulfate functionalization; electrochemical exfoliation; edge functionalization
- Citation
- Frontiers in Chemistry, v.9, pp 1 - 8
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- Frontiers in Chemistry
- Volume
- 9
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/116256
- DOI
- 10.3389/fchem.2021.699231
- ISSN
- 2296-2646
- Abstract
- 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 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 mu m, 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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