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Kim, Byeong-Su
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Tailoring Graphene Nanosheets for Highly Improved Dispersion Stability and Quantitative Assessment in Nonaqueous Solvent

Author(s)
Park, MinjuSong, KyounghwaLee, TaeminCha, JinHyeokLyo, InWoongKim, Byeong-Su
Issued Date
2016-08
DOI
10.1021/acsami.6b07272
URI
https://scholarworks.unist.ac.kr/handle/201301/20426
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acsami.6b07272
Citation
ACS APPLIED MATERIALS & INTERFACES, v.8, no.33, pp.21595 - 21602
Abstract
Aggregation is a critical limitation for the practical application of graphene-based materials. Herein, we report that graphene oxide (GO) nanosheets chemically modified with ethanolamine (EA), ethylene glycol (EG), and sulfanilic acid (SA) demonstrate superior dispersion stability in organic solvents, specifically EG, based on the differences in their covalent chemistries. Functionalized GO was successfully dispersed in EG at a concentration of 9.0 mg mL-1 (0.50 vol %), the highest dispersion concentration reported to date. Moreover, our study introduces a unique analytical method for the assessment of dispersion stability and successfully quantifies the instability index based on transmission profiles under centrifugation cycles. Interestingly, GO-EG and GO-EA exhibited highly improved dispersion stabilities approximately 96 and 48 times greater than that of GO in EG solvent, respectively. This finding highlights the critical role of surface functional groups in the enhancement of chemical affinity and miscibility in the surrounding media. We anticipate that the novel structural designs and unique tools presented in this study will further the understanding and application of chemically functionalized carbon materials.
Publisher
American Chemical Society
ISSN
1944-8244
Keyword (Author)
graphene oxidecovalent functionalizationdispersion stabilityquantitative assessmentethylene glycol
Keyword
HETEROATOM-DOPED GRAPHENEEXFOLIATED GRAPHITE OXIDEOXYGEN REDUCTION REACTIONORGANIC-SOLVENTSAQUEOUS DISPERSIONSSHEETSFUNCTIONALIZATIONNANOPLATELETSNANOPARTICLESCOMPOSITE

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