Tailoring Graphene Nanosheets for Highly Improved Dispersion Stability and Quantitative Assessment in Nonaqueous Solvent

Minju Park, Kyonghwa Song, Taemin Lee, Jinhyeok Cha, Inwoong Lyo, Byeong Su Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)21595-21602
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number33
DOIs
Publication statusPublished - 2016 Aug 24

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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