期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 33, 页码 21595-21602出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07272
关键词
graphene oxide; covalent functionalization; dispersion stability; quantitative assessment; ethylene glycol
资金
- National Research Foundation of Korea (NRF) [NRF-2014R1A2A1A11052829]
- Hyundai Motor Company [2.150078.01]
- Global Ph.D. Fellowship (GPF) - National Research Foundation of Korea (NRF) [NRF-2014H1A2A1018269]
- National Research Foundation of Korea [2014H1A2A1018269] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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