Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 463, Issue -, Pages 63-69Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.09.024
Keywords
Graphene; Ionic liquid; pi-pi stacking; Conductivity
Categories
Funding
- National Science Foundation under CRIF-MU instrumentation grant [CHE-0840493]
- National Science Foundation under CAREER award [CMMI-1253085]
- Air Force Office of Scientific Research Young Investigator Program (AFOSR) [FA9550-11-1-0027]
- National Science Foundation [CHE-1153077, CHE-1048553]
- Robert A. Welch Foundation [D-0005]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1451756] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1153077] Funding Source: National Science Foundation
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Novel ionic liquids (ILs) were designed and synthesized to contain aromatic groups on the imidazolium cation that non-covalently interact with graphene surfaces. This route enables the dispersion of pristine graphene without covalent functionalization or an additive stabilizer; such dispersions are stable against aggregation and display high concentration values. We find that ILs without these aromatic groups are less effective in graphene dispersion, and the dispersed graphene concentration increases with increasing interaction between the cation and graphene surface. Density functional theory (DFT-D3) calculations support the experimental observations and provide a foundation for predictive modeling of IL design for optimal graphene dispersions. (C) 2014 Elsevier B.V. All rights reserved.
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