Direct exfoliation of graphene in ionic liquids with aromatic groups

Rozana Bari; George Tamas; Fahmida Irin; Adelia J.A. Aquino; Micah J. Green; Edward L. Quitevis

doi:10.1016/j.colsurfa.2014.09.024

Direct exfoliation of graphene in ionic liquids with aromatic groups

Rozana Bari, George Tamas, Fahmida Irin, Adelia J.A. Aquino, Micah J. Green, Edward L. Quitevis

Chemistry and Biochemistry

Research output: Contribution to journal › Article

28 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	63-69
Number of pages	7
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	463
DOIs	https://doi.org/10.1016/j.colsurfa.2014.09.024
State	Published - Dec 5 2014

Keywords

Conductivity
Graphene
Ionic liquid
π-π stacking

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10.1016/j.colsurfa.2014.09.024

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title = "Direct exfoliation of graphene in ionic liquids with aromatic groups",

abstract = "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.",

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AU - Bari, Rozana

AU - Tamas, George

AU - Irin, Fahmida

AU - Aquino, Adelia J.A.

AU - Green, Micah J.

AU - Quitevis, Edward L.

PY - 2014/12/5

Y1 - 2014/12/5

N2 - 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.

AB - 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.

KW - Conductivity

KW - Graphene

KW - Ionic liquid

KW - π-π stacking

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