Type

Journal Article

Authors

Sukanta De
Arlene O'Neill
Mustafa Lotya
Umar Khan
Jonathan Nesbit Coleman

Subjects

Physics

Topics
spectrum analysis raman time factors low power graphene dispersions sonication solvent exfoliation raman spectroscopy carbon centrifugation size chemistry physics solvents water microscopy electron transmission graphene particle size stress mechanical

High-Concentration Solvent Exfoliation of Graphene. (2010)

Abstract We demonstrate a method to prepare graphene dispersions at high concentrations, up to 1.2 mg/ml, with yields of up to 4wt% monolayers. This process relies on low-power sonication for long times, up to 460 hours. TEM shows the sonication to reduce the flake size with flake dimensions scaling as t-1/2. However, the mean flake length remains above 1 mm for all sonication times studied. Raman spectroscopy shows defects are introduced by the sonication process. However, detailed analysis suggests that predominately edge rather then basal-plane defects are introduced. We have used these dispersions to prepare high quality free-standing graphene films. The dispersions can be heavily diluted by water without sedimentation or aggregation. This method facilitates graphene processing for a range of applications.
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Full list of authors on original publication

Sukanta De, Arlene O'Neill, Mustafa Lotya, Umar Khan, Jonathan Nesbit Coleman

Experts in our system

1
Arlene O'Neill
Trinity College Dublin
Total Publications: 25
 
2
Mustafa Lotya
Trinity College Dublin
Total Publications: 19
 
3
Umar Khan
Trinity College Dublin
Total Publications: 37
 
4
Jonathan Coleman
Trinity College Dublin
Total Publications: 217