Structure and Morphology of Charged Graphene Platelets in Solution by Small-Angle Neutron Scattering
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- 作者：Emily M. Milner ; Neal T. Skipper ; Christopher A. Howard ; Milo S. P. Shaffer ; David J. Buckley ; K. Adam Rahnejat ; Patrick L. Cullen ; Richard K. Heenan ; Peter Lindner ; Ralf Schweins
- 刊名：The Journal of the American Chemical Society
- 出版年：2012
- 出版时间：May 23, 2012
- 年：2012
- 卷：134
- 期：20
- 页码：8302-8305
- 全文大小：274K
- 年卷期：v.134,no.20(May 23, 2012)
- ISSN：1520-5126
文摘
Solutions of negatively charged graphene (graphenide) platelets were produced by intercalation of nanographite with liquid potassium鈥揳mmonia followed by dissolution in tetrahydrofuran. The structure and morphology of these solutions were then investigated by small-angle neutron scattering. We found that >95 vol % of the solute is present as single-layer graphene sheets. These charged sheets are flat over a length scale of >150 脜 in solution and are strongly solvated by a shell of solvent molecules. Atomic force microscopy on drop-coated thin films corroborated the presence of monolayer graphene sheets. Our dissolution method thus offers a significant increase in the monodispersity achievable in graphene solutions.