Dr Cinzia Casiraghi's Group: Graphene Publication

Graphene production based on exfoliation of graphite with organic dyes: effect of charge, dipole and molecular structure In Dr Cinzia Casiraghi’s groups’ recent publication (Yang et al, Carbon, DOI: 10.1016/j.carbon.2012.11.022) they have shown a simple and efficient method to produce high quality graphene in water.

Casiraghi Graphene Publication

Graphene production based on exfoliation of graphite with organic dyes: effect of charge, dipole and molecular structure

In Dr Cinzia Casiraghi’s groups’ recent publication (Yang et al, Carbon, DOI: 10.1016/j.carbon.2012.11.022) they have shown a simple and efficient method to produce high quality graphene in water. The method is based on the exfoliation of graphite in water by using organic dyes such as pyrene. In collaboration with the NRC Bologna, University of Mons, and ISIS/Université de Strasbourg, we have further investigated the effect of charge, dipole and molecular structure of the dyes on the exfoliation mechanism of graphite. Molecular dynamic calculation revealed that a critical role in the interaction of pyrene derivatives with graphene is played by the steric repulsions of the layer of solvent confined between molecule and graphene. This indicates that the molecular dipole is thus not important per se, but because it facilitates the “sliding” of the molecule into the solvent layer, and therefore the lateral displacement of the water molecules collocated between the aromatic cores of molecule and graphene. More info: Schlierf et al, Nanoscale, ASAP

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