Publication date: 8th January 2019
Reduced graphene oxide (rGO) has similar mechanical, optoelectronic or conductive properties with pristine graphene as it possesses a heterogeneous structure composed of a pristine graphene-like basal plane with few topological defects and highly oxidized regions[1]. It is these properties that makes rGO a highly desirable material to be used in a large number of applications, including those based on multifunctional (polymer) nanocomposites as well as in various optoelectronic devices. Nonetheless, in order to reach the full potential of rGO, for example in optoelectronic devices, one has to overcome a great challenge that consist in finding an organic solvent that is good for (semiconducting) polymers and in which rGO can give a stable dispersion in rather high concentration. As the best organic solvents to disperse rGO are those with high boiling point and with a surface tension ~40 mJ m-2[2], we have chosen to prepare dispersions of rGO in high concentrations in N,N-dimethylformamide and o-dichlorobenzene. Additionally, results obtained with alternative solvent exchange methods and liquid phase exfoliation of graphite in organic solvents like toluene, chloroform and chlorobenzene will be discussed.
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