A chemical modification process was developed to functionalize graphene with specific groups. Graphene oxide (GO) was successfully functionalized with thionyl bromide which can be used as precursors for further functionalization. Amino terminated-polyethylene glycol (PEG-NH2) molecules were linked to single-layer graphene sheets through covalent bond. FT-IR, SEM and UV-vis spectroscopy techniques were used to characterize PEG modified graphene oxide and PEG modified reduced graphene oxide (PEG-RG). PEG-RG could disperse in water, tetrahydrofuran and ethylene glycol, with individual, single-layer graphene sheets spontaneously. The dispersion behavior of PEG-RG in an aqueous solvent has been investigated. A series of solutions of PEG-RG with concentrations of 0.001% to 1.5% were prepared and the PEG-RG dispersions exhibited long-term stability. In addition, a PEG-RG film with layered structure and high conductivity has been successfully prepared by filtration.
|Title of host publication||Large-Area Electronics from Carbon Nanotubes, Graphene, and Related Noncarbon Nanostructures|
|Number of pages||7|
|State||Published - 1 Dec 2010|
|Event||2009 MRS Fall Meeting - Boston, MA, United States|
Duration: 30 Nov 2009 → 4 Dec 2009
|Other||2009 MRS Fall Meeting|
|Period||30/11/09 → 4/12/09|