With the aid of poly(sodium 4-styrenesulfonate) (PSS)

a facile one-step method of producing stable hydrosoluble dispersion of reduced graphene oxide is reported. The prepared dispersion was very stable and no aggregation or precipitation was observed for several weeks. The obtained nanosheets were characterized by various diagnostic techniques. The results by scanning electron microscopy (SEM) and UV-Vis spectrum showed that PSS was tightly attached to the reduced graphene oxide and the hydrophilicity of graphene was greatly improved. Fourier transform infrared spectroscopy (FTIR) spectrum indicated the existence of O=S=O groups in PSS. X-Ray photoelectron spectroscopy (XPS) spectrum provided further evidence about the C/S atomic ratio and sulfur-bonded carbon atoms from PSS. The results shown in this study proved that this PSS-coated reduced graphene oxide could be implemented in graphene-based composites.