In order to improve the dispersion stability of graphene in solvents

2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC)-modified graphene composites (HACC-RGO) were prepared through the non-covalent electrostatic interaction between HACC and graphene oxide firstly and then the reduction by hydrazine.The structure and morphology of HACC-RGO were characterized by Fourier transform infrared spectroscopy

X-ray diffraction and Field emission scanning electron microscopy.These results showed that HACC was introduced successfully onto the graphene surface and inserted into the layers of graphene.TG test showed that the content of modifier HACC in HACC-RGO increased with the increasing amount of HACC.The zeta potential value of HACC-RGO increased and the particle size decreased with increasing amount of HACC.After modification by HACC

HACC-RGO could be dispersed well in aqueous solutions

and exhibited a good dispersion stability at the pH range from 2 to 9.The average particle size of HACC-RGO was the smallest in the solution of pH=7.The electrochemical properties of HACC-RGO were investigated by cyclic voltammetry.HACC-RGO had good electrical conductivity.With the increasing amount of HACC during the modification progress

the redox peak of [Fe(CN)6]3- at HACC-RGO/GCE increased.With the decreasing amount of hydrazine during the reduction progress

the redox peaks of [Fe(CN)6]3- at HACC-RGO/GCE decreased.