Preparation Technology and Characterization of Graphene

Graphene was prepared by improved Hummers method.The effects of reducing agent,reduction time,different reducing agents on the results of the experiment were studied.Tested by transmission electron microscopy,X-ray diffraction,laser particle size,infrared spectroscopy,thermal performance testing,the structure and the dispersion of graphite and graphene oxide ware analyzed,as well as their appearance.The results show that the regularity of graphite oxide is higher than graphene.And the space of graphite oxide layers is bigger.It turns out that aerobic group has a great influence on expanding the space of layers.Ultrasonic time affects stripping levels of graphite oxide.Thermal stability of graphene is higher than graphite oxide′s.The dispersion result of different kinds of graphene gained by different reducing agents is distinctive.Through infrared spectrum analysis,the graphene obtained by ethanediamine and ammonia reduction has new absorption.It indicates a new group is introduced,and graphene surface has chemical modification.