(217ec) Three-Dimensional Graphene Network Produced By Organic Synthesis
In order to achieve “3-D” graphene materials, various physical and chemical methods were adopted and investigated. Hydrothermal reduction is so far the most common method. Here we reported a simple organic synthetic method by using 1,8-octyldiamine to react with the carboxyl and/or epoxy group on graphene oxide so that the stronger covalent bond replaced van der Waals force to hold graphene layers together. The novel “3-D” graphene type materials were characterized by various analytical equipments such as, scanning electron microscopes (SEM), transmission electron microscopies (TEM), X-ray diffraction (XRD), thermo gravimetric analysis (TGA), Raman and electrical conductivity measurements. Comparing to previous publications, the novel “3-D” graphene materials has many advanced features in terms of high surface areas, high electric and thermal conductivities, superior mechanical performance, easy in process along with a low production cost, and convernecy in scale up, which should be very attractive to the industrial applications. The temperature effect on the density of cell morphology was also studied. The cells tend open at lower temperature and close at higher temperature.