Preparation, Characterization And Applications Of Graphene-Based Nanocomposites

Graphene, one atom-thick nano-material, which was founded as a new type of two dimensions in carbon family since 2004. There are many special features along with graphene, such as extremely high surface area, fast electrons transfer, excellent elastic and mechanical advantages, and outstanding thermal property. All of these great properties make graphene a very potential material, and at the same time, graphene materials are playing an important role on being applied in every commercal business fields. However, pure graphene materials, are very easy to be aggregated with themselves during technical preparations, which lead to the hot research of graphene-based materials. Graphene-based materials are able to not only make full use of graphene, but also let the fillers show their own advantages. Graphene-based materials have been reported for many types of different devices numerously in recent years, such as field-effect transistors, transparent electrodes, organic photovoltaic devices, lithium-ion batteries, super capacitors, bio sensors and gas storages. Also such materials often break the best records they have ever made.This article is meant to study on the nano-composites, which is combining with the outer metal oxide nano-particals and outer conducting polymers, on the base of the huge surface area and outstanding electrons transfer properties of the matrix graphene. These nano-composites could be used for the better perfomances in environmental applications and supercapacitors. The main content of our research could be listed in two aspects.Firstly, magnetic-graphene material could be prepared with the stable amido links, through combining carboxyl groups of the edge of graphene oxide with the amino-groups decorated on the surface of Fe3O4. This nano-composite is used to dye pollutants removal in the drinking water, especially without the restriction of pH value. Moreover, the dye pollutants which have been adsorbed on the graphene are able to be decomposed under the sun light. The innovation here is that such material can be recycled in its efficient state. Later the characterizations of the nanocomposite are made, such as TEM, TGA, XRD and Magnetic Loops.Secondly, graphene/polymer nano-composite is prepared by reduction reaciton in situ, through combining graphene oxide with 4T-Py. This composite is used for supercapacitor electrodes. The innovation here is that the morphology of graphene can be influenced by polymer in the composite. The more proportion of 4T-Py, the larger morphology change of graphene. Moreover, the electrons are getting through different interfaces fast, which in conclusion, the material is affording the high specific capacitance and good cycling stability during the charge-discharge process. The composite here, not only makes full use of graphene, but also shows the conducting feature of polymer. This extremely novel structure of composite, is now, a very potentional supercapacitor electrode material.