Preparation Of Novel Graphene Functional Composites And Their Application In Polymer Performance Enhancement And Supercapacitors

The unique two-dimensional, conjugated plane structure of graphene endows it with many super properties and various applications in many areas. However, the large-scale synthesis of graphene and constructing of graphene macroscopic structures are still great challenges for researchers. Here we expanded the chemical reduction of graphene oxide method and prepared graphene/Cu nanoparticle composite films with high conductivity. Additionally, homo-telechelic functionalized polymers were tailored to enhance the interaction between polymer molecules and chemical reduced graphene oxide sheets. The main contents are as follows:Firstly, we prepared graphene/Cu nanoparticle composite films via in situ hybridization in which metal nanoparticles were presynthesized and GO was reduced in situ by Cu nanoparticles. In this procedure, Cu nanoparticles firstly played the role of reductant reducing GO to RGO. Then, the composite film fabricated via filtration showed high conductivity and flexibility. Furthermore, after Cu nanoparticles were etched, the highly porous structure of RGO can be used as electrodes for supercapacitors appeared. This green, safe, highly efficient and ultralow-cost approach of fabricating graphene/metal nanoparticle composites paves the way to large-scale commercial applications of graphene/metal nanoparticle composites.Furthermore, In current study the homo-telechelic functionalized polyethylene glycols(FPEGs) were tailored with ?-orbital-rich groups via esterification reactions, which enhanced the interaction between polyethylene glycol molecules and chemical reduced graphene oxide sheets. The formation of graphene network structure mediated by the FPEGs fillers via ?-? stacking non-covalent interactions should account for the experimental results. The experimental investigations were also complemented with theoretical calculation using a density functional theory. Atomic force microscope(AFM), scanning electron microscope(SEM), X-ray diffraction(XRD), nuclear magnetic resonance(NMR), thermal gravimetric analysis(TGA), UV-vis and fluorescence spectroscopy were used to monitor the step-wise preparation of polymer and graphene composite films.