Studies On Synthesis And Properties Of The Composite Of Zinc Oxide/Graphene Oxide

Graphene sheets (G), two-dimensional one-atom-thick layers of sp2-bonded carbon, are similar to the unrolled one-dimensional carbon nanotubes, graphene oxide (GO) is a typical two-dimensional layered nanomaterial with plenty of functional groups (such as hydroxyl, carboxyl, carbonyl, epoxy groups) on its surface, since G come out in 2004, It has been caused widespread concern in many fields. Owing to unique physical properties, G and GO have exhibited promising applications in many fields such as sensors, catalysis and electrics. Zinc oxide, a well known semiconductor with a wide band gap of 3.37 eV, can be widely used in photoelectric field. In this article, we will make ZnO combinate with GO films and G, the composites may result in improved electrochemical properties.(1) Graphite oxide was prepared by Hummers method, and then was subjected to ultrasonic treatment in the solvents to prepare graphene oxide. Composites were characterized by using the scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD).(2) The flower-like ZnO has been deposited on the surface of GO films by using the thermal aqueous method. The morphologies of the as-obtained ZnO deposited on the graphene oxide layer are characterized by using scan electron microscope (SEM), X-ray powder diffraction (XRD) and photoluminescence (PL). The formation mechanism of the flower-like ZnO has been investigated. The results show that the morphology of the finally-obtained ZnO is tunable by seeds, the concentration of growing solution and the reaction time.(3) Zinc Oxide/Graphene were successfully synthesized by using the thermal aqueous method and electrodepositing, the charge-discharge performance of the samples which was synthesized using the thermal aqueous method was investigated by constant current and cyclic voltammetry methods, The results indicate that the as-obtained composites ZnO/G have a superor specific-capacitance than G individual component, The cyclic voltammetry test shows the ZnO/G has good double layer electrical performance.