Synthesis Of Graphene Film Composites And Theirs Application A Of Electrochemical Sensors

Graphene oxide materials because of its unique mechanical,electricaloptical and properties,have potential value and broad application prospect in many areas,and research of nanometer carbon composite material is the best means to achieve its potential application value.In this paper,based on graphene have a unique electrical properties,thermal properties,mechanical strength,large specific surface area,etc.The carbon atoms of graphene packed into a dense honeycomb crystal strueture,which has attracted tremendous the scientific attention since the graphene was found in 2004,which filled the vacancies in the carbon material family of two-dimensional structure such that carbon nanomaterials from zero-dimensional,one-dimensional,two-dimensional to three-dimensional form a complete system.Graphene has applied in many field such as optical,electrical,catalytic energy storage,biosensors and so on.Graphene oxide?GO?was synthesized by oxidation of graphite using Hummers' method.superior performance and can quickly homogeneous transmission electron.after the graphene oxide as the precursor and graphene-based composite modified electrodes were prepared.graphene-based composite were used for the determination of electrochemical analysis.Some novel electrochemical sensors were constructed.The main contents are as follows:?1?We preparation of graphene oxide film by Potassium permanganate?KMnO₄?,sulfuric acid?H₂SO₄?and sodium nitrate?NaNO₃?,the edge and the surface of the graphene oxide modified the hydroxyl,carboxyl,epoxy and other hydrophilic groups.The cupric oxide?CuO?and reducted graphene oxide?r-GO?composite was prepared by the monowave technique.Scanning electron microscope,Transmission electron microscopy were employed to characterize the surface morphology.X-ray diffraction was performed to estimate the lattice structure.The BET were employed to characterize the porosity.Most importantly,CuO/r-GO biosensor was highly stable characteristics and can be manufactured into long-term stability electrode for the complicated circumstances.All these results confirm that this modified biosensor is a promising active material for detection glucose.?2?A simple and highly sensitive sensor was researched for the simultaneous detection of hydroquinone?HQ?,catechol?CC?and resorcinol?RC?based on carbon dots/reduced graphene oxide composite?CDs/r-GO?on the modified glassy carbonelectrode.Scanning electron microscope,Transmission electron microscopy were employed to characterize the surface morphology.Atomic force microscope was carried out to characterize the thickness of composites.The functional groups were further characterized by FT-IR,UV-vis and fluorescence spectroscopy.The carbon dots had carboxyl groups with negative charge,which not only provided good stability,but also enabled interaction and electron communication between r-GO and CDs can be further strengthened via ?-? stacking and electrostatic interactions.It exhibited distinguished sensitivity,wide linear range and low detection limit.Moreover,the composites modified sensor has successfully applied in detecting the practical samples.?3?The sandwiched film of cadmium sulphide/reduced graphene oxide?CdS/r-GO?was synthesized via hydrothermal reaction and the CdS/r-GO modified electrode was successfully used to detection of hydroquinone isomers.In addition,the charge transfer coefficient???and the electron transfer rate constant?ks?were calculated.Differential pulse voltammetry?DPV?was used for the simultaneous determination of HQ,CC and RC.In addition,the composites modified sensor was also successfully applied to detect practical samples.