Synthesis Of Carbon Nanocages Composites And Theirs Application In Electrochemical Sensor

Carbon nanocages?CNCs?as a 3D size structure,because of its unique hollow structure,high specific surface area,low density,and graphite shell good thermal and chemical stability and electrical performance,it possessed great potential for application in the field of lithium ion battery materials,super capacitor,and fuel cell catalyst carrier.There are many kinds of synthetic methods for preparation of CNCs.Among so many methods,template method was extensive applicated due to its simple equipment,easy control,strong operability and high yield.The synthesis method of CNCs and application was based on full investigation in this paper.The main purpose of this paper is to exploit a simple and effective method for preparing CNCs,and develop the superior performance of the material to the field of chemical sensors for the first time,through the analysis of experimental results and the related literature.?1?In this study,we employed Fe₃O₄ as the template and ethanol as carbon source,through the sacrifice template method with acid to remove carbon layer coated Fe₃O₄ and thus the CNCs can be obtained.Transmission electron microscopy?TEM?is used to characterize surface morphology of CNCs,atomic force microscope?AFM?is conducted to chip thickness,X-ray diffraction?XRD?is measured to lattice structure,X-ray electron energy spectrum?XPS?is used to elements and chemical bonds combination,infrared spectroscopy?FT-IR?is carried out to characterize of surface functional groups.The obtained CNCs showed strong stability,good electrical conductivity,and through the?-?stack effect and the effect of van der Waals force to enhance the capacity of electric catalytic oxidation biological molecules.Nafion is a kind of perfluorinated sulfonated cation exchanger and it is mainly composed of fluorine carbon chain of linear backbone and ethyl ether side group exchange network with sulfonic acid type cation exchange resin.So far,due to its high mechanical strength,chemical and thermal stability,the Nafion still as a best performance cation exchange membrane,and Nafion can reduce or avoid the pollution effect of electrode,such as the electrochemical detection of phenolic compounds.Therefore,this study CNCs was used as fast electron transfer medium in the electrochemical detection of phenolic biological molecules.Experiments showed that the CNCs/Nafion biological probe with high sensitivity and selectivity,and was used for the actual determination of dopamine hydrochloride injection with a satisfactory conclusion.?2?Synthesis of CNCs composite material with gold nanoparticles?AuNPs@CNCs?,by using cyclic voltammetry and differential pulse voltammetry and other electrochemical methods to measure AuNPs@CNCs electrochemical properties of the composite material.Through electrostatic interactions synthetic and?-?accumulation to synthesis AuNPs@CNCs composite membrane,which can produce synergies thus to improve the sensitivity of electrochemical sensors that having high conductivity,such as electricity and selective oxidation properties.Using the modification on the electrode surface composite materials and application in the electrochemical detection of catechol and hydroquinone at the same time,the experimental results showed high sensitivity,wide linear range and low detection limit.In addition,the further modified electrodes used in the detection of the actual jiulong river estuary water samples,the satisfactory effect can be obtained.?3?Three-dimensional structure composite materials CNCs-RGO was synthesized by CNCs and graphene oxide by one step hydrothermal synthesis method.The morphology structure of the material was characterized by TEM,SEM,XRD and FT-IR.The CNCs-RGO composite material showed higher electrical conductivity than single CNCs and GO.Specialtily,the modification to the electrode surface and used for electrochemical detection of catechol and hydroquinone showed high sensitivity,wide linear range and low detection limit.