Preparation And Properties Of Functional Graphene-based Conductive Devices

With the growing demand for energy,it is very important for people to develop high-performance and durable electronic devices.In this paper,we focus on functionalized graphene,and prepare supercapacitors and conductive sensors with good performance.The specific work is as follows.First,we used the template method to prepare a high energy density,high power density supercapacitor.Graphene is a new type of two-dimensional material.It is a promising material because of its unique and excellent performance.However,the strong?-?interaction of graphene inhibits its own application.Here,we provide a new method using amino-functionalized silica as both a template and a dopant to prevent the build-up of graphene sheets.The microstructure and chemical composition of the prepared nitrogen-doped redox graphene?RGO?aerogels were studied by scanning electron microscopy,transmission electron microscopy,X-ray diffraction,Raman spectroscopy,and X-ray photoelectron spectroscopy.The measurement results show that the content of amino-functionalized silica?SiO₂-NH₂?has a profound influence on the specific surface area and carbon activity of the graphene aerogel.Due to its large surface area of 481.8 m² g^-1,low series resistance and high nitrogen doping content,the prepared three-dimensional layered porous nitrogen-doped RGO aerogel electrode shows excellent electrochemical performance in aqueous and organic electrolytes.It has an ultra-high capacitance of 350 F g^-11 at a current density of 1 A g^-1,and excellent cycle performance and 88%cycle efficiency after 10000 charge-discharge cycles.In addition,N-doped RGO aerogels also have high oil absorption and recyclability.Second,we prepared conductive sensors with self-healing properties.Since the self-healing material can increase the service life of the material and reduce the cost during the use,it has attracted wide attention.In this paper,we prepared a polymer hydrogel with self-healing properties and used a method of in-situ polymerization to combine a self-healing polymer hydrogel with a graphene aerogel.The mechanical properties,self-healing properties and electrochemical properties of graphene/polymer composites were studied through a series of tests.And the graphene/polymer composites can be developed further to conductive devices.It has potential application prospects in the self-healing sensor.