Preparation Of Copper Nanoparticles Coated With Graphene-Like And The Study Of Electrical Conductivity

Since the birth of graphene,it has been widely studied in the field of new materials due to its unique two-dimensional structure of SP² hybrid network.In recent years,composite nanostructures consisting of graphene and metal nanostructures have attracted considerable attention due to their enhanced interaction between light and matter.It has broad application prospects in the fields of photonics,photoelectronics,conductive materials,electronic and photoelectronic devices,chemical sensors and energy storage devices.In this paper,copper oxide（CuO）and liquid acrylonitrile oligomer（LPAN）were used as raw materials,liquid acrylonitrile oligomer（LPAN）as carbon source and reducing agent,and graphene-like copper nanoparticles were prepared by ball milling and calcination at high temperature.The preparation of graphene-like copper nanomaterials not only maintains good conductivity and catalytic activity of copper,but also has good antioxidant activity.Compared with precious metals,copper has competitive advantages such as low cost,high conductivity and low electromigration resistance.However,when copper is prepared into nanoparticles,its specific surface area increases,and its chemical activity becomes more active.It is easy to be oxidized in air to form non-conductive Cu₂O or CuO.Graphene-like act as an optical thin oxidation barrier on the unoxidized metal surface to protect copper from oxidation while minimizing changes in optical or electrical properties.Therefore,graphene-like coated copper nanoparticles can effectively improve the performance and oxidation resistance of nano-copper powder.It is mainly used in the field of conductive materials and has broad application prospects.This article mainly from the following aspects to explore.（1）The preparation of composite particles by planetary ball mill and high temperature calcination process was studied.When deionized water and ethanol were used as dispersing media,the effects of different ratios of copper oxide（CuO）and liquid acrylonitrile oligomer（LPAN）and calcination temperature on the morphology,crystal structure and properties of the prepared composite particles were investigated by various characterization methods.（2）Drum ball mill is used for ball milling,water and ethanol were used as two different dispersing media.Liquid acrylonitrile oligomer（LPAN）as carbon source and reducing agent of copper oxide.The effects of reaction conditions such as different ratio of copper oxide（CuO）and liquid acrylonitrile oligomer（LPAN）and sintering temperature on the structure,morphology and properties of graphene-like coated copper nanoparticles were systematically studied by different characterization methodsunder different preparation schemes.（3）When planetary ball mill and Drum ball mill are used for ball milling,the graphene-like coated copper nanoparticles synthesized in different solvents have similar structure and obvious core-shell structure.Copper core is coated with multilayer graphene-like.With the increase of sintering temperature,the order degree of coated carbon nanostructures increases.When the optimum carbon content is selected and prepared at 1000℃,the crystallinity of the composite particles is the highest and the resistivity is the lowest,reaching about 10^-5Ω·cm.The conductivity of the composite particles is good.Over 1000℃the carbon layer coated by the outer layer has obvious multi-layer graphene structure.However,when the temperature exceeds the melting point of copper at 1083.4℃,copper and carbon are annealed to form a carbon-copper composite,which affects the crystallinity and conductivity of the composite particles.