Preparation And Performance Study Of The Copper Nanowires--Derived Nanomaterials

Copper nanowires?Cu NWs?have attracted wide attention due to their low cost,high abundance and many potential applications such as transparent electrodes,sensors,and solar cel s.Recently,Cu NWs have been attempted to use as precursor/template for the preparation of Cu NWs-derived new nanomaterials,which are expected to possess some new functions and applications.This thesis focuses on the prepation and application of Cu NWs-derived materials.We first prepared high-quality Cu NWs and Cu/Ni NWs by liquid phase reduction method.Then,we synthet ized branched copper oxide nanostructure and ZIF-67@Cu/Ni NWs using of Cu NWs and Cu/Ni NWs as the template,respectively.Finally,we studied the electrochemical performance of branched copper oxide as anode material for lithium ion battery and the adsorption properties of ZIF-67@Cu/Ni NWs for methyl blue.The specific research and results are listed as following:?1?We prepared Cu NWs by liquid phase reduction method and make Cu NWs oxidize to branched copper oxide nanostructure in high oxygen environment.Moreover,we realized the preparation of the needlelike branch structure and the sheet branch structure by regulating the reaction conditions.The electrochemical performance of branched copper oxide as anode material for lithium ion battery was studied.It was found that the specific surface and the content of copper oxide have great influence on the stability of circulation and capacity of the battery.The batteries tend to have better cycle stability and higher capacity with the higher amount of copper oxide and larger specific surface.The needlelike branch copper oxide shows good electrochemical performance and the battery capacity can still remain 450 mAhg^-1after 100 times at a constant current density of 2 C.The branched nanostructure can shorten the transmission path of Li⁺effectively and restrain the great changes in volume during the process of charging and discharging because of its branched skeleton structure.?2?ZIF-67@Cu/Ni NWs were prepared by making the metal-organic framework ZIF-67 grow on the surface of Cu/Ni NWs.And then we studied the adsorptive properties of ZIF-67@Cu/Ni NWs used for adsorbing methyl blue.The influence of pH value,adsorption time,amount of ZIF-67@Cu/Ni NWs on the performance of adsorption were investigated.The optimized adsorption conditions were measured to be pH=4,adsorption time t=10 min.Methyl blue of 7.8 g could be adsorbed using only 1 g ZIF-67@Cu/Ni NWs.Furthermore,we study the morphology,structure and the adsorption performance of the ZIF derived carbon@Cu/Ni NWs obtained by calcining ZIF-67@Cu/Ni NWs at different temperatures.It was found that the ZIF derived carbon@Cu/Ni NWs obtained at 500?have good cycle adsorbing performance for methyl blue.In the optimized adsorption conditions of pH=4 and adsorption time t=10 min,2.45 g methyl blue could be adsorbed using 1 g ZIF derived carbon@Cu/Ni NWs.And the adsorption efficiency of the ZIF derived carbon@Cu/Ni NWs can maintain 75%after recycling 5 times.