Preparation Of Polyaniline Coated Graphene Nano-silver-nickel Alloy

Silver-nickel nanoalloy material has been aroused extensive concern for its great values in the field of electrical contacts,magnetic storage,and catalysts in recent years.Graphene are considered as an ideal composite carrier with its unique structure and excellent properties compared with other carbon materials.The synthesis of graphene and metal composites are now being one of the hotspots in novel functional applications materials.Polyaniline also attracted huge attention for its excellent performance in electrochemistry.In this research,silver-nickel nanoalloy was prepared by liquid-phase reduction method.Graphene oxide?GO?was prepared by using modified Hummers method.Graphene/silver-nickel alloy composites were prepared with liquid-phase reduction method.The technology and catalytic properties were studied in this work.Based on this composite,Polyaniline-coated graphene silver-nickel nanoalloy composite is prepared and its structure is characterized.The first,silver-nickel nanoalloy has been synthesized with hydrazine hydrate as reducer and OP-10 as surfactant.The performances of silver-nickel nanoalloy were characterized by FT-IR,XRD,SEM and other means.The detailed analysis of the synthesis conditions show that the reduction takes place in alkaline environment and low-temperature is propitious to generate alloy solid-solution grain.Meanwhile,it is conducive to inhibit the growth of grain and is helpful to prevent the reunification of dispersing particles by using a small amount of OP-10 as a modifier.The second,graphene oxide was prepared by modified Hummers method.Different mass ratio of nickel-silver salt and GO were used as raw materials and diluted hydrazine hydrate was used as reducing agent to synthesis graphene/silver-nickel alloy composites.Study shows that the composites would have the optimum particle size when the nickel salt and GO have the mass ratio of 1:7,the particle size of silver-nickel nanoalloy is about 50nm.The carbon electrode which modified by graphene/silver-nickel alloy composites was used as the working electrode to explore its electrochemical activity in p-nitrophenol solution and glucose solution by cyclic voltammetric analysis.Studies have shown that compared with the unmodified electrode,the modified carbon electrode exhibits a higher electrochemical activity,and it provides a new method for detecting the p-nitrophenol and glucose in water.The last,Polyaniline-coated graphene silver-nickel nanoalloy is synthetized using in-situ polymerization method with ammonium persulfate being oxidant.The technology and catalytic properties were studied in this work.The results of cyclic voltammetric analysis indicate that the conductivity of nanocomposites is enhanced by doping with graphene/silver-nickel alloy composites and the specific capacitance reaches maximum of 785.26F·g^-1 with 40wt%graphene/silver-nickel alloy composites loading.