A controlled synthesis of core-shell nanostructure of the gold-nickel systems prepared glycol

One of ethylene glycol controlled synthesis systems prepared a nickel gold core-shell nanostructures, there are eight steps: First, the polyvinylpyrrolidone is added to a solvent mixture of ethylene glycol was stirred until dissolved; Second, the aqueous sodium citrate solution was added to glycol solution from the previous step was stirred uniformly; three, purged with nitrogen, at a temperature of 185 deg.] C at a rate of 300ml h / chloroauric acid solution was added and the reaction 0.5H; Fourth, keeping the temperature constant, to 100ml / h of rate of addition of sodium hydroxide and a mixed solution of nickel nitrate and the reaction IH; five, to the reaction solution obtained in the previous stage centrifugal rotation for 3 ~ 10min ~ 15000rpm at 10000 rpm for cleaning; six, the reaction solution obtained in the above step 50 to ultrasonic cleaning in chloroform 100MHz using 5 ~ 10min; seven, the step of the reaction solution obtained using analytically pure alcohol in an ultrasonic cleaning 5 ~ 10min in 50 ~ 100MHz; eight, to the reaction solution obtained in the above step 50 ~ 100MHz ultrasonic analytically pure alcohol utilized in ultrasonic cleaning the gold-nickel core-shell nano structure obtained after 5 ~ 10min.