Synthesis of 200-nm pentacle Au–Cu alloy nanocrystals. In a standard
synthesis of pentacle Au–Cu alloy nanocrystals, 0.3 ml of aqueous CuCl2  2H2O
(100 mM), 0.3 ml of aqueous HAuCl4  3H2O (100 mM), 45mg of HDA, 0.28 ml of
aqueous glucose (1 M) and 4ml of water were added in a 20-ml vial at room
temperature. After the vial had been capped, the solution was magnetically stirred
at room temperature overnight. The capped vial was then transferred into an oil
bath and heated at 100 C for 30 min under magnetic stirring，

还有一种方法是制备油相的，用油胺为配体制备。。。120℃就可以