The double potential step technique was applied to the second electrolysis for the growth of AuNP seeds.The results revealed that the size of the AuNP was dependent on the electrolysis coulomb.

• 接着采用电位双阶跃方法，使金纳米粒子在原来基础上继续生长，控制电解电量可获得不同大小的金纳米粒子。