利用二步液相还原法制备了Au/Ag芯-壳复合结构的纳米颗粒.用TEM对反应液中金离子和银离子的摩尔比分别为1:2和1:1时所制备的Au/Ag芯-壳复合结构的纳米颗粒的尺寸和形貌进行了表征.其紫外-可见吸收光谱具有2个可区分的吸收带,与纯金和纯银纳米颗粒的光学吸收特性对比后认为:随着反应液中银离子摩尔份数的增加,等离子体共振吸收峰始终位于410nm附近的吸收带为银纳米颗粒的等离子体吸收带;另一个将随之产生蓝移的吸收带为Au/Ag芯-壳复合结构纳米颗粒的等离子体吸收带,蓝移是由于银壳厚度的增加而引起的.
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