通过液相还原法制备出金-银复合纳米颗粒.透射电镜图像显示所制备金-银复合纳米颗粒呈球状的芯-壳结构.光学吸收谱的实验表明:金芯-银壳复合结构纳米微粒具有双峰的等离子体吸收带.一个峰值的波长位于纯银纳米颗粒的等离子体吸收带附近;另一个介于纯银和纯金纳米颗粒的等离子体吸收峰之间,且随着反应试样中银的摩尔分数的增加发生蓝移,基于实验分析和Mie散射理论的定量计算.结果认为:该吸收峰的蓝移可归因于银壳层厚度的增加.
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