金属微粒-介质复合薄膜(Au-BaO,Cu-BaO)的光吸收

PHOTOABSORPTION OF COMPLEX THIN FILMS OF NOBLE METAL PARTICLES EMBEDDED IN MATRIX (Au BaO,Cu BaO)

对真空沉积方法制备的贵金属微粒（Ａｕ，Ｃｕ）与介质（ＢａＯ）构成的复合薄膜做了近紫外—可见光吸收光谱分析．两种薄膜的吸收谱有明显不同，ＡｕＢａＯ薄膜的吸收谱图可观察到等离激元共振吸收和带间跃迁吸收，而ＣｕＢａＯ薄膜在可见光波段有几个吸收峰，这是因为Ｃｕ微粒在薄膜生长中形成了非常小的颗粒．当贵金属含量不同时。

Abstract In this paper the ultraviolet—visible photoabsorption spectrum of the complex thin films of noble metal (Au,Cu) particles embedded in BaO matrix is measured.The absorption spectra of the two kinds of films are quite different.There are surface plasmon mode and band transition absorption in the spectrum of the Au BaO thin film.However,several peaks appear in the spectrum of the Cu BaO thin film,because Cu exists as very small particles in the matrix.The absorption spectrum is dependent on the metal content.