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对用蒸发技术制备的Cu -MgF2 纳米金属陶瓷薄膜微结构及吸收光谱特性进行了研究。微结构分析表明薄膜由fcc -Cu纳米晶粒镶嵌于主要呈非晶态的MgF2 基体中所组成 ,晶粒的平均粒度约为 1 4～ 1 6nm。Cu -MgF2 纳米金属陶瓷薄膜在 2 0 0～ 80 0nm波段内的吸收光谱表明 :随着波长增加 ,吸收减小 ;Cu纳米晶粒的表面等离子共振吸收峰出现于 560nm处 ;短波长区呈现较强的Cu的带间跃迁吸收。用三维弥散系统的Maxwell-Garnett理论对Cu -MgF2 复合体系的实验吸收光谱特性作出了解释。
The microstructure and absorption spectra of Cu-MgF2 nanocrystalline cermets prepared by evaporation technique were studied. Microstructure analysis showed that the film was composed of fcc-Cu nanocrystals embedded in a mainly amorphous MgF2 matrix with an average grain size of about 14 to 16 nm. The absorption spectra of Cu-MgF2 nanocrystalline cermets show that the absorption decreases with increasing wavelength, the surface plasmon resonance absorption peak of Cu nanocrystals appears at 560 nm, Strong Cu band-to-band transition absorption. The Maxwell-Garnett theory of three-dimensional dispersion system is used to explain the experimental absorption spectra of Cu-MgF2 composite system.