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采用MEVVA源 (metalvaporvacuumarcionsource)引出的强束流脉冲Ag,Cu离子先后注入到SiO2 玻璃 ,x射线光电子能谱仪 (XPS)分析显示Ag ,Cu大多仍为金属态 ,有部分氧化态Cu存在 .透射电镜观察分析和光学吸收谱都表明在衬底中形成了纳米合金颗粒 .结合有效媒质理论 ,得到模拟的光学吸收谱 ,与实验结果基本符合 ,较好地验证了以上结论 .样品退火后颗粒发生分解 ,分解的颗粒在氧化气氛下被氧化 ,且有部分向样品表面蒸发 ;在还原气氛下氧化态元素被还原并成核生长 .故可通过改变退火条件对纳米颗粒的成核生长进行调制
The Cu (superscript 2 +) ions were implanted into SiO2 glass by means of the strong beam pulse derived from MEVVA source (metalvaporvacuumarcionsource). XPS analysis showed that most of Ag and Cu are still in metallic state and some of Cu exists. Electron microscopy and optical absorption spectra show that the nano-alloy particles are formed in the substrate.According to the theory of effective medium, the simulated optical absorption spectra are obtained, and the results are in good agreement with the experimental results, which verify the above conclusion. The decomposed and decomposed particles are oxidized in the oxidizing atmosphere and some of them are evaporated to the surface of the sample. The oxidized state elements are reduced and nucleated and grown under the reducing atmosphere, so the nucleation and growth of the nanoparticles can be modulated by changing the annealing conditions