Abstract Silver nanoparticles have been grown onto crystalline silicon substrates. Three soft-solution one-step processing techniques have been assayed: electroless metal deposition (EMD), electrodeposition (ED) and spray pyrolysis (SP). The shapes exhibited by the silver nanoparticles prepared by EMD and ED are hemispherical, while the shapes of those prepared by SP (for long processing times) are similar to disks of aspect ratio 0.5 approximately. Integrated total reflectance spectra and integrated diffuse reflectance spectra shows distinctive features due to the electronic structure of silicon. Specular reflectance spectra of samples (except those grown by SP with long processing times) show a dip, corresponding to a surface plasmon resonance. Simulations, considering granular composite media were made. The simulated spectra confirm the presence of the spectral dip. Surface plasmon resonance show shifts with the angle of incidence. For samples prepared by ED, the tendency is the same as the one of the model, indicating that there is not much coupling between nanoparticles.

中文翻译：

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通过不同的软溶液处理技术沉积在硅衬底上的银纳米粒子的光学特性

摘要 银纳米粒子已经生长在晶体硅衬底上。已经测定了三种软溶液一步处理技术：化学镀金属沉积 (EMD)、电沉积 (ED) 和喷雾热解 (SP)。EMD和ED制备的银纳米粒子呈现出的形状为半球形，而SP制备的银纳米粒子的形状（长处理时间）类似于纵横比约0.5的圆盘。由于硅的电子结构，积分全反射光谱和积分漫反射光谱显示出独特的特征。样品的镜面反射光谱（除了那些由 SP 长处理时间生长的样品）显示下降，对应于表面等离子体共振。进行了考虑粒状复合介质的模拟。模拟光谱证实了光谱倾角的存在。表面等离子体共振显示随着入射角的变化。对于 ED 制备的样品，趋势与模型之一相同，表明纳米颗粒之间没有太多耦合。