a study on the morphology of the silver nanoparticles deposited on the n-type porous silicon prepared under different illumination types

In this study, the influence of n-type porous si (n-ps) morphology properties and the performance of ag nanoparticles (agnps)/n-ps raman substrate were investigated. two kinds of n-ps morphology (macro n-ps and mud n-ps) structures were fabricated by laser-assisted etching (lae) process and ordinary light-assisted etching (olae) process, respectively. a simple and cost-effective immersion plating process of n-ps in 0.01 m concentration of agno3 for 16-min immersion time was used to synthesize agnps. the morphological properties of the deposited agnps on the macro n-ps layer showed that the deposition process is concentrated on the pore wall with a little density, while for mud n-ps, the agnp layer is mainly composed of high-density uniformly distributed spherical particles located over the mud surface. surface-enhanced raman scattering (sers) process of agnps/n-ps revealed strong dependence on the morphology and the density of agnps. enhancement factor (ef) of raman signal of agnps/mud n-ps substrate is three orders of magnitude higher than that of agnps/macro n-ps substrate of about 1.6 × 1011 and 8.2 × 108, respectively.