Structural Analysis of Nanoparticles Formed via Laser Ablation of Porous Silicon and Silicon Microparticles in Water

摘要

Silicon nanoparticles with sizes of 50-300 nm have been formed via picosecond laser ablation of porous silicon and silicon microparticles in water using various targets. Raman spectroscopy has revealed the presence of a low amount of the amorphous phase in the obtained particles (10-12%) prepared from micro- and mesoporous silicon layers and almost a zero degree of crystallinity in the case of laser fragmentation of silicon micropowders in water. The results are promising for further application of the nanoparticles in photonics and biomedicine.