Laser Wavelength Effect on Size and Morphology of Silicon Nanoparticles Prepared by Laser Ablation in Liquid

Abstract

The effect of laser wavelength on size and morphology of silicon nanoparticles are studied. To prepare nanoparticles, laser ablation in liquid technique is employed. Absorption spectra demonstrate that with laser wavelength of 532 nm, solution with higher concentration can be prepared in comparison with one obtained from laser wavelength of 1064 nm. Transmission electron microscope (TEM) images reveal nanoparticles with spherical shape from samples produced by both laser wavelengths. However, smaller particles size are obtained from sample prepared by laser wavelength of 532 nm. Raman spectra and photoluminescence (PL) spectra further support the existence of smaller crystal size in this sample.