Preparation and Characterization of Silicon Nanoparticles by Laser Ablation in Ethanol

Synthesis of silicon nanoparticles (NPs) via laser ablation of silicon wafer immersed in ethanol studied based on optical measurements of Si colloidal solution. The experimental results are conducted using 20 ns pulsed laser irradiation at wavelength 1064 nm. The resulting nanoparticles are characterized by UV-Visible absorption spectrometry transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectra.The particle size dependence on the laser fluence is studied. UV-Visible spectrum shows characteristic shifts corresponding to size, consistent with quantum confinement. The small sized nanoparticles show the largest quantum yield consistent with indirect band gap nanoparticles.

کلیدواژه ها:

Nanoparicles ، Laser ablation ، UV-Visible ، Si