Preparation and properties of silicon nanocrystals by femtosecond laser in solution doped with Boron

Colloidal silicon (Si) nanocrystals (NCs) were made via femtosecond laser ablation of silicon power in 1-octadecene mixed with boron oxide. It is reflected that nano-particles dispersed evenly in 1-octadecene without aggregation via High resolution transmission electron microscopy (HRTE). Phenomenon with a redshift and an asymmetrical widening of Raman peak is demonstrated by Raman analysis. Fourier transform infrared (FTIR) spectra directly show that oxide molecules and organic chains have terminated the surfaces of Si nanoparticles. According to Raman spectra and FTIR spectra, we can infer that boron atoms are incorporated into Si NCs or connected with Si NCs surfaces. In the light of room-temperature photoluminescence (PL) spectra, the PL peeks remain unchanged, moreover, PL intensity were found to reduce with increasing amount of boron oxide.