Synthesis of silicon nanoparticles by laser ablation at low fluences in water and ethanol

• Published in: Materials research express Vol. 7; no. 2; pp. 25008 - 25016
• Main Authors: Serrano-Ruz, J A, Quiñones-Galván, J G, Santos Cruz, J, de moure-Flores, F, Campos González, E, Chávez-Chávez, A, Gómez-Rosas, G
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.02.2020
• Subjects: Ablation; Colloids; Ethanol; Laser ablation; laser ablation in liquids; laser fragmentation; Lasers; Nanocrystals; Nanoparticles; Raman spectroscopy; Si nanoparticles; Silicon; Synthesis
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ab6e2f

Colloidal silicon nanoparticles (Si-nc) where synthesized by laser ablation of a solid Si target in water and ethanol. The target was immersed in a vessel containing the solvent and irradiated during 5 and 10 min at different fluences: 0.530, 0.608, 0.687 J cm−2. Ablation was carried out using a laser wavelength of 1064 nm. The obtained colloidal nanoparticles were irradiated after the synthesis to evaluate if laser fragmentation could be produced. In addition, a series of nanoparticles using ethanol as liquid medium was synthesized ablating with 532 nm. Colloidal nanoparticles were structurally characterized by Raman spectroscopy and Transmission Electron Microscopy. Size of the Si-nc were calculated by the theorical models: Bond Polarizability Model (BPM) and One-Phonon Confinement Model (PCM), where nanocrystals ranging from 2 to 11 nm were found.