Light Emission from Nanometer-Sized Silicon Particles Fabricated by the Laser Ablation Method

Abstract

Luminescent nanometer-sized silicon particles are fabricated by laser ablation of a silicon target in helium gas. The formation of products is found to be governed by the dynamics of the laser-ablated silicon particles in the gas. The products deposited on silicon substrates exhibit light emission with a peak at 1.6 eV in the air, while 2.1 eV after annealing for 20 min at 800°C in oxygen gas. Applying the laser ablation technique, we demonstrate a novel technique for fabricating silicon particles embedded in a silicon dioxide film. The particles also exhibit visible light emission.

Formation of nanoparticles by short and ultra-short laser pulses

“…The parameters of intermolecular potential (Morse potential) are chosen to represent the van der Waals interaction in a molecular solid with the cohesive energy of 0.6 eV, elastic bulk modulus of ~5 GPa, and density of 1.2 g/cm 3 . A mass of 100 Dalton is attributed to each molecule [19], [20].…”

“…The volume of the computational cell and the gas density determine the number of gas particle in our simulation. The volume of the cell is constant and equal to 100×100×100 nm 3 . Then, for the gas with the number density of 2.0 10 19 part/cm 3 , we use 20 000 particles of gas.…”

A Hybrid Laser/Aerosol Method for the Synthesis of Porous Nanostructured Calcium Phosphate Materials for Bone Tissue Engineering Applications

“…8 12 120 resulting from Browning motion. This suggests that a 2.8 41 220 redesign of our ablation chamber may be necessary to better control this nanoparticle population and enable its more controllable use as the source of nanophase medium for potential biological stimulation in our coatings.…”

“…Illustration of how a and coagulation growth [8], hydrodynamic sputtering [9], calcium phosphate aerosol may be and subsurface boiling [10] have been found to play generated by laser ablation of a important roles depending on target material and hydroxyapatite ceramic target. .…”

Mechanisms of Nanoparticle Formation by Laser Ablation

“…This technique, known as pulsed laser ablation (PLA), has become a promising method of the synthesis of nanoclusters for photonics, electronics and medicine (Movtchan et al, 1995;Yamada et al, 1996;Makimura et al, 1996;Geohegan et al, 1998;Albert et al, 2003). The PLA method has several advantages compared to more traditional techniques.…”