Characteristics of γ-Al2O3 nanoparticles generated by continuous-wave laser ablation in liquid
Source abstract
Abstract
Laser ablation in liquid is one of the most widely investigated methods for generating various nanoparticles (NPs) that are difficult to produce using other means. In this paper, we report the generation of Al-oxide NPs by continuous-wave (CW) fibre laser ablation of corundum (α-Al 2O3) target submerged in deionised water. The effects of CW fibre laser power and radiation time have been investigated. Characterisation of the NPs generated, in terms of size, size distribution, shape, chemical composition, and phase structure, was carried out by means of high-resolution transmission electron microscopy (HR-TEM), high angle annular dark field (HAADF) in scanning-transmission (STEM) mode, energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The results show that the average size of Al-oxide NPs, in the range of 17 to 29 nm, increased with increasing the laser power and laser exposure time, and the NPs are dominated by stoichiometric γ-Al2O3 with a minor phase of α-Al 2O3. The mechanism involved in the CWLAL is also discussed. © 2010 Springer-Verlag.
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Research context
OpenAlex topics: Laser-Ablation Synthesis of Nanoparticles · Nonlinear Optical Materials Studies · Laser-induced spectroscopy and plasma
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