Abstract
This work was devoted for production of alumina (Al 2 O 3 ) nanoparticles via PLAL technique from a solid alumina target immersed in different solutions Distilled Water (D.W) as well as in ethanol in order to study the effect of these different solutions on the optical properties and structure of Al 2 O 3 nanoparticles. The controllability of particle size and size distribution is shown in this paper to be dependent upon the type of media and it proved that the peak absorption spectrum of samples produced in ethanol is lower than that produced in water. Thus it implies that the ablation efficiency in ethanol is lower, but in the same time it ensures that its oxides are not formed in ethanol due to prohibition of ethanol surrounding media form oxidation. The produced NPs were characterized via many tests such as UV-visible (UV-Vis.) and Atomic Force Microscope (AFM).
Highlights
The properties and behavior of materials at nano levels have special properties, these nanoparticles show great differences of their outstanding properties such as physical, chemical, optical and electronic properties from the bulk material of which they are made [1].Pulsed Laser Ablation in Liquid (PLAL) has become an increasingly important technique for production metals and metal oxides nanoparticles (NPs) and others
D.W and ethanol were used as ablation environment to capture and store the synthesized NPs. both ethanol and D.W media play a crucial role in the nature of produced Al2O3 NPs, ethanol is proposed to be an optimal substitute of D.W. for fabricating pure materials colloid because of the ethanol prohibition to form oxidation
While that the ablation efficiency in ethanol is lower than D.W because of lower absorption spectra of ethanol indicates lower abundance of NPs in solution
Summary
Pulsed Laser Ablation in Liquid (PLAL) has become an increasingly important technique for production metals and metal oxides nanoparticles (NPs) and others This technique has its many advantages compared with other conventional techniques (physical and chemical) such as purity, stability of the fabricated nanoparticle colloids, and do not require a vacuum chamber. It is the most flexible and promising technique because of its ability to control NPs size by optimizing the laser parameters, this technique provides the possibility of generating a large variety of NPs those are free of both surface-active substances and counter ions[2,3,4,5]. After plasma extinguishing the formed nanoparticles clusters encounter and interact with the solvent and surfactant molecules in the surrounding solution, typically all these steps take place and nanoparticles are synthesized about a few microseconds [6,7]
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