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Time-resolved spectroscopic studies and spectral imaging analysis of plasmas induced by laser in air containing nanoparticles

Abstract : Today, nanotechnology is a growing field of research and nanoparticlebased material production is expected to soar in years to come. Though research is still currently under way to secure nanoparticle production processes, the risk of accidental release is not to be neglected. Consequently, there is an urgent need for the manufacturers to have at their command a tool enabling leak detection in-situ and in real time so as to protect workers from potential exposure. In this context, the LIBS technique was evaluated as a potential candidate for workplace surveillance in industries producing nanoparticle-based materials. This work was focused on the comprehension of the mechanisms taking place during laser / plasma / particle interaction in order to further achieve LIBS measurements with optimum efficiency. Though the present study was devoted to nanoparticle analysis, particle size was extended up to 1 m to facilitate the comprehension of the mechanisms involved when vaporizing particles within a laser-induced plasma. Polydisperse and monodisperse flows of sodium and metallic particles with sizes ranging from 40 nm up to 1 m produced by two different particle generators were introduced in a cell dedicated to LIBS analysis. To begin with, time-resolved spectral imagery was employed to visualize the spatialtemporal evolution of the vaporized matter within the expanding plasma plume induced in air containing particles and flowing through the cell. Then, time-resolved emission spectroscopy measurements were carried out for LIBS purposes. The influence on the LIBS measurements of parameters such as chemical nature of particles, their concentration, laser wavelength, laser energy, kind of background gas have been investigated. The results obtained combining spectral imagery and emission spectroscopy fuel the debate on the mechanisms involved during particle vaporization within the laser induced plasma and highlight the importance of studying the analytical signal temporal evolution when analyzing particles using LIBS.
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https://hal-ineris.archives-ouvertes.fr/ineris-00970385
Contributor : Gestionnaire Civs <>
Submitted on : Wednesday, April 2, 2014 - 3:47:06 PM
Last modification on : Friday, October 4, 2019 - 1:23:15 AM

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  • HAL Id : ineris-00970385, version 1
  • INERIS : EN-2008-202

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Tanguy Amodeo, Christophe Dutouquet, Olivier Le Bihan, Emeric Frejafon, Michel Attoui. Time-resolved spectroscopic studies and spectral imaging analysis of plasmas induced by laser in air containing nanoparticles. 5. International Conference on Laser-Induced Breakdown Spectroscopy (LIBS 2008), Sep 2008, Adlershof, Germany. ⟨ineris-00970385⟩

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