Article Dans Une Revue Spectrochimica Acta Part B: Atomic Spectroscopy Année : 2025

Online elemental characterization of collimated nanoaerosols by Laser-Induced Breakdown Spectroscopy of isolated particles

Résumé

We present a new setup for the online elemental characterization of nanoaerosols during their gas-phase synthesis using Laser-Induced Breakdown Spectroscopy (LIBS). This system involves the interaction of a kHz rate pulsed laser with a collimated jet of particles under vacuum conditions (10 -2 mbar), improving the LIBS detection capabilities. The low-pressure interaction reduces spectral line broadening, enhancing spectral resolution and eliminating background continuum from the laser-gas interaction. A sampling stage has also been incorporated into the design, enabling the continuous analysis of nanoaerosols during their high-throughput synthesis. This feature enhances the instrument's versatility and opens new possibilities for studying nanoparticle formation and properties in situ and in real-time.The proof of concept was produced by an experiment of online elemental analysis of Li2TiO3 nanoparticles during their synthesis by laser pyrolysis. The monitoring of the LIBS emission signal of the particles in real time was demonstrated by measuring the signals from the three elements together with data conditional analysis to extract the events information. Moreover, the specific detection of Li signals was achieved in a singlenanoparticle detection mode, enabling to reach an absolute detection limit of 150 ag. The collimation step of particles in a jet, combined with a high repetition rate laser, opens the way to speciated monitoring of low-density aerosols in the sub-micrometer range.
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hal-04919031 , version 1 (29-01-2025)

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Cesar Alvarez-Llamas, Nathalie Herlin-Boime, Jean-Baptiste Sirven, Olivier Sublemontier. Online elemental characterization of collimated nanoaerosols by Laser-Induced Breakdown Spectroscopy of isolated particles. Spectrochimica Acta Part B: Atomic Spectroscopy, 2025, 225, pp.107122. ⟨10.1016/j.sab.2025.107122⟩. ⟨hal-04919031⟩
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