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Laser-induced breakdown spectroscopy signal enhancement effect for argon caused by the presence of gold nanoparticles

Palásti, Dávid J. and Villy, Lajos P. and Kohut, Attila and Ajtai, Tibor and Geretovszky, Zsolt and Galbács, Gábor (2022) Laser-induced breakdown spectroscopy signal enhancement effect for argon caused by the presence of gold nanoparticles. SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 193. p. 106435. ISSN 0584-8547

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Abstract

The effect of the presence of nanoparticles (NPs) on the laser induced breakdown spectroscopy (LIBS) signal of argon gas was studied experimentally. 10–20 nm diameter gold NPs, produced by a spark discharge nanoparticle generator, were suspended in argon gas. The effect of particle size, number concentration and mass concen- tration, as well as laser pulse energy on the LIBS argon signal was systematically investigated. It was found that the breakdown threshold of the gas decreases considerably, facilitating the detection of Ar emission at such laser fluences, which do not allow plasma formation without the presence of the NPs. Our observations persist even at aerosol mass concentrations that are too low to allow the direct detection of nanoparticles. The effect, which is attributed to electron thermo- and field emission induced by the high intensity laser pulse, shows an asymp- totically increasing magnitude with the aerosol mass concentration. The signal enhancement was found to be 102–104 and the effect is suggested to be useful in trace gas analysis or for the indirect detection of NPs. The achievable indirect aerosol mass concentration detection limit was estimated to be in the parts per trillion regime (as low as 50 ng⋅m 3) which is comparable to the best literature values reported for direct analysis.

Item Type: Article
Uncontrolled Keywords: Nanoparticle-enhanced LIBS (NELIBS), Electrical discharge nanoparticle generator, Signal enhancement, Indirect nanoparticle detection Trace gas analysis
Subjects: Q Science / természettudomány > QD Chemistry / kémia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 05 May 2022 11:56
Last Modified: 05 May 2022 11:56
URI: http://real.mtak.hu/id/eprint/142221

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