Jump to main content
Jump to site search

Issue 17, 2015
Previous Article Next Article

A spectral sieve-based strategy for sensing inorganic and organic traces on solid surfaces using laser-induced breakdown spectroscopy

Author affiliations

Abstract

Laser-induced breakdown spectroscopy (LIBS) has been used in recent years as a powerful tool for diagnosing dangerous residues on a variety of surfaces. While not itself straightforward, the task becomes much simpler when scenarios are custom designed. A more difficult question then arises when the scenario is unknown. The inherent ambiguity within the spectral resources gathered from this type of scenario presents a challenge to the analytical power of LIBS. Since no tools are available for confident identification of the optical emissions of the surface, the residue, or both, a novel method is now proposed based on sieving the spectral data. The strategy is based on threshold splitting of the spectral responses in the dataset using linear correlation measurements. The output of such splitting allows the emission spectrum of the surface to be predicted, thereby identifying uncorrelated emission signals with the potential residue. The strengths and weaknesses of the methodology are critically discussed. The suggested method allows accurate identification of the emission spectrum of the surface in scenarios for which 60% of the spectral resources correspond exclusively to a ‘clean’ surface. In the case of scenarios that are complex, in that the chemical composition of the surface and the residue are similar, the use of emission intensity ratios instead of considering the entire spectrum improves the methodology. The results presented suggest that this approach gives greater selectivity to the LIBS technique in the assessment of unknown targets in the recognition of explosives.

Graphical abstract: A spectral sieve-based strategy for sensing inorganic and organic traces on solid surfaces using laser-induced breakdown spectroscopy

Back to tab navigation

Article information


Submitted
19 Feb 2015
Accepted
27 Apr 2015
First published
29 Apr 2015

Anal. Methods, 2015,7, 7280-7289
Article type
Paper

A spectral sieve-based strategy for sensing inorganic and organic traces on solid surfaces using laser-induced breakdown spectroscopy

J. Moros and J. J. Laserna, Anal. Methods, 2015, 7, 7280
DOI: 10.1039/C5AY00461F

Social activity

Search articles by author

Spotlight

Advertisements