Subfemtogram Simultaneous Elemental Detection in Multicomponent Nanomatrices Using Laser-Induced Plasma Emission Spectroscopy within Atmospheric Pressure Optical Traps

Simultaneous detection of multiple constituents in the characterization of state-of-the-art nanomaterials is an elusive topic to a majority of the analytical techniques covering the field of nanotechnology. Optical catapulting (OC) and optical trapping (OT) have recently been combined with laser-ind...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2019-06, Vol.91 (11), p.7444-7449
Main Authors: Purohit, Pablo, Fortes, Francisco J, Laserna, J. Javier
Format: Article
Language:English
Subjects:
Chemistry
Cones
Emission spectroscopy
Iron constituents
Laser induced breakdown spectroscopy
Laser plasmas
Lasers
Nanomaterials
Nanoparticles
Nanotechnology
Optical trapping
Optical traps
Organic chemistry
Sampling
Spectroscopy
Spectrum analysis
Three dimensional printing
Trapping
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Summary:Simultaneous detection of multiple constituents in the characterization of state-of-the-art nanomaterials is an elusive topic to a majority of the analytical techniques covering the field of nanotechnology. Optical catapulting (OC) and optical trapping (OT) have recently been combined with laser-induced breakdown spectroscopy (LIBS) to provide single-nanoparticle resolution and attogram detection power. In the present work, the multielemental capabilities of this approach are demonstrated by subjecting two different types of nanometric ferrite particles to LIBS analysis. Up to three metallic elements in attogram quantities are consistently detected within single laser events. Individual excitation efficiency for each species is quantified from particle spectra showing an exponential correlation between photon production and the energy of the upper level of the monitored atomic line. Moreover, a new sampling strategy based in skimmer-like 3D printed cones that allows for thin dry nanoparticle aerosols to be formed via optical catapulting is introduced. Enhanced sampling resulted in an increase of the sampling throughput by facilitating stable atmospheric-pressure optical trapping of individual particles and spectroscopic chemical characterization within a short timeframe.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.9b01579