RT Journal Article
T1 Ultrafast Laser Excitation Improves LIBS Performance for the Analysis of Optically Trapped Single Nanoparticles Owing to Characteristic Interaction Mechanisms
A1 Burgos-Palop, Clara
A1 Purohit, Pablo
A1 Fortes-Román, Francisco Javier
A1 Laserna-Vázquez, José Javier
K1 Química atmosférica
K1 Nanopartículas - Análisis
K1 Química analítica
AB Owing to the exceedingly small mass involved, complete elemental characterization of single nanoparticles demands a highly precise control of signal background and noise sources. LIBS has demonstrated remarkable merits for this task, providing a unique tool for the multielemental analysis of particles on the attogram–picogram mass scale. Despite this outstanding sensitivity, the air plasma acting as a heat source for particle dissociation and excitation is a meddling agent, often limiting the acquisition of an accurate sample signature. Although thermal effects associated with ultrashort laser pulses are known to be reduced when compared to the widely used nanosecond pulse duration regime, attempts to improve nanoinspection performance using ultrafast excitation have remained largely unexplored. Herein, picosecond laser pulses are used as a plasma excitation source for the elemental characterization of single nanoparticles isolated within optical traps in air at atmospheric pressure. Results for picosecond excitation of copper particles lead to a mass detection limit of 27 attogram, equivalent to single particles 18 nm in diameter. Temporally and wavelength-resolved plasma imaging reveals unique traits in the mechanism of atomic excitation in the picosecond regime, leading to a deeper understanding of the interactions occurring in single nanoparticle spectroscopy.
PB ACS
YR 2023
FD 2023-09-20
LK https://hdl.handle.net/10630/27800
UL https://hdl.handle.net/10630/27800
LA eng
NO Ultrafast Laser Excitation Improves LIBS Performance for the Analysis of Optically Trapped Single Nanoparticles Owing to Characteristic Interaction Mechanisms     Clara Burgos-Palop, Pablo Purohit, Francisco J. Fortes, and Javier Laserna     Analytical Chemistry 2023 95 (39), 14541-14550     DOI: 10.1021/acs.analchem.3c01376
NO Funding for open access charge: Universidad de Málaga / CBUAThis research was funded by the Spanish Ministerio de Economía y Competitividad under Projects CTQ2017-82137P and CTQ2014-56058P. C.B.-P. is grateful to the program “Ayudas de iniciación a la Investigación para estudiantes de Grado y Máster” from the University of Malaga’s ”I Plan Propio de Investigación, Transferencia y Divulgación”. P.P. is grateful to the European Union’s NextGeneration EU plan and the Spanish Ministerio de Universidades for his Margarita Salas fellowship under the program “Ayudas para la recualificación del Sistema Universitario español”.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 4 mar 2026