Metal micro/nanostructure enhanced laser-induced breakdown spectroscopy

Qiuyun Wang; Yitong Liu; Luyun Jiang; Anmin Chen; Jianhui Han; Mingxing Jin

doi:10.1016/j.aca.2023.340802

Metal micro/nanostructure enhanced laser-induced breakdown spectroscopy

Anal Chim Acta. 2023 Feb 8:1241:340802. doi: 10.1016/j.aca.2023.340802. Epub 2023 Jan 4.

Authors

Qiuyun Wang¹, Yitong Liu¹, Luyun Jiang², Anmin Chen³, Jianhui Han⁴, Mingxing Jin¹

Affiliations

¹ Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, China.
² State Key Laboratory of Laser Propulsion & Application, Department of Aerospace Science and Technology, Space Engineering University, Beijing, 101416, China.
³ Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, China. Electronic address: amchen@jlu.edu.cn.
⁴ State Key Laboratory of Laser Propulsion & Application, Department of Aerospace Science and Technology, Space Engineering University, Beijing, 101416, China. Electronic address: hanjh17@mails.jlu.edu.cn.

PMID: 36657874
DOI: 10.1016/j.aca.2023.340802

Abstract

This study used a femtosecond laser to ablate a Cu sample, forming a micro/nanostructural layer on the surface. And the effect of this structural layer on nanosecond laser-induced breakdown spectroscopy (LIBS) was discussed. Firstly, the effect of the micro/nanostructural layer on the intensity of laser-induced Cu plasma spectra was investigated. The micro/nanostructure could significantly enhance the spectral intensity of the Cu plasma by 82.5 times at 13.3 mJ laser energy. Secondly, the Cu plasma temperature and electron density were calculated. The micro/nanostructures could significantly increase Cu plasma temperature and electron density. Finally, the effect of micro/nanostructure surface on the spectral intensities of Pb and Cr elements in water was investigated for LIBS analysis. It was found that the detection limit of Pb and Cr trace metal elements in water was 1.85 ng/mL and 0.51 ng/mL at a lower laser energy (13.3 mJ), which was significantly better than other LIBS methods reported so far. The results show that the micro/nanostructure enhanced LIBS is a more sensitive method for detecting trace metal elements in the water.

Keywords: Electron density; Laser-induced breakdown spectroscopy; Limit of detection; Micro/nanostructure; Pb and Cr; Plasma temperature; Spectral enhancement.