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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI spectrometry is widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.
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Related Experiment Video

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Metal micro/nanostructure enhanced laser-induced breakdown spectroscopy.

Qiuyun Wang1, Yitong Liu1, Luyun Jiang2

  • 1Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, China.

Analytica Chimica Acta
|January 19, 2023
PubMed
Summary

Femtosecond laser ablation created micro/nanostructures on copper, significantly enhancing laser-induced breakdown spectroscopy (LIBS) sensitivity for trace metals in water. This method offers a more sensitive approach for detecting elements like lead and chromium.

Keywords:
Electron densityLaser-induced breakdown spectroscopyLimit of detectionMicro/nanostructurePb and CrPlasma temperatureSpectral enhancement

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Laser Physics

Background:

  • Laser-induced breakdown spectroscopy (LIBS) is a powerful analytical technique.
  • Surface micro/nanostructures can influence plasma properties and spectral intensities.
  • Improving the sensitivity of LIBS for trace element detection remains a key challenge.

Purpose of the Study:

  • To investigate the effect of femtosecond laser-induced micro/nanostructures on copper surfaces.
  • To evaluate the impact of these structures on nanosecond LIBS performance.
  • To assess the enhanced LIBS method for trace metal detection in aqueous solutions.

Main Methods:

  • A femtosecond laser was used to ablate a copper (Cu) sample, creating a micro/nanostructural surface layer.
  • Nanosecond laser-induced breakdown spectroscopy (LIBS) was employed to analyze the Cu plasma and trace elements in water.
  • Spectral intensities, plasma temperature, and electron density were measured and calculated.

Main Results:

  • The micro/nanostructural layer significantly enhanced Cu plasma spectral intensity by 82.5 times at 13.3 mJ laser energy.
  • Micro/nanostructures led to increased Cu plasma temperature and electron density.
  • Detection limits for Pb and Cr in water were significantly improved to 1.85 ng/mL and 0.51 ng/mL, respectively, at low laser energy.

Conclusions:

  • Femtosecond laser-induced surface micro/nanostructures effectively enhance LIBS performance.
  • The enhanced LIBS method demonstrates superior sensitivity for detecting trace metal elements in water.
  • This technique holds promise for sensitive environmental and industrial monitoring applications.