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Discrimination of composite graphite samples using remote filament-induced breakdown spectroscopy.

Elizabeth J Judge1, George Heck, Elizabeth B Cerkez

  • 1Temple University Department of Chemistry, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, USA.

Analytical Chemistry
|March 5, 2009
PubMed
Summary

Remote filament-induced breakdown spectroscopy (R-FIBS) offers accurate, remote analysis of graphite composites. This technique surpasses femtosecond laser-induced breakdown spectroscopy (fs-LIBS) in precision for material characterization at a distance.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Laser-induced breakdown spectroscopy (LIBS) enables remote elemental analysis.
  • Ultrashort laser pulses offer unique material interaction properties for LIBS.
  • Characterizing composite materials requires precise, non-contact analytical methods.

Purpose of the Study:

  • To evaluate remote filament-induced breakdown spectroscopy (R-FIBS) for analyzing graphite composites.
  • To compare R-FIBS with femtosecond laser-induced breakdown spectroscopy (fs-LIBS) for remote material analysis.
  • To determine the carbon/clay ratios in graphite composites of varying hardness.

Main Methods:

  • Utilized ultrashort laser pulses for remote filament-induced breakdown spectroscopy (R-FIBS).

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  • Employed femtosecond laser-induced breakdown spectroscopy (fs-LIBS) for comparative analysis.
  • Validated results with optical microscopy and electron microprobe point detection.

    • Main Results:

    • R-FIBS and fs-LIBS demonstrated similar selectivity and emission excitation capabilities.
    • R-FIBS provided more accurate carbon/clay ratio measurements than fs-LIBS.
    • Plasma temperature measurements indicated non-equilibrium conditions between clay and graphite microdomains.

    Conclusions:

    • R-FIBS is a highly accurate remote probing technique for qualitative analysis of composite materials.
    • The intensity clamping of the filament ablation source contributes to R-FIBS's superior accuracy.
    • Further investigation into non-equilibrium plasma dynamics in composites is warranted.