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Related Experiment Videos

Requirements for laser-induced desorption/ionization on submicrometer structures.

Shoji Okuno1, Ryuichi Arakawa, Kazumasa Okamoto

  • 1Wada Project Laboratory, Japan Science and Technology Agency, Innovation Plaza Osaka, 3-1-10 Technostage, Izumi, Osaka, Japan.

Analytical Chemistry
|August 16, 2005
PubMed
Summary

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Submicrometer structures enhance laser desorption/ionization for organic compounds. Surface modifications like roughness, grooves, and noble metal coatings (Au/Pt) improve ionization efficiency and signal intensity, enabling matrix-free analysis.

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Laser desorption/ionization (LDI) is a crucial technique for analyzing organic compounds.
  • Optimizing LDI performance often requires matrix application, which can complicate analysis.
  • Investigating matrix-free LDI on structured surfaces is essential for simplified and efficient analysis.

Purpose of the Study:

  • To explore the impact of submicrometer structures on matrix-free laser desorption/ionization.
  • To evaluate the influence of surface roughness, morphology, and coatings on ionization efficiency.
  • To determine optimal structural parameters for enhanced LDI performance.

Main Methods:

  • Investigated laser-induced desorption/ionization on various submicrometer structures (scratched surfaces, lithographically fabricated grooves, porous materials).

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  • Utilized a 337-nm nitrogen laser for ionization of synthetic polymers, reserpine, angiotensin, and insulin.
  • Examined the effect of surface roughness, groove orientation, and noble metal (Au/Pt) coatings on ionization efficiency.

    • Main Results:

    • Reduced laser fluences were required for ionization on scratched surfaces compared to untreated ones.
    • Lithographically fabricated submicrometer grooves enhanced ionization, with optimal performance related to laser and groove alignment.
    • Submicrometer porous structures coated with Au or Pt yielded intense molecular ion signals and prolonged activity, even in ambient air.

    Conclusions:

    • Submicrometer structures are key for effective direct laser desorption/ionization on rough surfaces.
    • Noble metal coatings on porous submicrometer structures significantly enhance ionization and stability.
    • Matrix-free LDI is feasible and efficient on appropriately designed submicrometer structures, irrespective of the base material.