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Related Experiment Videos

Surface-plasmon-resonance-enhanced cavity ring-down detection.

Andrew C R Pipino1, John T Woodward, Curtis W Meuse

  • 1Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. andrew.pipino@nist.gov

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

Cavity ring-down spectroscopy measures the optical response of gold nanoparticles to adsorbed trichloroethylene (TCE) and perchloroethylene (PCE). This technique achieves high sensitivity for detecting these volatile organic compounds in gas phase.

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Area of Science:

  • Plasmonics
  • Spectroscopy
  • Nanomaterials

Background:

  • Localized surface plasmon resonance (SPR) is sensitive to the dielectric environment.
  • Gold nanoparticles exhibit SPR, making them suitable for sensing applications.
  • Adsorption of volatile organic compounds (VOCs) alters the dielectric environment around nanoparticles.

Purpose of the Study:

  • To probe the optical response of gold nanoparticle SPR to TCE and PCE adsorption using cavity ring-down spectroscopy.
  • To elucidate size-dispersion effects and adsorption kinetics using Extended Mie theory.
  • To determine the minimum detectable concentrations of TCE and PCE.

Main Methods:

  • Cavity ring-down spectroscopy with a linear resonator and intracavity flow cell.
  • Utilized an ultrathin gold film with a Gaussian distribution of nanospheres.

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  • Applied Extended Mie theory for coated spheres with size-dependent dielectric functions.

    • Main Results:

    • Determined gold nanosphere size distribution (mean 4.5 nm, SD 1.1 nm) via atomic force microscopy.
    • Cavity ring-down measurements achieved 0.1% relative ring-down time precision.
    • Minimum detectable concentrations of 2 x 10(-8) mol/L for PCE and 7 x 10(-8) mol/L for TCE were achieved.

    Conclusions:

    • Cavity ring-down spectroscopy is a powerful tool for studying gas-phase adsorption on gold nanoparticles.
    • The study demonstrates size-dependent SPR sensitivity and adsorption kinetics.
    • High sensitivity achieved for detecting chlorinated solvents like PCE and TCE.