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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Concurrent surface enhanced infrared and Raman spectroscopy with single molecule sensitivity.

Mark S Anderson1

  • 1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, California 91109, USA.

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This study demonstrates simultaneous Surface-Enhanced Infrared Absorption (SEIRA) and Surface-Enhanced Raman Spectroscopy (SERS) for highly sensitive trace molecule analysis. This combined technique offers complementary data from a single location on plasmonic substrates.

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Surface-enhanced spectroscopy techniques like SEIRA and SERS offer high sensitivity for molecular analysis.
  • Simultaneous acquisition from the same location is crucial for correlative analysis.
  • Plasmonic substrates are key to enhancing spectroscopic signals.

Purpose of the Study:

  • To develop and demonstrate a method for concurrent SEIRA and SERS measurements.
  • To investigate the enhancement of SEIRA signals through optical photothermal detection.
  • To showcase the application of this technique for trace surface analysis.

Main Methods:

  • Utilized an optical photothermal infrared spectrometer coupled with a Raman spectrometer.
  • Employed plasmonic substrates including silver nanospheres and a gold-coated AFM tip.
  • Performed nano-sampling of analytes onto the AFM tip for localized analysis.

Main Results:

  • Achieved simultaneous SEIRA and SERS measurements from identical locations on plasmonic substrates.
  • Demonstrated enhanced SEIRA signals due to optical photothermal detection.
  • Successfully analyzed individual and mixed analytes like Buckminsterfullerene and 1,2-bis(4-pyridyl) ethylene.

Conclusions:

  • Concurrent SEIRA and SERS acquisition is a unique and powerful approach for trace surface analysis.
  • This method provides complementary infrared and Raman data, enhancing analytical capabilities.
  • Potential applications include analyzing trace materials and extraterrestrial samples.