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Published on: July 21, 2018
Characterization of a variable angle reflection Fourier transform infrared accessory modified for surface plasmon
Nicola Menegazzo1, Laurel L Kegel, Yoon-Chang Kim
1University of Delaware, Department of Chemistry and Biochemistry, 002 Lammot Dupont Lab, Newark, Delaware 19716, USA.
Applied Spectroscopy
|October 8, 2010
Summary
Researchers modified the AutoSeagull accessory for Fourier transform infrared (FT-IR) spectrometers to perform surface plasmon resonance (SPR) spectroscopy. This adaptation enhances sensitivity to refractive index changes using infrared wavelengths for advanced material analysis.
Area of Science:
- Spectroscopy
- Materials Science
- Analytical Chemistry
Background:
- The Harrick AutoSeagull is a versatile accessory for Fourier transform infrared (FT-IR) spectrometers.
- Total internal reflection measurements are foundational for prism-based surface plasmon resonance (SPR) spectroscopy.
- Integrating SPR with FT-IR offers a powerful analytical platform.
Purpose of the Study:
- To modify the AutoSeagull accessory for SPR spectroscopy.
- To enable easy integration of SPR into common FT-IR spectrometers.
- To investigate the performance and sensitivity of the modified system.
Main Methods:
- Modification of the AutoSeagull accessory by incorporating slit apertures.
- Utilizing gold as the plasmon-supporting metal.
- Performing SPR spectroscopy using FT-IR spectrometers in the near-infrared (NIR) and mid-infrared (mid-IR) ranges.
Main Results:
- The modified AutoSeagull allows SPR spectroscopy on standard FT-IR instruments.
- SPR spectroscopy using NIR/mid-IR wavelengths demonstrates higher sensitivity to refractive index changes compared to visible wavelengths.
- Incorporating slit apertures sharpens SPR dips but increases spectral noise.
- Analytical performance was evaluated, including dip quality, angular dependence, and sensitivity to bulk refractive index changes.
Conclusions:
- The modified AutoSeagull provides a simple and effective method for performing SPR spectroscopy with FT-IR instruments.
- The use of infrared wavelengths enhances the sensitivity of SPR for refractive index sensing.
- The system offers flexibility and improved analytical capabilities for material characterization.
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