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Surface plasmon resonance near-infrared spectroscopy
Akifumi Ikehata1, Tamitake Itoh, Yukihiro Ozaki
1Department of Chemistry and Research Center for Near Infrared Spectroscopy, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan.
Analytical Chemistry
|November 2, 2004
Summary
We developed a new Surface Plasmon Resonance (SPR) method for Near-Infrared (NIR) spectroscopy, enhancing sensitivity by 100 times. This SPR-NIR technique improves microanalysis and surface science applications.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Surface Science
Background:
- Near-infrared (NIR) spectroscopy has limited microanalysis applications due to low absorptivity.
- Developing sensitive detection methods for NIR is crucial for expanding its analytical capabilities.
Purpose of the Study:
- To develop a highly sensitive detection method for NIR spectroscopy.
- To enable NIR spectroscopy for microanalysis and surface science applications.
Main Methods:
- Utilized absorption-sensitive surface plasmon resonance (SPR) with a Kretschmann configuration.
- Employed fine angular adjustment of incident light to tune SPR peaks to sample absorption bands.
- Investigated the influence of wavelength, incident angle, and gold film thickness on SPR peak intensity.
Main Results:
- Achieved approximately 100-fold enhancement in absorbance compared to conventional methods.
- Demonstrated the feasibility of SPR-NIR spectroscopy for enhanced NIR detection.
- Characterized the absorption-sensitive SPR in the NIR region.
Conclusions:
- SPR-NIR spectroscopy significantly enhances NIR detection sensitivity.
- This method opens new avenues for microanalysis and surface science using NIR spectroscopy.
- The developed technique offers a powerful tool for analyzing samples with low absorptivity.