Fourier Transform Infrared Spectroscopy Using Polarization Modulation and Polarization Selective Techniques for Internal and External Reflection Geometries: Investigation of Self-Assembled Octadecylmercaptan on a Thin Gold Film
| Autor: | K.A. Assiongbon, Janos H. Fendler, Dipankar Roy, Eliza Hutter |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Total internal reflection
Infrared Chemistry business.industry Infrared spectroscopy Polarization (waves) Surfaces Coatings and Films symbols.namesake Optics Fourier transform Monolayer Materials Chemistry symbols Physical and Theoretical Chemistry Fourier transform infrared spectroscopy business Spectroscopy |
| Zdroj: | The Journal of Physical Chemistry B. 107:7812-7819 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp034910p |
| Popis: | By combining the polarization modulation (PM) technique with Fourier transform infrared reflection−absorption spectroscopy (FT-IRRAS), one can substantially improve the detection sensitivity and data collection efficiency. Using PM, the step of “background subtraction” can be eliminated for quantifying adsorbed species or covalently attached monolayers, and the IR spectra can be taken in situ in aqueous solutions. We demonstrate here that such a combination of PM and FT-IRRAS is possible, not only for external reflection measurements, but also for the attenuated total internal reflection (ATR) arrangement. The unique advantage of this second combination is that it couples the surface sensitivity of ATR with the experimental convenience and rapid data collection capability of polarization modulated FT-IRRAS. In the present work, we combine numerical calculations with experiments to study octadecylmercaptan (ODM) monolayers, self-assembled onto a gold-coated calcium fluoride prism. Results, including IR spe... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|