Raman spectroscopy of organic molecules physisorbed onto graphitic carbon surfaces.

摘要

The utility of Raman spectroscopy for studying organic molecules physisorbed onto various graphitic carbon surfaces was explored. A solution phase procedure was used to deposit the adsorbate molecules. The majority of the adsorbate spectra were acquired under ambient atmospheric conditions. The adsorbate molecules studied were ;A procedure was developed for the determination of adsorbate Raman scattering cross sections. These values were compared with solution phase values. For the nonresonant (or preresonant) scatterers BMB, BPBD, and AQDS; the adsorbate Raman scattering cross sections were enhanced by a factor of ;The ability of graphitic carbon surfaces to quench the fluorescence of adsorbed molecules was explored with the goal of estending the utility of Raman spectroscopy to a wider range of chemical systems. The effect of graphitic carbon surface roughness and microporosity on adsorbate Raman signal intensities was also explored. Finally, the potential use of adsorbate Raman spectra as probes of various graphitic carbon properties was investigated.