Molecular adsorbates under high pressure: a study using surface-enhanced Raman scattering spectroscopy

[摘要] Molecules adsorbed on metal surfaces were studied in a diamond anvil cell with Ar pressure-transmission medium up to several GPa pressure using Raman spectroscopy. The problem with studying molecules on surfaces is the small number density. This problem was overcome using photonic substrates to amplify the Raman intensity by factors of 106in the case of self-assembled monolayers on Ag-coated nanoarrays, where the probed region contained ∼109molecules, and >109in the case of the dye Rhodamine 6G on Ag nanoaggregates, where 6molecules were probed. Pressure effects on the adsorbate vibrations and on the underlying nanostructures are discussed.

[发布机构] School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Matthews Ave., Urbana; IL; 61801, United States^1

[关键词] Adsorbate vibrations;Diamond-anvil cell;Metal surfaces;Molecular adsorbate;Nanoaggregates;Number density;Raman intensities;Surface-enhanced Raman scattering spectroscopy