Adsorption of lucigenin on Ag nanoparticles studied by surface-enhanced Raman spectroscopy: effect of different anions on the intensification of Raman spectra

The normal Raman and surface‐enhanced Raman spectra of acridine derivative lucigenin were analysed on Ag colloid. The effect of different anions on the adsorption mechanism of this molecule was also investigated under different experimental conditions, i.e. excitation wavelength and adsorbate concen...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2003-03, Vol.34 (3), p.227-233
Main Authors: Millán, Juan I., Garcia-Ramos, José V., Sanchez-Cortes, Santiago, Rodríguez-Amaro, Rafael
Format: Article
Language:English
Subjects:
Adsorption
Anions
Chlorides
colloid
lucigenin
Orientation
Raman spectra
Raman spectroscopy
Silver
Surface chemistry
surface-enhanced Raman scattering
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Summary:The normal Raman and surface‐enhanced Raman spectra of acridine derivative lucigenin were analysed on Ag colloid. The effect of different anions on the adsorption mechanism of this molecule was also investigated under different experimental conditions, i.e. excitation wavelength and adsorbate concentration, in order to study the different adsorption of the molecule on the metal under different conditions. The adsorption of lucigenin, which is under the dicationic form, changes depending on the anion added to the surface: in the presence of chloride the molecule forms an ion pair, with a predominant perpendicular orientation, whereas in the presence of sulphate and nitrate, the adsorption is weak and the dication seems to adopt a different orientation with respect to the surface. Copyright © 2003 John Wiley & Sons, Ltd.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.981