Selective molecular recognition of polycyclic aromatic hydrocarbons (PAHs) on Calix[4]arene-functionalized Ag nanoparticles by surface-enhanced raman scattering

PATRICIO ALEJANDRO LEYTON BONGIORNO, S. Sanchez-Cortes, J. V. Garcia-Ramos, C. Domingo, M. Campos-Vallette, C. Saitz, R. E. Clavijo

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115 Scopus citations

Abstract

Trace concentrations of polycyclic aromatic hydrocarbons (PAHs) have been successfully detected using surface-enhanced Raman scattering (SERS) spectroscopy. For such purpose, new SERS substrates have been developed, consisting of Ag nanoparticles, either in suspension or immobilized on glass, obtained by a new method and covered by adsorbed self-assembled calix[4]arene molecules. Among the assayed calix[4]arenes, the 25,27-dicarboethoxy-26,28- dihydroxy-p-tert-butylcalix[4]arene host molecule displays analytical selectivity to the PAH guest systems bearing four benzene rings, mainly pyrene. The host - guest interaction mechanism seems to take place through a π-π stacking interaction leading to a charge transfer between the complex and the metallic surface, which may also induce a notable influence on the surface charge of the metallic nanoparticle.

Original languageEnglish
Pages (from-to)17484-17490
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number45
DOIs
StatePublished - 11 Nov 2004

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