Adsorption mechanisms of sulfathiazole on gold,silver and copper surfaces studied by SERS |
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Institution: | 1. Division of Analytical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia;2. INA — Industrija nafte, d.d., HR-10000 Zagreb, Croatia;3. Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, PO Box 180, HR-10002 Zagreb, Croatia;4. Faculty of Physics, Babeş-Bolyai University, Kogălniceanu 1, RO-400084 Cluj-Napoca, Romania |
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Abstract: | Surface-enhanced Raman scattering (SERS) of sulfathiazole was studied in gold, silver and copper colloids as well as on a gold plate. SERS spectra of sulfathiazole in gold and silver colloids indicated chemisorption of molecules on the metal nanoparticles through the amide nitrogen, with the phenyl moiety orthogonally placed and the thiazole ring almost parallel positioned towards the metal surface. Although selectively enhanced phenyl bands pointed to a very similar position of the sulfathiazole molecules on the copper colloid, a chemical bonding was not implied. Unlike adsorption mechanisms and position of the molecules on the colloid metal surfaces, a sideway adsorption of sulfathiazole on the gold plate was proposed. Hereby, both, the amide nitrogen and the thiazole nitrogen were considered responsible for approaching of sulfathiazole to the gold enhancing surface. |
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Keywords: | Sulfathiazole SERS Raman spectroscopy Metal colloids |
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