Specific behavior of the p-aminothiophenol - Silver sol system in their Ultra-Violet-Visible (UV-Visible) and Surface Enhanced Raman (SERS) spectra

Firkala, Tamás and Tálas, Emília and Mihály, Judith and Imre, Timea and Kristyán, Sándor (2013) Specific behavior of the p-aminothiophenol - Silver sol system in their Ultra-Violet-Visible (UV-Visible) and Surface Enhanced Raman (SERS) spectra. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 410. pp. 59-66. ISSN 0021-9797

Text REALba 2013 okt.pdf Restricted to Repository staff only Download (1MB) | Request a copy

Abstract

The UV-Visible and Surface Enhanced Raman Spectroscopy (SERS) behavior of silver sol (a typical SERS agent) were studied in the presence of different bifunctional thiols such as p-aminothiophenol, p-mercaptobenzoic acid, p-nitrothiophenol, p-aminothiophenol hydrochloride, and 2-mercaptoethylamine hydrochloride in diluted aqueous solution. Our results confirm that the p-aminothiophenol induced aggregation of citrate stabilized silver colloid originates from its electrostatic nature, as well as the azo-bridge formation cannot be the reason of the observed time dependent UV-Visible spectra. Based on our parallel SERS and electrospray ionization mass spectrometry measurements, we have concluded that certain amount of oxidized form of the probe molecule has to be present for the so-called b2-mode enhancement in the SERS spectrum of p-aminothiophenol. Our findings seem to support the idea that the azo-bridge formation is responsible for the b2-mode enhancement in the SERS spectrum of p-aminothiophenol. © 2013 Elsevier Inc.

Actions (login required)

Edit Item