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

Tamás Firkala, Emília Tálas, J. Mihály, T. Imre, S. Kristyán

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalJournal of Colloid and Interface Science
Volume410
DOIs
Publication statusPublished - Nov 15 2013

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Polymethyl Methacrylate
Sols
Silver
Raman spectroscopy
Cysteamine
Electrospray ionization
Colloids
Sulfhydryl Compounds
Citric Acid
Mass spectrometry
Electrostatics
Agglomeration
4-aminothiophenol
Molecules
Acids

Keywords

  • 2-Mercaptoethylamine hydrochloride
  • Azo-formation
  • B-Mode enhancement
  • P-Aminothiophenol
  • Silver colloid
  • Surface Enhanced Raman Spectroscopy
  • Time dependent UV-Visible spectra

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

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title = "Specific behavior of the p-aminothiophenol - Silver sol system in their Ultra-Violet-Visible (UV-Visible) and Surface Enhanced Raman (SERS) spectra",
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.",
keywords = "2-Mercaptoethylamine hydrochloride, Azo-formation, B-Mode enhancement, P-Aminothiophenol, Silver colloid, Surface Enhanced Raman Spectroscopy, Time dependent UV-Visible spectra",
author = "Tam{\'a}s Firkala and Em{\'i}lia T{\'a}las and J. Mih{\'a}ly and T. Imre and S. Kristy{\'a}n",
year = "2013",
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T1 - Specific behavior of the p-aminothiophenol - Silver sol system in their Ultra-Violet-Visible (UV-Visible) and Surface Enhanced Raman (SERS) spectra

AU - Firkala, Tamás

AU - Tálas, Emília

AU - Mihály, J.

AU - Imre, T.

AU - Kristyán, S.

PY - 2013/11/15

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AB - 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.

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