This article was published online on 7 October 2013. This notice was included in the online version to indicate that the caption of Figure 5 and the citations of the supporting information have been modified [17 October 2013].
DFT study and quantitative detection by surface-enhanced Raman scattering (SERS) of ethyl carbamate†
Article first published online: 7 OCT 2013
Copyright © 2013 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 44, Issue 11, pages 1491–1496, November 2013
How to Cite
Yang, D., Mircescu, N. E., Zhou, H., Leopold, N., Chiş, V., Oltean, M., Ying, Y. and Haisch, C. (2013), DFT study and quantitative detection by surface-enhanced Raman scattering (SERS) of ethyl carbamate. J. Raman Spectrosc., 44: 1491–1496. doi: 10.1002/jrs.4375
- Issue published online: 8 NOV 2013
- Article first published online: 7 OCT 2013
- Manuscript Accepted: 12 AUG 2013
- Manuscript Revised: 17 JUL 2013
- Manuscript Received: 12 MAY 2013
- Research Fund for the Doctoral Program of Higher Education. Grant Number: 20120101130009
- China Scholarship Council. Grant Number: POSDRU/107/1.5/S/76841
- Sectoral Operational Programme for Human Resources Development
- European Social Fund
- ethyl carbamate
Ethyl carbamate (EC), a potentially toxic compound, is found in alcoholic beverages and fermented foodstuff. A combined experimental and theoretical study of Raman on EC is reported in this work for the first time. The Raman bands observed for EC in solid phase are characteristic for the carbonyl group, C―C, C―H and N―H stretching and deformation vibrations. These spectral features coupled with a pKa study allowed establishing the neutral species of EC present in the aqueous solutions experimentally tested at different concentrations. In addition, by performing a density functional theory study in the gas phase, the calculated geometry, the harmonic vibrational modes, and the Raman scattering activities of EC were found to be in good agreement with our experimental data and helped establish the surface-enhanced Raman scattering (SERS) behavior and EC adsorption geometry on the silver surfaces. The Raman peak at 1006 cm−1, assigned to the υs(CC) + ω(CH) modes, the strongest and best reproducible peak in the SERS spectra, was used for a quantitative evaluation of EC. The limit of detection, which corresponds to a signal-to-noise ratio equal to 3, was found to be 2 × 10−7 M (17.8 µg l−1). SERS spectra obtained by using hydroxylamine hydrochloride-reduced silver nanoparticles provide a fast and reproducible qualitative and quantitative determination of EC in aqueous solution. Copyright © 2013 John Wiley & Sons, Ltd.