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On the SERS depolarization ratio

100%

Foti A., D’Andrea C., Messina E., Irrera A., Maragò O. M., Fazio B., Gucciardi P. G.

Nanospectroscopy

2014

vol. 1

issue 1

The Raman depolarization ratio is a quantity that can be easily measured experimentally and offers unique information on the Raman polarizability tensor of molecular vibrations. In Surface Enhanced Raman Scattering (SERS), molecules are near-field coupled with optical nanoantennas and their scattering properties are strongly affected by the radiation patterns of the nanoantenna. The polarization of the SERS photons is consequently modified, affecting, in a non trivial way, the measured value of the SERS depolarization ratio. In this article we elaborate a model that describes how the SERS depolarization ratio is influenced by the nanoantenna re-radiation properties, suggesting how to retrieve information on the Raman polarizability from SERS experiments.

SERS approach for Zn(II) detection in contaminated soil

88%

Szabó L., Leopold L., Cozar B., Leopold N., Herman K., Chiş V.

Open Chemistry

2011

vol. 9

issue 3

410-414

Soil contamination by metals is a common problem encountered in many industrialized countries. In this work we present a new approach for heavy metals detection by using surface-enhanced Raman scattering (SERS) spectroscopy. Zn(II) can be clearly determined by SERS in contaminated soil by using 4-(2-pyridylazo) resorcinol (PAR) as chelating molecule for the metal ion. The SERS spectra of PAR, of its metal chelates and of the soil extract-PAR mixture were recorded using a hydroxylamine reduced silver colloid. An excellent match of the PAR-contaminated soil extracts SERS spectrum to the Zn(PAR)2 SERS spectrum can be observed, demonstrating the presence of Zn(II) in the soil probes. Density functional theory (DFT) based calculations were also performed for a reliable assignment of SERS spectra.

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1 Foti A.

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1 Herman K.

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1 Leopold L.

1 Leopold N.

1 Maragò O. M.

1 Messina E.

1 Szabó L.

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On the SERS depolarization ratio

SERS approach for Zn(II) detection in contaminated soil