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Issue 34, 2009
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High performance gold nanorods and silver nanocubes in surface-enhanced Raman spectroscopy of pesticides

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Abstract

The behavior of Au nanorods and Ag nanocubes as analytical sensors was evaluated for three different classes of herbicides. The use of such anisotropic nanoparticles in surface-enhanced Raman scattering (SERS) experiments allows the one to obtain the spectrum of crystal violet dye in the single molecule regime, as well as the pesticides dichlorophenoxyacetic acid (2,4-D), trichlorfon and ametryn. Such metallic substrates show high SERS performance at low analyte concentrations making them adequate for use as analytical sensors. Density functional theory (DFT) calculations of the geometries and vibrational wavenumbers of the adsorbates in the presence of silver or gold atoms were used to elucidate the nature of adsorbate–nanostructure bonding in each case and support the enhancement patterns observed in each SERS spectrum.

Graphical abstract: High performance gold nanorods and silver nanocubes in surface-enhanced Raman spectroscopy of pesticides

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Article information


Submitted
09 Mar 2009
Accepted
22 Jun 2009
First published
29 Jul 2009

Phys. Chem. Chem. Phys., 2009,11, 7491-7498
Article type
Paper

High performance gold nanorods and silver nanocubes in surface-enhanced Raman spectroscopy of pesticides

J. C. Santos Costa, R. A. Ando, A. C. Sant’Ana, L. M. Rossi, P. S. Santos, M. L. A. Temperini and P. Corio, Phys. Chem. Chem. Phys., 2009, 11, 7491
DOI: 10.1039/B904734D

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