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Castro JL, Arenas JF, López-Ramírez MR, et al. Surface-enhanced Raman scattering of hydroxybenzoic acids adsorbed on silver nanoparticles. J Colloid Interface Sci. 2009;332(1):130-5doi: 10.1016/j.jcis.2008.12.029.
Castro, J. L., Arenas, J. F., López-Ramírez, M. R., Peláez, D., & Otero, J. C. (2009). Surface-enhanced Raman scattering of hydroxybenzoic acids adsorbed on silver nanoparticles. Journal of colloid and interface science, 332(1), 130-5. https://doi.org/10.1016/j.jcis.2008.12.029
Castro, J L, et al. "Surface-enhanced Raman scattering of hydroxybenzoic acids adsorbed on silver nanoparticles." Journal of colloid and interface science vol. 332,1 (2009): 130-5. doi: https://doi.org/10.1016/j.jcis.2008.12.029
Castro JL, Arenas JF, López-Ramírez MR, Peláez D, Otero JC. Surface-enhanced Raman scattering of hydroxybenzoic acids adsorbed on silver nanoparticles. J Colloid Interface Sci. 2009 Apr 01;332(1):130-5. doi: 10.1016/j.jcis.2008.12.029. Epub 2009 Jan 22. PMID: 19167008.
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J Colloid Interface Sci. 2009 Apr 01;332(1):130-5. doi: 10.1016/j.jcis.2008.12.029. Epub 2009 Jan 22.

Surface-enhanced Raman scattering of hydroxybenzoic acids adsorbed on silver nanoparticles.

Journal of colloid and interface science

J L Castro, J F Arenas, M R López-Ramírez, D Peláez, J C Otero

Affiliations

  1. Department of Physical Chemistry, Faculty of Sciences, University of Malaga, E-29071 Malaga, Spain.

PMID: 19167008 DOI: 10.1016/j.jcis.2008.12.029

Abstract

Surface-enhanced Raman scattering (SERS) of hydroxybenzoic acids has been studied on silver sols in H(2)O and D(2)O solutions. The adsorption behavior of 4-hydroxybenzoic acid (4HBA) is different from that of salicylic (2HBA) and 3-hydroxybenzoic (3HBA) acids. It was concluded that 4HBA is adsorbed on silver nanoparticles (Ag(n)) as either oxidobenzoate (A(2-)) or hydroxybenzoate (A(-)), depending on the pH of the solution, given rise to a flat orientation. Both 2HBA and 3HBA acids are always adsorbed as hydroxybenzoates anions (A(-)) at pH >or=5 and link to the metal through the carboxylate group (Ag(n)--A(-)), standing more or less perpendicular to the metal surface. In the case of these monoanions, the selective enhancement of the bands is due mainly to a resonant electron or charge transfer process (ET or CT) from the metallic nanoparticles to the adsorbates, yielding the transient formation of the respective radical dianions (Ag(+)(n)--A(2-)). It is found that the enhanced bands, and especially the mode 8a;nu(ring), are related to the difference between the equilibrium structures of the adsorbate in its ground (A(-)) and CT-excited (A(2-)) states. In the SERS spectrum of 4HBA dianion, the contribution of CT mechanism is not observed.

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