Listar por autor "López-Tocón, Isabel"
Mostrando ítems 21-33 de 33
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Procesos de Resonancia Raman en Espectroscopía SERS
(UMA Editorial, 2015)Se han estudiado diversas cuestiones fundamentales relacionadas con el origen de la enorme intensificación que experimenta el espectro Raman de una molécula situada en las proximidades de ciertas superficies metálicas. La ... -
Proving the Dual Electronic Structure of Charged Metal-Molecule Interfaces: Surface-Enhanced Raman Scattering of Cyanide Adsorbed on a Nanostructured Silver Electrode
Valdivia Mantas, Samuel; Aranda, Daniel; Ávila-Ferrer, Francisco José
; Soto-Martín, Juan; López-Tocón, Isabel; Otero-Fernández-de-Molina, Juan Carlos[et al.] (ACS Publications, 2020-07-21)
Experimental and theoretical calculations confirm, for the first time, the existence of two different kinds of electronic structures of a surface complex formed by a particular molecule bonded to charged metal electrodes, ... -
Remembering the old propensity rules of the electromagnetic enhancement mechanism of SERS: reorientation of pyridine on silver electrode induced by the applied potential
Valdivia Mantas, Samuel; García-González, Francisco; Aranda Ruiz, Daniel; Ávila-Ferrer, Francisco José; López-Tocón, Isabel; Soto, Juan; Otero, Juan Carlos[et al.] (ACS, 2024)
Electrochemical SERS of pyridine adsorbed on a silver electrode has been analyzed by comparing the spectra to the calculated normal Raman and resonance Raman intensities of model systems of pyridine bonded to linear silver ... -
Selection rules of surface-enhanced Raman scattering: the role of the out-of-plane vibrations
Aranda Ruiz, Daniel; Valdivia Mantas, Samuel; Ávila-Ferrer, Francisco José; Soto-Martín, Juan; López-Tocón, Isabel; Otero-Fernández-de-Molina, Juan Carlos[et al.] (2019-07-25)
The electromagnetic/plasmonic (SERS-PL) and the chemical (usually involving resonant photoinduced metal-adsorbate (M-A) charge transfer processes (SERS-CT:M-A+hn-->M+-A-)) mechanisms are recognized as the two main contributions ... -
Sensing Bisphenol A by Means of Surface-Enhanced Raman Spectroscopy and DFT Calculations to Elucidate the Enhancement Mechanism That Dominates the Spectrum
Lemos de Souza, Michele; Valdivia Mantas, Samuel; Otero-Fernández-de-Molina, Juan Carlos; López-Tocón, Isabel (IOAP-MDPI, 2023-01-20)
Surface-Enhanced Raman Spectroscopy (SERS) was employed as a spectroscopic tool to detect Bisphenol A (BPA), a building block in polycarbonate and epoxy resins or an additive in other polymer plastics like PVC, which has ... -
El SERS como sensor de pH en entornos nanométricos
López-Tocón, Isabel (2015-02-09)
La Espectroscopia SERS (Surface-Enhanced Raman Spectroscopy) se caracteriza por la enorme intensificación de la señal Raman de una molécula cuando se encuentra en las proximidades de una superficie metálica rugosa a escala ... -
Surface-enhanced photoinduced charge transfer processes in metal-molecule nanoclusters
Centeno-Benigno, Silvia Patricia; Ruano, Cristina; Roman-Perez, Jessica; López-Tocón, Isabel; Soto-Martín, Juan; Otero-Fernández-de-Molina, Juan Carlos[et al.] (2013-10-29)
This work deals with the unexplained efficiency of the electrode potential (EV) in tuning the energy of Charge Transfer (ECT) electronic states of hybrid systems formed by molecules and metal nanostructures. Huge energy ... -
The role of the electrolyte on the SERS spectra of pyridine
SERS spectra of pyridine has been recorded on a silver electrode in a potential range from 0.0 to -1.20 V with a saline solution, pyridine / KCl (0.1M / 0.1M), by using the 514.5 nm exciting line by us [1]. Under these ... -
Theoretical Approaches for Modeling the Effect of the Electrode Potential in the SERS Vibrational Wavenumbers of Pyridine Adsorbed on a Charged Silver Surface
Aranda, Daniel; Valdivia Mantas, Samuel; Soto-Martín, Juan; López-Tocón, Isabel; Ávila, Francisco; Otero-Fernández-de-Molina, Juan Carlos[et al.] (Frontiers in Chemistry, section Analytical Chemistry, 2019-06-05)
Vibrational wavenumbers of pyridine adsorbed on a silver electrode have been correlated to the calculated ones from different theoretical approaches based on DFT methods. The vibrational tuning caused by the electrode ... -
Las TIC como elemento innovador en el proceso de enseñanza-aprendizaje de la asignatura de Química Física
López-Tocón, Isabel (2016-06-27)
Se ha desarrollado un entorno virtual para la asignatura de Química Física General que se imparte en el primer curso del Grado en Química de la UMA, haciendo uso de la plataforma educativa Moodle. Se han creado diversos ... -
Using Surface-enhanced Raman scattering to probe the capacitance of metallic nanostructures
Centeno-Benigno, Silvia Patricia; Ruano, Cristina; Roman-Perez, Jessica; López-Tocón, Isabel; Otero-Fernández-de-Molina, Juan Carlos; Soto-Martín, Juan[et al.] (2013)
Though it is generally accepted that the electromagnetic mechanism related to the excitation of localized plasmons of the metal surface is the most important contribution in SERS, the chemical interaction between molecule ... -
Voltage selection of physisorbed or chemisorbed 4-cyanobenzoate on a nanostructured silver electrode and the dual electronic structure of charged metal-molecule hybrids.
Valdivia Mantas, Samuel; Ávila-Ferrer, Francisco José; Otero-Fernández-de-Molina, Juan Carlos; López-Tocón, Isabel (Elsevier, 2021-11-30)
Applied electric potentials tune SERS wavenumbers due to vibrational Stark effect, but some modes of 4CNB- show two differentiated regions, being redshifted at more negative potentials than the potential of zero charge of ... -
Voltage tuning of photoinduced charge transfer resonances between 2,2′-bipyridine and a nanostructured silver electrode.
Valdivia Mantas, Samuel; Aranda, Daniel; Otero-Fernández-de-Molina, Juan Carlos; López-Tocón, Isabel (2023-11-17)
The effect of applied electric potentials and excitation wavelengths (785, 532, 473 nm) on the Surface-Enhanced Raman scattering (SERS) of 2,2′-bipyridine (2,2′-bpy) adsorbed on a silver electrode has been analyzed on the ...