RT Conference Proceedings
T1 Surface-enhanced photoinduced charge transfer processes in metal-molecule nanoclusters
A1 Centeno-Benigno, Silvia Patricia
A1 Ruano, Cristina
A1 Roman-Perez, Jessica
A1 López-Tocón, Isabel
A1 Soto-Martín, Juan
A1 Otero-Fernández-de-Molina, Juan Carlos
K1 Espectroscopía Raman
K1 Nanopartículas
AB 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 gains (G) of up to 5 eV/V observed in electrochemical SERS experiences have been tentatively explained by a local increase of the electric potential at specific adsorption sites.[1] This gain, which is in conflict with the classical picture of the metal-adsorbate CT mechanism (G=1), can be quite relevant since it means that a relatively small change in the applied voltage can produce a large shift in the CT states, and consequently, it can greatly modify the resonant conditions in a SERS experiment. [2] Supported on electronic structure calculations of metal-molecule nanoclusters, we are able to elucidate that this “anomalous” gain is mainly due to two different contributions, firstly, the sensitivity of the CT electronic states of each particular metal-molecule system on the effective charge excess of the metal, and, secondly, to an enhanced electric capacitance of the metallic nanocluster with respect to the macroscopic values. We associate this last contribution with the so-called “edge effect” that causes inhomogeneities in the density charge at local sites of the metallic surface which could correspond to the very popular "hot spots" between the SERS community.[1] L. Cui, D-Y Wu, A. Wang, B. Ren, Z-Q Tian, J. Phys. Chem. C, 2010, 114, 16588-16595.[2] A. Otto, Surface Science, 1984, 138, 319-338
YR 2013
FD 2013-10-29
LK http://hdl.handle.net/10630/6183
UL http://hdl.handle.net/10630/6183
LA eng
NO Resumen de conferencia presentada en el congreso ICP2013 en Lovaina (Bélgica) en julio de 2013
NO Universidad de Málaga. Campus de Excelencia Internacional de Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 3 mar 2026