2026-06-03T01:29:50Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/176632026-02-03T12:00:14Zcom_10630_2254col_10630_37959
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
López-Ramírez, María Rosa
author
Otero-Fernández-de-Molina, Juan Carlos
author
Soto-Martín, Juan
author
Castro, Jose Luis
author
Arenas Rosado, Juan Francisco
2019-05-16T08:16:17Z
2019-05-16T08:16:17Z
2019-05-16
https://hdl.handle.net/10630/17663
When a molecule is adsorbed on some metallic nanostructured surfaces such as silver, copper or gold, it can undergo an enormous enhancement of the Raman signal giving rise to the so called Surface-Enhanced Raman Scattering (SERS). The high sensitivity of this effect allows an accurate structural study of adsorbates at very low concentrations. The SERS effect has historically been associated with the substrate roughness on two characteristic length scales. Surface roughness on the 10 to 100 nm length scale supports localized plasmon resonances which are considered as the dominant enhancement mechanism of SERS (Electromagnetic Enhancement Mechanism: SERS-EM). It is usually accepted that these electromagnetic resonances can increase the scattered intensity by an average factor of ca. 104 to 107. A secondary mechanism often thought to require atomic scale roughness is referred to as Charge Transfer (CT) Enhancement Mechanism (SERS-CT). This mechanism involves the photoinduced transfer of an electron from the metal to the adsorbate or vice versa and involves new electronic excited CT states which result from adsorbate–substrate chemical interactions. It is also estimated that such SERS-CT mechanism can enhance the scattering cross-section by a factor of ca. 10 to 102. These two mechanisms can operate simultaneously, depending on the particular systems and experimental conditions, making difficult to recognize each one and to estimate their relative magnitude in a particular spectrum.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Nanopartículas
Fundamentals and Applications of Surface-Enhanced Raman Spectroscopy (SERS)
conference output
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URL
https://riuma.uma.es/bitstreams/d3590960-80fc-43dc-b619-b9a54994e913/download
File
MD5
8b72e9718659f5ed9e033c8779129e2e
578594
application/pdf
Abstract MR Lopez-Ramirez.pdf