2026-04-19T17:22:34Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/93182024-07-02T00:05:23Zcom_10259_3844com_10259_5086com_10259_2604col_10259_3845

Hernández Muñoz, Sheila Pérez Estébanez, Martín Cheuquepan Valenzuela, William Perales Rondon, Juan Víctor Heras Vidaurre, Aránzazu Colina Santamaría, Álvaro 2024-07-01T06:53:52Z 2024-07-01T06:53:52Z 2023-10-23 0003-2700 http://hdl.handle.net/10259/9318 10.1021/acs.analchem.3c01172 1520-6882 Raman signal enhancement is fundamental to develop different analytical tools for chemical analysis, interface reaction studies, or new materials characterization, among others. Thus, phenomena such as surface-enhanced Raman scattering (SERS) have been used for decades to increase the sensitivity of Raman spectroscopy, leading to a huge development of this field. Recently, an alternative method to SERS for the amplification of Raman signals has been reported. This method, known as electrochemical surface oxidation-enhanced Raman scattering (EC-SOERS), has been experimentally described. However, to date, it has not yet been fully understood. In this work, new experimental data that clarify the origin of the Raman enhancement in SOERS are provided. The use of a complete and unique set of combined spectroelectrochemistry techniques, including time-resolved operando UV–vis absorption, fluorescence, and Raman spectroelectrochemistry, reveals that such enhancement is related to the generation of dielectric or semiconductor nanocrystals on the surface of the electrode and that the interaction between the target molecule and the dielectric substrate is mediated by metal cations. According to these results, the interaction metal electrode–nanocrystal–metal cation–molecule is proposed as being responsible for the Raman enhancement in Ag and Cu substrates. Elucidation of the origin of the Raman enhancement will help to promote the rational design of SOERS substrates as an attractive alternative to the well-known SERS phenomenon. This work was funded by the Ministerio de Ciencia e Innovación and Agencia Estatal de Investigación (MCIN/AEI/10.13039/501100011033 and PID2020-113154RB-C21), Ministerio de Ciencia, Innovación y Universidades (RED2022-134120-T). application/pdf eng ACS Publications Analytical Chemistry. 2023, V. 95, n. 44, p. 16070-16078 https://doi.org/10.1021/acs.analchem.3c01172 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Química analítica Electroquímica Chemistry, Analytic Electrochemistry Raman, UV–Vis Absorption, and Fluorescence Spectroelectrochemistry for Studying the Enhancement of the Raman Scattering Using Nanocrystals Activated by Metal Cations info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Analytical Chemistry 95 44 16070 16078