Quantitative electrochemical SERS of flavin at a structured silver surface

In situ electrochemical surface enhanced Raman spectra (SERS) for an immobilized monolayer of a flavin analogue (isoalloxazine) at nanostructured silver surfaces are reported. Unique in the present study, the flavin is not directly adsorbed at the Ag surface but is attached through a chemical reacti...

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Detalles Bibliográficos
Publicado:	2008
Materias:	Ag(111) surface Colloidal templates Cysteamine Direct contacts Electrochemical SERS Electrochemical surfaces In-situ Nano-structured Silver surface Surface enhancements
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v24_n13_p7018_Abdelsalam http://hdl.handle.net/20.500.12110/paper_07437463_v24_n13_p7018_Abdelsalam
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_07437463_v24_n13_p7018_Abdelsalam
record_format	dspace
spelling	paper:paper_07437463_v24_n13_p7018_Abdelsalam2023-06-08T15:44:54Z Quantitative electrochemical SERS of flavin at a structured silver surface Ag(111) surface Colloidal templates Cysteamine Direct contacts Electrochemical SERS Electrochemical surfaces In-situ Nano-structured Silver surface Surface enhancements In situ electrochemical surface enhanced Raman spectra (SERS) for an immobilized monolayer of a flavin analogue (isoalloxazine) at nanostructured silver surfaces are reported. Unique in the present study, the flavin is not directly adsorbed at the Ag surface but is attached through a chemical reaction between cysteamine adsorbed on the Ag surface and methylformylisoalloxazine. Even though the flavin is held away from direct contact with the metal, strong surface enhancements are observed. The nanostructured silver surfaces are produced by electrodeposition through colloidal templates to produce thin (< 1 μm) films containing close-packed hexagonal arrays of uniform 900 nm sphere segment voids. The sphere segment void (SSV) structured silver surfaces are shown to be ideally suited to in situ electrochemical SERS studies at 633 nm, giving stable, reproducible surface enhancements at a range of electrode potentials, and we show that the SER spectra are sensitive to subfemtomole quantities of immobilized flavin. Studies of the SER spectra as a function of the electrode potential show clear evidence for the formation of the flavin semiquinone at the electrode surface at cathodic potentials. © 2008 American Chemical Society. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v24_n13_p7018_Abdelsalam http://hdl.handle.net/20.500.12110/paper_07437463_v24_n13_p7018_Abdelsalam
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Ag(111) surface Colloidal templates Cysteamine Direct contacts Electrochemical SERS Electrochemical surfaces In-situ Nano-structured Silver surface Surface enhancements
spellingShingle	Ag(111) surface Colloidal templates Cysteamine Direct contacts Electrochemical SERS Electrochemical surfaces In-situ Nano-structured Silver surface Surface enhancements Quantitative electrochemical SERS of flavin at a structured silver surface
topic_facet	Ag(111) surface Colloidal templates Cysteamine Direct contacts Electrochemical SERS Electrochemical surfaces In-situ Nano-structured Silver surface Surface enhancements
description	In situ electrochemical surface enhanced Raman spectra (SERS) for an immobilized monolayer of a flavin analogue (isoalloxazine) at nanostructured silver surfaces are reported. Unique in the present study, the flavin is not directly adsorbed at the Ag surface but is attached through a chemical reaction between cysteamine adsorbed on the Ag surface and methylformylisoalloxazine. Even though the flavin is held away from direct contact with the metal, strong surface enhancements are observed. The nanostructured silver surfaces are produced by electrodeposition through colloidal templates to produce thin (< 1 μm) films containing close-packed hexagonal arrays of uniform 900 nm sphere segment voids. The sphere segment void (SSV) structured silver surfaces are shown to be ideally suited to in situ electrochemical SERS studies at 633 nm, giving stable, reproducible surface enhancements at a range of electrode potentials, and we show that the SER spectra are sensitive to subfemtomole quantities of immobilized flavin. Studies of the SER spectra as a function of the electrode potential show clear evidence for the formation of the flavin semiquinone at the electrode surface at cathodic potentials. © 2008 American Chemical Society.
title	Quantitative electrochemical SERS of flavin at a structured silver surface
title_short	Quantitative electrochemical SERS of flavin at a structured silver surface
title_full	Quantitative electrochemical SERS of flavin at a structured silver surface
title_fullStr	Quantitative electrochemical SERS of flavin at a structured silver surface
title_full_unstemmed	Quantitative electrochemical SERS of flavin at a structured silver surface
title_sort	quantitative electrochemical sers of flavin at a structured silver surface
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v24_n13_p7018_Abdelsalam http://hdl.handle.net/20.500.12110/paper_07437463_v24_n13_p7018_Abdelsalam
_version_	1768544279127392256

Quantitative electrochemical SERS of flavin at a structured silver surface

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