INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
artículos
Título:
Quantitative Electrochemical SERS of Flavin at a Structured Silver Surface
Autor/es:
ABDELSALAM, M.; BARTLETT, P.N.; RUSSEL, A.E.; BAUMBERG, J.J.; CALVO, E.J.; TOGNALLI, N.; FAINSTEIN, A.
Revista:
LANGMUIR
Editorial:
American Chemical Society
Referencias:
Lugar: Pensylvania; Año: 2008 vol. 24 p. 7018 - 7923
ISSN:
0743-7463
Resumen:
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 ìm) 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.
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.
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.
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.
<1 ìm) 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.