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Quantitative electrochemical SERS of flavin at a structured silver surface

Quantitative electrochemical SERS of flavin at a structured silver surface
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 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 ?m) 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
0743-7463
7018-7023
Abdelsalam, Mamdouh E.
d1cbddcb-9f5c-46d5-b774-1bbaee26e115
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Baumberg, Jeremy J.
51423b5f-bdb8-4851-8d50-472253ceb12c
Calvo, Ernesto J.
1e3276b3-088d-4061-a2b7-6ab073c714d8
Tognalli, Nicolás G.
44d6db3a-610b-4db4-b1ff-904e5c882847
Fainstein, Alejandro
7c56b269-e3d9-4eaa-b5bc-fba75f7201ec
Abdelsalam, Mamdouh E.
d1cbddcb-9f5c-46d5-b774-1bbaee26e115
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Baumberg, Jeremy J.
51423b5f-bdb8-4851-8d50-472253ceb12c
Calvo, Ernesto J.
1e3276b3-088d-4061-a2b7-6ab073c714d8
Tognalli, Nicolás G.
44d6db3a-610b-4db4-b1ff-904e5c882847
Fainstein, Alejandro
7c56b269-e3d9-4eaa-b5bc-fba75f7201ec

Abdelsalam, Mamdouh E., Bartlett, Philip N., Russell, Andrea E., Baumberg, Jeremy J., Calvo, Ernesto J., Tognalli, Nicolás G. and Fainstein, Alejandro (2008) Quantitative electrochemical SERS of flavin at a structured silver surface. Langmuir, 24 (13), 7018-7023. (doi:10.1021/la800410x).

Record type: Article

Abstract

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 ?m) 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

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More information

Published date: 2008
Organisations: Chemistry, Physics & Astronomy

Identifiers

Local EPrints ID: 145043
URI: https://eprints.soton.ac.uk/id/eprint/145043
ISSN: 0743-7463
PURE UUID: b1b7e461-e435-4b2e-b8c0-edb20e019db9
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

Catalogue record

Date deposited: 15 Apr 2010 14:41
Last modified: 29 Oct 2019 02:07

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