Elucidation of the electron transfer mechanism of marker ions at SAMs with charged head groups
DC Element | Wert | Sprache |
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dc.contributor.author | Degefa, TH | |
dc.contributor.author | Schon, P | |
dc.contributor.author | Bongard, D | |
dc.contributor.author | Walder, L | |
dc.date.accessioned | 2021-12-23T16:01:23Z | - |
dc.date.available | 2021-12-23T16:01:23Z | - |
dc.date.issued | 2004 | |
dc.identifier.issn | 15726657 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/4932 | - |
dc.description.abstract | Self assembled monolayers (SAMs) of 11-mercaptoundecanoic acid (MUA) and 11-amino-1-undecanethiol (AUT) were prepared on gold electrodes. The SAMs were investigated by differential pulse voltammetry (DPV), cyclic voltammetry (CV) and rotating disk voltammetry (RDV) using [Fe(CN)(6)](3-),[Fe(CN)(6)](4-) and Ru(NH3)(6)(3+) as electroactive marker ions, and La3+, Ca2+,1,3,7-naphthalene trisulfonate (NTS3-), N,N'-dihydroxyethyl-4,4'-bipyridinium (Vi(o++)), 1-ferrocenylethanol and ferrocenealdehyde as ion-gate promoters, surface site competing ions, and/or electrocatalysts. The current densities at the SAM-modified electrodes correlate with three types of simple interactions, i.e., charge-equal charge, charge-uncharged, and charge-opposite charge. More detailed investigations revealed: (i) strong counter ion binding of multiply charged electroactive or non-electroactive ions to the oppositely charged SAM head groups; (ii) competition between equally charged ions for such surface sites; (iii) electrocatalysis of electron transfer by surface confined electroactive marker ions to redox species in solution including quantitative electron transfer rates by analysis of Koutecky -Levich plots; (iv) apparent charge inversion of the SAM head groups by surface confinement of a multiply charged counter ion; (v) build-up of a second layer of multiply charged electroactive ions at the charge-inverted SAM; (vi) competing electron transfer through the inner and outer layer at the charge inverted SAM. This insight allows for a more detailed understanding of the principles of signal amplification in ion gate sensors. (C) 2004 Elsevier B.V. All rights reserved. | |
dc.language.iso | en | |
dc.publisher | ELSEVIER SCIENCE SA | |
dc.relation.ispartof | JOURNAL OF ELECTROANALYTICAL CHEMISTRY | |
dc.subject | ACID | |
dc.subject | CHANNEL SENSORS | |
dc.subject | Chemistry | |
dc.subject | Chemistry, Analytical | |
dc.subject | Electrochemistry | |
dc.subject | electron transfer catalysis | |
dc.subject | electrostatic interactions | |
dc.subject | FERRICYANIDE | |
dc.subject | GATE RESPONSE | |
dc.subject | GOLD ELECTRODES | |
dc.subject | ion-gate sensor | |
dc.subject | marker ion | |
dc.subject | RECEPTORS | |
dc.subject | RECOGNITION | |
dc.subject | ROTATING-DISK ELECTRODES | |
dc.subject | self assembled monolayer | |
dc.subject | SELF-ASSEMBLED MONOLAYERS | |
dc.subject | TRIVALENT CATIONS | |
dc.title | Elucidation of the electron transfer mechanism of marker ions at SAMs with charged head groups | |
dc.type | journal article | |
dc.identifier.doi | 10.1016/j.jelechem.2004.07.026 | |
dc.identifier.isi | ISI:000225310800007 | |
dc.description.volume | 574 | |
dc.description.issue | 1 | |
dc.description.startpage | 49 | |
dc.description.endpage | 62 | |
dc.contributor.researcherid | F-7330-2011 | |
dc.identifier.eissn | 18732569 | |
dc.publisher.place | PO BOX 564, 1001 LAUSANNE, SWITZERLAND | |
dcterms.isPartOf.abbreviation | J. Electroanal. Chem. | |
crisitem.author.dept | Institut für Chemie neuer Materialien | - |
crisitem.author.deptid | institute11 | - |
crisitem.author.orcid | 0000-0002-5497-034X | - |
crisitem.author.parentorg | FB 05 - Biologie/Chemie | - |
crisitem.author.grandparentorg | Universität Osnabrück | - |
crisitem.author.netid | WaLo966 | - |
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geprüft am 01.06.2024