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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

New contribution in the study of phase formation in mixed alkanethiol self-assembled monolayers: a powerful tool for transducers design

Full text
Author(s):
Coelho, Dyovani [1] ; Machado, Sergio A. S. [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Electrochimica Acta; v. 142, p. 191-201, OCT 1 2014.
Web of Science Citations: 6
Abstract

Here, the formation of distinct 3-mercaptopropionic acid (MPA) and 11-mercaptoundecanoic acid (MUA) domains on polycrystalline gold surfaces was investigated by cyclic voltammetry and electrochemical quartz crystal nanobalance. Voltammetric experiments with the {[}Fe(CN)(6)](4-/3-) redox couple showed that the MPA SAM allowed electron transference at the same rate as the bare gold surface, while the MUA SAM blocked the entire electrode surface. The chemical nature of mixed SAMs is discussed by evaluating the mass variations and the respective molecular weight in the desorption potential regions for each thiol by electrochemical quartz crystal nanobalance. Different domains containing MUA, MPA and their mixtures were identified in the massograms, thus demonstrating MPA island domains and the electrochemical response obtained for the {[}Fe(CN)(6)](4-/3-) redox couple. The modified surfaces, as well as bare Au electrode, were used for electroanalysis of the flavonoid fisetin in Britton-Robinson buffer solution, pH 5. Depending on the modification, detection limits as low as 3.35 x10(-10) mol L-1, which attests the possibility of use such surfaces in electroanalysis. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 10/03813-4 - Development and characterization of bi-functional and nanoestructured Au-Pt surfaces and its application in biosensors for pesticides
Grantee:Sergio Antonio Spinola Machado
Support type: Regular Research Grants
FAPESP's process: 11/07022-4 - Use of underpotential deposition in the dopping of electrodeposited selenium semiconductive films.
Grantee:Dyovani Coelho
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/17053-0 - Development of an electroanalytical methodology for selective doping of electrodeposited selenium semiconducting films based in the underpotential deposition
Grantee:Sergio Antonio Spinola Machado
Support type: Regular Research Grants