INVESTIGADORES
PATRITO Eduardo Martin
artículos
Título:
Electrochemical study of adlayers of α,ω-alkanedithiols on Au(1 1 1): Influence of the forming solution, chain length and treatment with mild reducing agents
Autor/es:
F. P. COMETTO; C. A. CALDERÓN; E. M. EUTI; D. K. JACQUELÍN; M. A. PEREZ; E. M. PATRITO; V. A. MACAGNO
Revista:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY - (Print)
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Año: 2011 vol. 661 p. 90 - 99
ISSN:
1572-6657
Resumen:
Self-assembled adlayers of alkanedithiols (DTs) on Au(1 1 1) are studied with
electrochemical techniques (reductive desorption experiments, redox couples
cyclic voltamperometry and electrochemical impedance spectroscopy) in order to
characterize adlayer structures. The formation of intralayer and interlayer
disulphide bonds (S-S) strongly affects the structure of the layers. We
considered different variables which influence the amount of S-S bonds: the
length of the alkyl chain (from 2 to 9 C atoms), the polarity of the solvent of
the forming solution (ethanol, n-hexane and toluene), the O2 level
and the use of a post-deposition treatment with mild reducing agents. Optimal
experimental conditions for the formation of DT monolayers with controlled
amount of S-S bonds for both short and long alkyl chains are precisely
identified. According to our results, short chain DTs form multilayer structures
(interlayer S-S bonds) under typical procedures; whereas long chain DTs present
intralayer S-S bonds. The use of low polarity solvents during the layer
formation as well as the use of reducing agents after deposition favours the
formation of good quality DT monolayers. © 2011 Elsevier B.V. All rights
reserved.