Electrochemical properties of a gold electrode modified with a mixed monolayer

Ko Takehara, Yasushi Ide

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The electrochemical properties of a gold electrode modified with a mixed thiol monolayer containing both a polar and a non-polar head group have been investigated in aqueous Fe(CN)6 4-, flavin adenine dinucleotide (FAD) and ubiquinone-0 (2,3-dimethoxy-5-methyl-1,4-benzoquinone, UQ0) solutions. The cyclic voltammetric current-potential (i-E) response of Fe(CN)6 4- was found to be affected considerably by the polarity of the head group contained in the mixed monolayer assembly, as compared with those of FAD and UQ0. It was also found that in the cases of UQ0 and FAD the i-E responses for the modified electrode were affected by their own molecular size rather than the polarity of the mixed monolayer head group. Furthermore, compared with Fe(CN)6 4- ion, these biologically related molecules are able to permeate readily into the well-organized and hydrophobic alkyl chains of the monolayer assembly. The voltammetric profile of UQ0 was improved by the modification of aminoethanethiol, as compared with those of bare gold and the electrode modified with other polar thiols. Further, two different permeation paths of the electrode species into the mixed monolayer are suggested from the variation of the i-E response with the cycle of the potential scan.

Original languageEnglish
Pages (from-to)207-219
Number of pages13
JournalBioelectrochemistry and Bioenergetics
Volume27
Issue number2
DOIs
Publication statusPublished - 1992

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Electrochemical properties
Gold
Flavin-Adenine Dinucleotide
Monolayers
adenines
Electrodes
gold
electrodes
Sulfhydryl Compounds
thiols
polarity
assembly
quinones
Permeation
Ions
cycles
profiles
Molecules
molecules
ions

All Science Journal Classification (ASJC) codes

  • Biochemistry

Cite this

Electrochemical properties of a gold electrode modified with a mixed monolayer. / Takehara, Ko; Ide, Yasushi.

In: Bioelectrochemistry and Bioenergetics, Vol. 27, No. 2, 1992, p. 207-219.

Research output: Contribution to journalArticle

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