pH-Switchable Redox Reactions and Bioelectrocatalytic Processes Using Au Nanoparticles-Modified Electrodes

Alexander Trifonov, Omer Yehezkeli, Ran Tel-Vered, Itamar Willner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Boronate ester complexes generated between methylene blue (MB+)-functionalized Au nanoparticles (NPs) and electrode surfaces are implemented to stimulate the bioelectrocatalyzed reduction of H2O2 in the presence of horseradish peroxidase (HRP). Two kinds of Au NPs are prepared: Class I includes MB+/phenylboronic acid as a modifying layer, whereas Class II includes MB+/dithiothreitol as a mixed capping layer. The Class I or II NPs form boronate ester complexes with a dithiothreitol- or phenylboronic acid-functionalized Au electrodes, respectively. By the cyclic loading of the NPs on the electrodes (pH8.1), and the removal of the NPs (pH1.5), switchable bioelectrocatalyzed reduction of H2O2 is demonstrated.

Original languageEnglish
Pages (from-to)1605-1612
Number of pages8
JournalElectroanalysis
Volume25
Issue number7
DOIs
StatePublished - Jul 2013

Keywords

  • Bioelectrocatalysis
  • Electrode
  • Nanoparticle
  • PH
  • Switch

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