Abstract

Highly boron-doped diamond electrodes are characterized voltammetrically employing Ru(NH3)63+/2+, Fe(CN)63-/4-, benzoquinone/hydroquinone and cytochrome c redox systems. The diamond electrodes, which are polished to nanometer finish, are initially 'activated' electrochemically and then pretreated by oxidation, reduction, or polishing. All electrodes give reversible cyclic voltammetric responses for the reduction of Ru(NH3)63+ in aqueous solution. Redox systems other than Ru(NH3)63+/2+ show characteristic electrochemical behavior as a function of diamond surface pretreatment. In particular, the horse heart cytochrome c redox system is shown to give reversible voltammetric responses at Al2O3 polished boron-doped diamond electrodes. No voltammetric response for cytochrome c is detected at anodically pretreated diamond electrodes. The observations are attributed to preferential interaction of the polished diamond surface with the reactive region of the cytochrome c molecule and low interference due to a lack of protein electrode fouling.

Original languageEnglish
Pages (from-to)62-66
Number of pages5
JournalElectrochemistry Communications
Volume4
Issue number1
DOIs
Publication statusPublished - 11 Feb 2002

Keywords

  • Bioelectrochemistry
  • Boron-doped-diamond
  • Cytochrome c
  • Protein adsorption
  • Voltammetry

ASJC Scopus subject areas

  • Electrochemistry

Fingerprint Dive into the research topics of 'Direct cytochrome c electrochemistry at boron-doped diamond electrodes'. Together they form a unique fingerprint.

Cite this