Enhanced signal-to-background ratios in voltammetric measurements made at diamond thin-film electrochemical interfaces

Jerzy W. Strojek, Michael C. Granger, Greg M. Swain, Tim Dallas, Mark W. Holtz

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

Large signal-to-background (S/B) ratios for the Fe(CN)63-/4- and IrCl62-/3- redox couples in KCl have been observed in cyclic voltammetric measurements made at a conductive diamond thin-film electrode without any conventional surface pretreatment The S/B ratios were a factor of ∼16 and 8 larger at diamond than at freshly polished glassy carbon (GC) for Fe(CN)63-/4- and IrCl62-/3-, respectively. The polycrystalline diamond film, grown on a p-Si(100) substrate, possessed significant cubic {100} faceting, as evidenced by AFM images, and was of high quality, as indicated by Raman spectroscopy. The high degree of electrochemical activity without surface pretreatment, the enhanced S/B ratios, and the excellent response stability demonstrate that diamond might be an attractive new electrode material for electroanalysis.

Original languageEnglish
Pages (from-to)2031-2037
Number of pages7
JournalAnalytical Chemistry
Volume68
Issue number13
DOIs
StatePublished - Jul 1 1996

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