Electrochemistry of Redox-Active Guest Molecules at β-Cyclodextrin-Functionalized Silicon Electrodes

Janneke Veerbeek, Alejandro Méndez-Ardoy, Jurriaan Huskens*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
58 Downloads (Pure)

Abstract

Functionalization of silicon-based sensing devices with self-assembled receptor monolayers offers flexibility and specificity towards the requested analyte as well as the possibility of sensor reuse. As electrical sensor performance is determined by electron transfer, we functionalized H-terminated silicon substrates with β-cyclodextrin (β-CD) molecules to investigate the electronic coupling between these host monolayers and the substrate. A trivalent (one ferrocene and two adamantyl moieties), redox-active guest was bound to the β-CD surface with a coverage of about 10−11 mol/cm2 and an overall binding constant of 1.5⋅109 M−1. This packing density of the host monolayers on silicon is lower than that for similar β-CD monolayers on gold. The monolayers were comparable on low-doped p-type and highly doped p++ substrates regarding their packing density and the extent of oxide formation. Nonetheless, the electron transfer was more favorable on p++ substrates, as shown by the lower values of the peak splitting and peak widths in the cyclic voltammograms. These results show that the electron-transfer rate on the host monolayers is not only determined by the composition of the monolayer, but also by the doping level of the substrate.

Original languageEnglish
Pages (from-to)1470-1477
Number of pages8
JournalChemElectroChem
Volume4
Issue number6
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • electron transfer
  • hydrosilylation
  • self-assembled monolayers
  • supramolecular chemistry
  • surface chemistry

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