Ferrocene-modified amorphous carbon electrodes have been prepared via an in situ Grignard reaction with chlorine-terminated amorphous carbon films. Cyclic voltammograms of the ferrocene-modified carbon electrodes (Fc-(CH2)n-aC) show that surface coverages of up to 1.2 x 10-9 mol/cm2 can be obtained. Plots of peak current vs. scan rate are anticipated to be linear for a surface-bound species, but data for the Fc-(CH2)n-aC electrodes exhibit distinct curvature. The extent of curvature varies as a function of surface coverage and alkyl chain length, indicating non-uniform lateral interactions. Moreover, when conformational flexibility is minimized, direct and quantifiable evidence for a non-uniform surface distribution is revealed. Consequences of these disordered distribution of surface-anchored ferrocenes with detectable lateral interactions are observed in the heterogeneous electron transfer kinetics of Fc-(CH2)n-aC, providing an additional means of quantifying the disorder. Together, these data demonstrate that disorder of these ferrocene-modified amorphous carbon electrodes arising from non-random surface distribution of electroactive ferrocene species can be directly quantified through electroanalytical methods.

Quantifying effects of disorder on ferrocene-modified amorphous carbon electrodes

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.