Inter-particle charge transfer in TiO-phytate films: Generator-collector gold-gold junction transients

L. Rassaei, M. Herrmann, S.N. Gordeev, F. Marken

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Self-assembled films of nanoparticulate TiO2-phytate are prepared on a gold disc–gold disc junction electrode with approximately 6 μm inter-electrode gap. Charge diffusion dominated by inter-particle hopping of electrons is investigated (in contrast to bulk charge transport) for films immersed in 0.1 M phosphate buffer solution at pH 7 using gold–gold generator–collector voltammetry and chronoamperometry techniques. Numerical simulation based on a basic “randomly propagating” finite difference approach is employed to reveal first approximation potential-dependent apparent diffusion coefficients and apparent concentrations for electrons (Dapp increases from 9 × 10−11 to 18 × 10−11 m2 s−1 and capp increases from 0.2 to 37 M when going from −0.8 to −1.2 V vs. SCE). A mechanistic model for inter-particle versus intra-particle electron hopping is developed. Applications of the inter-particle charge hopping process in electrochemical sensing are suggested.
Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume686
DOIs
Publication statusPublished - 15 Oct 2012

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