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

Fingerprint

Phytic Acid
Gold
Charge transfer
Electrons
Chronoamperometry
Electrodes
Voltammetry
Buffers
Phosphates
Computer simulation

Cite this

Inter-particle charge transfer in TiO-phytate films : Generator-collector gold-gold junction transients. / Rassaei, L.; Herrmann, M.; Gordeev, S.N.; Marken, F.

In: Journal of Electroanalytical Chemistry, Vol. 686, 15.10.2012, p. 32-37.

Research output: Contribution to journalArticle

@article{a8fb0505f5d14df2b240e304c5e6d14e,
title = "Inter-particle charge transfer in TiO-phytate films: Generator-collector gold-gold junction transients",
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.",
author = "L. Rassaei and M. Herrmann and S.N. Gordeev and F. Marken",
year = "2012",
month = "10",
day = "15",
doi = "10.1016/j.jelechem.2012.09.022",
language = "English",
volume = "686",
pages = "32--37",
journal = "Journal of Electroanalytical Chemistry",
issn = "1572-6657",
publisher = "Elsevier",

}

TY - JOUR

T1 - Inter-particle charge transfer in TiO-phytate films

T2 - Generator-collector gold-gold junction transients

AU - Rassaei, L.

AU - Herrmann, M.

AU - Gordeev, S.N.

AU - Marken, F.

PY - 2012/10/15

Y1 - 2012/10/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84869431470&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1016/j.jelechem.2012.09.022

U2 - 10.1016/j.jelechem.2012.09.022

DO - 10.1016/j.jelechem.2012.09.022

M3 - Article

VL - 686

SP - 32

EP - 37

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 1572-6657

ER -