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Quartz crystal microbalance monitoring of density changes in mesoporous TiO2 phytate films during redox and ion exchange processes
McKenzie K.J.3; Marken F.3; Gao X.2; Tsang S.C.2; Tam K.Y.1
2003-04-01
Source PublicationElectrochemistry Communications
ISSN13882481
Volume5Issue:4Pages:286-291
Abstract

Nanofilm deposits of TiO nanoparticle phytates are formed on gold electrode surfaces by 'directed assembly' methods. Alternate exposure of a 3-mercapto-propionic acid modified gold surface to (i) a TiO sol and (ii) an aqueous phytic acid solution (pH 3) results in layer-by-layer formation of a mesoporous film. Ru(NH is shown to strongly adsorb/accumulate into the mesoporous structure whilst remaining electrochemically active. Scanning the electrode potential into a sufficiently negative potential range allows the Ru(NH) complex to be reduced to Ru(NH) which undergoes immediate desorption. When applied to a gold coated quartz crystal microbalance (QCM) sensor, electrochemically driven adsorption and desorption processes in the mesoporous structure become directly detectable as a frequency response, which corresponds directly to a mass or density change in the membrane. The frequency response (at least for thin films) is proportional to the thickness of the mass-responsive film, which suggests good mechanical coupling between electrode and film. Based on this observation, a method for the amplified QCM detection of small mass/density changes is proposed by conducting measurements in rigid mesoporous structures. © 2003 Elsevier Science B.V. All rights reserved.

KeywordAdsorption Bioinorganic Composite Materials Density Response Directed Assembly Nanoparticles Phytic Acid Quartz Crystal Microbalance Tio2 Voltammetry
DOI10.1016/S1388-2481(03)00045-6
URLView the original
Indexed BySCI
Language英语
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000182556600002
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Cited Times [WOS]:6   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Health Sciences
Affiliation1.AstraZeneca
2.University of Reading
3.Loughborough University
Recommended Citation
GB/T 7714
McKenzie K.J.,Marken F.,Gao X.,et al. Quartz crystal microbalance monitoring of density changes in mesoporous TiO2 phytate films during redox and ion exchange processes[J]. Electrochemistry Communications,2003,5(4):286-291.
APA McKenzie K.J.,Marken F.,Gao X.,Tsang S.C.,&Tam K.Y..(2003).Quartz crystal microbalance monitoring of density changes in mesoporous TiO2 phytate films during redox and ion exchange processes.Electrochemistry Communications,5(4),286-291.
MLA McKenzie K.J.,et al."Quartz crystal microbalance monitoring of density changes in mesoporous TiO2 phytate films during redox and ion exchange processes".Electrochemistry Communications 5.4(2003):286-291.
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