Quartz crystal microbalance monitoring of density changes in mesoporous TiO2 phytate films during redox and ion exchange processes

被引:6
作者
McKenzie, KJ
Marken, F [1 ]
Gao, X
Tsang, SC
Tam, KY
机构
[1] Univ Loughborough, Dept Chem, Loughborough LE11 3TU, Leics, England
[2] Univ Reading, Dept Chem, Reading RG6 6AD, Berks, England
[3] AstraZeneca, Macclesfield SK10 4TG, Cheshire, England
关键词
quartz crystal microbalance; TiO2; nanoparticles; phytic acid; directed assembly; voltammetry; density response; adsorption; bioinorganic composite materials;
D O I
10.1016/S1388-2481(03)00045-6
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Nanofilm deposits of TiO2 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 TiO2 sol and (ii) an aqueous phytic acid solution (pH 3) results in layer-by-layer formation of a mesoporous film. Ru(NH3)(6)(3+) 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(NH3)(6)(3+) complex to be reduced to Ru(NH3)(6)(2+) 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. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:286 / 291
页数:6
相关论文
共 19 条
[1]   Quartz-crystal microbalance and cyclic voltammetric studies of the adsorption behaviour of serum albumin on self-assembled thiol monolayers possessing different hydrophobicity and polarity [J].
Anzai, J ;
Guo, B ;
Osa, T .
BIOELECTROCHEMISTRY AND BIOENERGETICS, 1996, 40 (01) :35-40
[2]   Viscoelastic characterization of electroactive polymer films at the electrode/solution interface [J].
Bandey, HL ;
Hillman, AR ;
Brown, MJ ;
Martin, SJ .
FARADAY DISCUSSIONS, 1997, 107 :105-121
[3]   Acoustic waves and the study of biochemical macromolecules and cells at the sensor-liquid interface [J].
Cavic, BA ;
Hayward, GL ;
Thompson, M .
ANALYST, 1999, 124 (10) :1405-1420
[4]   Adsorptions of plasma proteins and their elutabilities from a polysiloxane surface studied by an on-line acoustic wave sensor [J].
Cavic, BA ;
Thompson, M .
ANALYTICAL CHEMISTRY, 2000, 72 (07) :1523-1531
[5]   Influence of roughness on the admittance of the quartz crystal microbalance immersed in liquids [J].
Daikhin, L ;
Gileadi, E ;
Katz, G ;
Tsionsky, V ;
Urbakh, M ;
Zagidulin, D .
ANALYTICAL CHEMISTRY, 2002, 74 (03) :554-561
[6]   Mechanistic and structural features of protein adsorption onto mesoporous silicates [J].
Deere, J ;
Magner, E ;
Wall, JG ;
Hodnett, BK .
JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (29) :7340-7347
[7]   Applications of functionalized transition metal complexes in photonic and optoelectronic devices [J].
Kalyanasundaram, K ;
Grätzel, M .
COORDINATION CHEMISTRY REVIEWS, 1998, 177 :347-414
[8]  
MARKEN F, 2003, IND J CHEM A, V42
[9]   Nanoporous iron oxide membranes: layer-by-layer deposition and electrochemical characterisation of processes within nanopores [J].
McKenzie, KJ ;
Marken, F ;
Hyde, M ;
Compton, RG .
NEW JOURNAL OF CHEMISTRY, 2002, 26 (05) :625-629
[10]  
MCKENZIE KJ, 2003, IN PRESS LANGMUIR, V19