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Reference type: Journal
Authors: Lee SW, Ichinose I, Kunitake T
Article Title: Molecular imprinting of azobenzene carboxylic acid on a TiO2 ultrathin film by the surface sol-gel process.
Publication date: 1998
Journal: Langmuir
Volume: 14
Issue: (10)
Page numbers: 2857-2863.
DOI: 10.1021/la9801763

Abstract: Ultrathin films of titanium oxide gel imprinted with 4-(4- propyloxyphenylazo)benzoic acid (C(3)AzoCO(2)H) were prepared by repeated immersion of a gold-coated quartz crystal microbalance (QCM) electrode or a quartz plate in solutions of C(3)AzoCO(2)H and titanium butoxide (Ti(O-nBu)(4)) in toluene/ethanol. Regular film growth was confirmed by frequency decrement in QCM measurements and by the appearance of the azobenzene absorption in UV-vis spectroscopy. The template molecule could be completely removed upon treatment with 1% aqueous ammonia, The resulting films showed saturation binding of the template molecule in acetonitrile in less than 1 min. Binding of the template molecule was greatest among aromatic carboxylic acids that are structurally related to the template. A related ester showed a significant reduction in the binding efficiency. The surface sol-gel process provides a powerful tool for molecular imprinting in ultrathin metal oxide films

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