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Tunable electric field enhancement and redox chemistry on TiO2 Island films via covalent attachment to Ag or Au nanostructures

  • Ag-TiO2 and Au-TiO2 hybrid electrodes were designed by covalent attachment of TiO2 nanoparticles to Ag or Au electrodes via an organic linker. The optical and electronic properties of these systems were investigated using the cytochrome b(5) (Cyt b(5)) domain of sulfite oxidase, exclusively attached to the TiO2 surface, as a Raman marker and model redox enzyme. Very strong SERR signals of Cyt b(5) were obtained for Ag-supported systems due to plasmonic field enhancement of Ag. Time-resolved surface-enhanced resonance Raman spectroscopic measurements yielded a remarkably fast electron transfer kinetic (k = 60 s(-1)) of Cyt b(5) to Ag. A much lower Raman intensity was observed for Au-supported systems with undefined and slow redox behavior. We explain this phenomenon on the basis of the different potential of zero charge of the two metals that largely influence the electronic properties of the TiO2 island film.

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Author:Arumugam Sivanesan, Khoa H. Ly, Witold Adamkiewicz, Konstanze Stiba, Silke Leimkühler, Inez M. Weidinger
ISSN:1932-7447 (print)
Parent Title (English):The journal of physical chemistry : C, Nanomaterials and interfaces
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
First Page:11866
Last Page:11872
Funder:Fonds der Chemie; DFG (UniCat)
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie
Peer Review:Referiert