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

Sivanesan A, Ly KH, Adamkiewicz W, Stiba K, Leimkuehler S, Weidinger IM (2013)

Publication Type: Journal article

Publication year: 2013

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 117

Pages Range: 11866-11872

Journal Issue: 22

DOI: 10.1021/jp4032578

Abstract

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 b5 (Cyt b5) 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 b5 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. © 2013 American Chemical Society.

Involved external institutions

Technische Universität Berlin DE Germany (DE) Polska Akademia Nauk (PAN) / Polish Academy of Sciences PL Poland (PL) Universität Potsdam DE Germany (DE)

How to cite

APA:

Sivanesan, A., Ly, K.H., Adamkiewicz, W., Stiba, K., Leimkuehler, S., & Weidinger, I.M. (2013). Tunable electric field enhancement and redox chemistry on TiO2 island films via covalent attachment to Ag or Au nanostructures. Journal of Physical Chemistry C, 117(22), 11866-11872. https://doi.org/10.1021/jp4032578

MLA:

Sivanesan, Arumugam, et al. "Tunable electric field enhancement and redox chemistry on TiO2 island films via covalent attachment to Ag or Au nanostructures." Journal of Physical Chemistry C 117.22 (2013): 11866-11872.

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