@article{SivanesanLyAdamkiewiczetal.2013,
  author    = {Sivanesan, Arumugam and Ly, Khoa H. and Adamkiewicz, Witold and Stiba, Konstanze and Leimk{\"u}hler, Silke and Weidinger, Inez M.},
  title     = {Tunable electric field enhancement and redox chemistry on TiO2 Island films via covalent attachment to Ag or Au nanostructures},
  series = {The journal of physical chemistry : C, Nanomaterials and interfaces},
  volume    = {117},
  journal   = {The journal of physical chemistry : C, Nanomaterials and interfaces},
  number    = {22},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1932-7447},
  doi       = {10.1021/jp4032578},
  pages     = {11866 -- 11872},
  year      = {2013},
  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 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.},
  language  = {en}
}
@article{FrascaMilanGuietetal.2013,
  author    = {Frasca, Stefano and Milan, Anabel Molero and Guiet, Amandine and Goebel, Caren and Perez-Caballero, Fernando and Stiba, Konstanze and Leimk{\"u}hler, Silke and Fischer, Anna and Wollenberger, Ursula},
  title     = {Bioelectrocatalysis at mesoporous antimony doped tin oxide electrodes-Electrochemical characterization and direct enzyme communication},
  series = {ELECTROCHIMICA ACTA},
  volume    = {110},
  journal   = {ELECTROCHIMICA ACTA},
  number    = {2},
  publisher = {PERGAMON-ELSEVIER SCIENCE LTD},
  address   = {OXFORD},
  issn      = {0013-4686},
  doi       = {10.1016/j.electacta.2013.03.144},
  pages     = {172 -- 180},
  year      = {2013},
  abstract  = {In this paper we report immobilization and bioelectrocatalysis of human sulfite oxidase (hSO) on nanostructured antimony doped tin oxide (ATO) thin film electrodes. Two types of ATO thin film electrodes were prepared via evaporation induced self-assembly of ATO nanoparticle sols. The use of a porogen results in different porosity and film thickness. Nevertheless both electrode types reveal similar quasi reversible electrochemical behavior for positive and negatively charged small mediators. Facile and durable immobilization of catalytically active enzyme in a direct electron transfer configuration was achieved without further chemical modification of the ATO surfaces. Interestingly, the binding of hSO onto the ATO surface seems to be not only of electrostatic nature, but also originates from a strong interaction between the histidine-tag of the enzyme and the supporting material. This is suggested from stable sulfite dependent bioelectrocatalytic signals at high ionic strength and imidazole desorption experiments. As such, ATO appears as a promising conductive platform for the immobilization of complex enzymes and their application in bioelectrocatalysis. (C) 2013 Elsevier Ltd. All rights reserved.},
  language  = {en}
}