TY  - JOUR
A1  - Frasca, Stefano
A1  - Milan, Anabel Molero
A1  - Guiet, Amandine
A1  - Goebel, Caren
A1  - Perez-Caballero, Fernando
A1  - Stiba, Konstanze
A1  - Leimkühler, Silke
A1  - Fischer, Anna
A1  - Wollenberger, Ursula
T1  - Bioelectrocatalysis at mesoporous antimony doped tin oxide
 electrodes-Electrochemical characterization and direct enzyme
 communication
JF  - ELECTROCHIMICA ACTA
N2  - 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.
KW  - Antimony doped tin dioxide
KW  - Sulfite oxidase
KW  - Direct electrochemistry
KW  - Biosensor
KW  - Bioelectrocatalysis
Y1  - 2013
U6  - https://doi.org/10.1016/j.electacta.2013.03.144
SN  - 0013-4686
SN  - 1873-3859
VL  - 110
IS  - 2
SP  - 172
EP  - 180
PB  - PERGAMON-ELSEVIER SCIENCE LTD
CY  - OXFORD
ER  - 
TY  - JOUR
A1  - Guiet, Amandine
A1  - Goebel, Caren
A1  - Klingan, Katharina
A1  - Lublow, Michael
A1  - Reier, Tobias
A1  - Vainio, Ulla
A1  - Kraehnert, Ralph
A1  - Schlaad, Helmut
A1  - Strasser, Peter
A1  - Zaharieva, Ivelina
A1  - Dau, Holger
A1  - Driess, Matthias
A1  - Polte, Joerg
A1  - Fischer, Anna
T1  - Hydrophobic Nanoreactor Soft-Templating: A Supramolecular Approach to Yolk@Shell Materials
JF  - Advanced functional materials
N2  - Due to their unique morphology-related properties, yolk@shell materials are promising materials for catalysis, drug delivery, energy conversion, and storage. Despite their proven potential, large-scale applications are however limited due to demanding synthesis protocols. Overcoming these limitations, a simple soft-templated approach for the one-pot synthesis of yolk@shell nanocomposites and in particular of multicore metal nanoparticle@metal oxide nanostructures (M-NP@MOx) is introduced. The approach here, as demonstrated for Au-NP@ITOTR (ITOTR standing for tin-rich ITO), relies on polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) inverse micelles as two compartment nanoreactor templates. While the hydrophilic P4VP core incorporates the hydrophilic metal precursor, the hydrophobic PS corona takes up the hydrophobic metal oxide precursor. As a result, interfacial reactions between the precursors can take place, leading to the formation of yolk@shell structures in solution. Once calcined these micelles yield Au-NP@ITOTR nanostructures, composed of multiple 6 nm sized Au NPs strongly anchored onto the inner surface of porous 35 nm sized ITOTR hollow spheres. Although of multicore nature, only limited sintering of the metal nanoparticles is observed at high temperatures (700 degrees C). In addition, the as-synthesized yolk@shell structures exhibit high and stable activity toward CO electrooxidation, thus demonstrating the applicability of our approach for the design of functional yolk@shell nanocatalysts.
KW  - inverse micelles
KW  - nanoreactor
KW  - polystyrene-block-poly(4-vinylpyridine)
KW  - soft-templating
KW  - tin-rich ITO
KW  - yolk@shell materials
Y1  - 2015
U6  - https://doi.org/10.1002/adfm.201502388
SN  - 1616-301X
SN  - 1616-3028
VL  - 25
IS  - 39
SP  - 6228
EP  - 6240
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Guiet, Amandine
A1  - Unmüssig, Tobias
A1  - Göbel, Caren
A1  - Vainio, Ulla
A1  - Wollgarten, Markus
A1  - Driess, Matthias
A1  - Schlaad, Helmut
A1  - Polte, Jörg
A1  - Fischer, Anna
T1  - Yolk@Shell Nanoarchitectures with Bimetallic Nanocores - Synthesis and Electrocatalytic Applications
JF  - Earth & planetary science letters
KW  - AgAu alloy nanoparticles
KW  - tin-rich ITO
KW  - yolk@shell materials
KW  - nanoreactor
KW  - soft-templating
KW  - inverse micelles
KW  - polystyrene-block-poly(4-vinylpyridine)
Y1  - 2016
U6  - https://doi.org/10.1021/acsami.6b06595
SN  - 1944-8244
VL  - 8
SP  - 28019
EP  - 28029
PB  - American Chemical Society
CY  - Washington
ER  -