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Free-Standing Networks of Core-Shell Metal and Metal Oxide Nanotubes for Glucose Sensing

Muench, Falk and Sun, L. and Kottakkat, Tintula and Antoni, Markus and Schaefer, Sandra and Kunz, Ulrike and Molina-Luna, Leopoldo and Duerrschnabel, Michael and Kleebe, Hans-Joachim and Ayata, S. and Roth, C. and Ensinger, Wolfgang (2017):
Free-Standing Networks of Core-Shell Metal and Metal Oxide Nanotubes for Glucose Sensing.
12, In: ACS Applied Materials & Interfaces, (9(11)), ACS Publications, pp. 771-781, ISSN 1944-8244, DOI: 10.1021/acsami.6b13979,
[Article]

Abstract

Nanotube assemblies represent an emerging class of advanced functional materials, whose utility is however hampered by intricate production processes. In this work, three classes of nanotube networks (monometallic, bimetallic, and metal oxide) are synthesized solely using facile redox reactions and commercially available ion track membranes. First, the disordered pores of an ion track membrane are widened by chemical etching, resulting in the formation of a strongly interconnected pore network. Replicating this template structure with electroless copper plating yields a monolithic film composed of crossing metal nanotubes. We show that the parent material can be easily transformed into bimetallic or oxidic derivatives by applying a second electroless plating or thermal oxidation step. These treatments retain the monolithic network structure but result in the formation of core–shell nanotubes of altered composition (thermal oxidation: Cu2O-CuO; electroless nickel coating: Cu–Ni). The obtained nanomaterials are applied in the enzyme-free electrochemical detection of glucose, showing very high sensitivities between 2.27 and 2.83 A M–1 cm–2. Depending on the material composition, varying reactivities were observed: While copper oxidation reduces the response to glucose, it is increased in the case of nickel modification, albeit at the cost of decreased selectivity. The performance of the materials is explained by the network architecture, which combines the advantages of one-dimensional nano-objects (continuous conduction pathways, high surface area) with those of a self-supporting, open-porous superstructure (binder-free catalyst layer, efficient diffusion). In summary, this novel synthetic approach provides a fast, scalable, a

Item Type: Article
Erschienen: 2017
Creators: Muench, Falk and Sun, L. and Kottakkat, Tintula and Antoni, Markus and Schaefer, Sandra and Kunz, Ulrike and Molina-Luna, Leopoldo and Duerrschnabel, Michael and Kleebe, Hans-Joachim and Ayata, S. and Roth, C. and Ensinger, Wolfgang
Title: Free-Standing Networks of Core-Shell Metal and Metal Oxide Nanotubes for Glucose Sensing
Language: English
Abstract:

Nanotube assemblies represent an emerging class of advanced functional materials, whose utility is however hampered by intricate production processes. In this work, three classes of nanotube networks (monometallic, bimetallic, and metal oxide) are synthesized solely using facile redox reactions and commercially available ion track membranes. First, the disordered pores of an ion track membrane are widened by chemical etching, resulting in the formation of a strongly interconnected pore network. Replicating this template structure with electroless copper plating yields a monolithic film composed of crossing metal nanotubes. We show that the parent material can be easily transformed into bimetallic or oxidic derivatives by applying a second electroless plating or thermal oxidation step. These treatments retain the monolithic network structure but result in the formation of core–shell nanotubes of altered composition (thermal oxidation: Cu2O-CuO; electroless nickel coating: Cu–Ni). The obtained nanomaterials are applied in the enzyme-free electrochemical detection of glucose, showing very high sensitivities between 2.27 and 2.83 A M–1 cm–2. Depending on the material composition, varying reactivities were observed: While copper oxidation reduces the response to glucose, it is increased in the case of nickel modification, albeit at the cost of decreased selectivity. The performance of the materials is explained by the network architecture, which combines the advantages of one-dimensional nano-objects (continuous conduction pathways, high surface area) with those of a self-supporting, open-porous superstructure (binder-free catalyst layer, efficient diffusion). In summary, this novel synthetic approach provides a fast, scalable, a

Journal or Publication Title: ACS Applied Materials & Interfaces
Volume: 12
Number: 9(11)
Publisher: ACS Publications
Uncontrolled Keywords: core−shell nanostructures, electroless plating, enzyme-free glucose sensing, ion-track technology, Kirkendall effect, metal nanotubes
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 10 Dec 2018 09:25
DOI: 10.1021/acsami.6b13979
Funders: M.D. and L.M. acknowledge financial support from the Hessen State Ministry of Higher Education, Research and the Arts via LOEWE RESPONSE., The transmission electron microscope used in this work was partially funded by the German Research Foundation (DFG/INST163/2951).
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