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Catalytic nanotruss structures realized by magnetic self-assembly in pulsed plasma
Umeå University, Faculty of Science and Technology, Department of Physics.
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2018 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 18, no 5, p. 3132-3137Article in journal (Refereed) Published
Abstract [en]

Tunable nanostructures that feature a high surface area are firmly attached to a conducting substrate and can be fabricated efficiently over significant areas, which are of interest for a wide variety of applications in, for instance, energy storage and catalysis. We present a novel approach to fabricate Fe nanoparticles using a pulsed-plasma process and their subsequent guidance and self-organization into well-defined nanostructures on a substrate of choice by the use of an external magnetic field. A systematic analysis and study of the growth procedure demonstrate that nondesired nanoparticle agglomeration in the plasma phase is hindered by electrostatic repulsion, that a polydisperse nanoparticle distribution is a consequence of the magnetic collection, and that the formation of highly networked nanotruss structures is a direct result of the polydisperse nanoparticle distribution. The nanoparticles in the nanotruss are strongly connected, and their outer surfaces are covered with a 2 nm layer of iron oxide. A 10 μm thick nanotruss structure was grown on a lightweight, flexible and conducting carbon-paper substrate, which enabled the efficient production of H2 gas from water splitting at a low overpotential of 210 mV and at a current density of 10 mA/cm2.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 18, no 5, p. 3132-3137
Keywords [en]
nanotrusses, nanowires, nanoparticles, iron, electrocatalysis, pulsed sputtering
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:umu:diva-148834DOI: 10.1021/acs.nanolett.8b00718ISI: 000432093200055PubMedID: 29624405OAI: oai:DiVA.org:umu-148834DiVA, id: diva2:1217056
Available from: 2018-06-12 Created: 2018-06-12 Last updated: 2018-06-12Bibliographically approved

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Ekspong, JoakimWågberg, ThomasEdman, Ludvig

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