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Catalytic Nanotruss Structures Realized by Magnetic Self-Assembly in Pulsed Plasma
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-6602-7981
Umeå Univ, Sweden.
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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 mu m thick nanotruss structure was grown on a lightweight, flexible and conducting carbon-paper substrate, which enabled the efficient production of H-2 gas from water splitting at a low overpotential of 210 mV and at a current density of 10 mA/cm(2).

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
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-148107DOI: 10.1021/acs.nanolett.8b00718ISI: 000432093200055PubMedID: 29624405OAI: oai:DiVA.org:liu-148107DiVA, id: diva2:1211310
Funder
Knut and Alice Wallenberg Foundation, KAW 14.0276Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2019-09-06
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Ekeroth, SebastianMünger, PeterBoyd, RobertBrenning, NilsHelmersson, Ulf

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