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Impact of nanoparticle magnetization on the 3D formation of dual-phase Ni/NiO nanoparticle-based nanotrusses
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.
Department of Intelligent Mechanical Systems, Tokyo Metropolitan University, Tokyo, Japan.
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-6602-7981
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896X, Vol. 21, no 11, article id 21:228Article in journal (Refereed) Published
Abstract [en]

Magnetic nanoparticles with average size 30 nm were utilized to build three-dimensional framework structures—nanotrusses. In dual-phase Ni/NiO nanoparticles, there is a strong correlation between the amount of magnetic Ni and the final size and shape of the nanotruss. As it decreases, the length of the individual nanowires within the trusses also decreases, caused by a higher degree of branching of the wires. The position and orientation of the non-magnetic material within the truss structure was also investigated for the different phase compositions. For lower concentrations of NiO phase, the electrically conducting Ni-wire framework is maintained through the preferential bonding between the Ni crystals. For larger concentrations of NiO phase, the Ni-wire framework is interrupted by the NiO. The ability to use nanoparticles that are only partly oxidized in the growth of nanotruss structures is of great importance. It opens the possibility for using not only magnetic metals such as pure Ni, Fe, and Co, but also to use dual-phase nanoparticles that can strongly increase the efficiency of e.g. catalytic electrodes and fuel cells.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2019. Vol. 21, no 11, article id 21:228
Keywords [en]
Ni, NiO, Nanotruss, Nanoparticle, Magnetic assembly
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-161747DOI: 10.1007/s11051-019-4661-8ISI: 000494039300001OAI: oai:DiVA.org:liu-161747DiVA, id: diva2:1368853
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Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-19Bibliographically approved
In thesis
1. Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles
Open this publication in new window or tab >>Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nanomaterials are important tools for enabling technological progress as they can provide dramatically different properties as compared to the bulk counterparts. The field of nanoparticles is one of the most investigated within nanomaterials, thanks to the existing, relatively simple, means of manufacturing. In this thesis, high-power pulsed hollow cathode sputtering is used to nucleate and grow magnetic nanoparticles in a plasma. This sputtering technique provides a high degree of ionization of the sputtered material, which has previously been shown to aid in the growth of the nanoparticles. The magnetic properties of the particles are utilized and makes it possible for the grown particles to act as building blocks for self-assembly into more sophisticated nano structures, particularly when an external magnetic field is applied. These structures created are termed “nanowires” or “nanotrusses”, depending on the level of branching and inter-linking that occurs.

Several different elements have been investigated in this thesis. In a novel approach, it is shown how nanoparticles with more advanced structures, and containing material from two hollow cathodes, can be fabricated using high-power pulses. The dual-element particles are achieved by using two distinct and individual elemental cathodes, and a pulse process that allows tuning of individual pulses separately to them. Nanoparticles grown and investigated are Fe, Ni, Pt, Fe-Ni and Ni-Pt. Alternatively, the addition of oxygen to the process allows the formation of oxide or hybrid metal oxide – metal particles. For all nanoparticles containing several elements, it is demonstrated that the stoichiometry can be easily varied, either by the amount of reactive gas let into the process or by tuning the amount of sputtered material through adjusting the electric power supplied to the different cathodes.

One aim of the presented work is to find a suitable material for the use as a catalyst in the production of H2 gas through the process of water splitting. H2 is a good candidate to replace fossil fuels as an energy carrier. However, rare elements (such as Ir or Pt) needs to be used as the catalyst, otherwise a high overpotential is required for the splitting to occur, leading to a low efficiency. This work demonstrates a possible route to avoid this, by using nanomaterials to increase the surface-to-volume ratio, as well as optimizing the elemental ratio between different materials to lower the amount of noble elements required. 

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2019. p. 58
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2007
Keywords
Plasma, Synthesis, Self-Assembly, Magnetic, Nanoparticles
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:liu:diva-161300 (URN)10.3384/diss.diva-161300 (DOI)9789176850091 (ISBN)
Public defence
2019-12-10, Planck, Fysikhuset, Campus Valla, Linköping, 13:15 (English)
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Available from: 2019-11-08 Created: 2019-10-28 Last updated: 2019-11-08Bibliographically approved

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Ekeroth, SebastianBoyd, RobertMünger, PeterHelmersson, Ulf

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