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Nanoparticle growth by collection of ions: orbital motion limited theory and collision-enhanced collection
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-3767-225X
University of Paris 11, France.
University of Paris 11, France.
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-1744-7322
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2016 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 49, no 39, p. 395208-Article in journal (Refereed) Published
Abstract [en]

The growth of nanoparticles in plasma is modeled for situations where the growth is mainly due to the collection of ions of the growth material. The model is based on the classical orbit motion limited (OML) theory with the addition of a collision-enhanced collection (CEC) of ions. The limits for this type of model are assessed with respect to three processes that are not included: evaporation of the growth material, electron field emission, and thermionic emission of electrons. It is found that both evaporation and thermionic emission can be disregarded below a temperature that depends on the nanoparticle material and on the plasma parameters; for copper in our high-density plasma this limit is about 1200 K. Electron field emission can be disregarded above a critical nanoparticle radius, in our case around 1.4 nm. The model is benchmarked, with good agreement, to the growth of copper nanoparticles from a radius of 5 nm-20 nm in a pulsed power hollow cathode discharge. Ion collection by collisions contributes with approximately 10% of the total current to particle growth, in spite of the fact that the collision mean free path is four orders of magnitude longer than the nanoparticle radius.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2016. Vol. 49, no 39, p. 395208-
Keywords [en]
nanoparticle synthesis; pulsed plasma; complex plasmas
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-132204DOI: 10.1088/0022-3727/49/39/395208ISI: 000384239200004OAI: oai:DiVA.org:liu-132204DiVA, id: diva2:1043957
Note

Funding Agencies|Knut and Alice Wallenberg foundation [2014.0276]; Swedish Research Council under Linkoping Linneaus Environment LiLi-NFM [2008-6572]; Ministry of Education and Science of the Russian Federation [14.Y26.31.0005]; Increase Competitiveness Program of MISiS

Available from: 2016-11-01 Created: 2016-10-21 Last updated: 2018-03-15
In thesis
1. Electronic and structural properties of nanoclusters
Open this publication in new window or tab >>Electronic and structural properties of nanoclusters
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nanoclusters have gained a huge interest due to their unique properties. They represent an intermediate state between an atom and a solid, which manifests itself in their atomic configurations and electronic structure. The applications of nanoclusters require detailed understanding of their properties and strongly depend on the ability to control their synthesis process. Significant effort has been invested in modelling of nanoclusters properties. However, the complexity of these systems is such that many aspects of their growth process and properties are yet to be understood.

My thesis focuses on describing structural and electronic properties of nanoclusters. In particular, the model for nanoparticles growth in plasma condition is developed and applied, allowing to describe the influence of the plasma conditions on the evaporation, growth and morphological transformation processes. The mechanism driving the morphology transition from icosahedral to decahedral phase is suggested based on force-fields models. Spectroscopic methods allow for precise characterization of nanoclusters and constitute an important tool for analysis of their electronic structure of valence band as well as core-states. The special attention in the thesis is paid to the core-states of nanoclusters and influences that affect them. In particular, the effects of local coordination, interatomic distances and confinement effects are investigated in metal nanoclusters by density functional theory methods. These effects and their contribution to spectroscopic features of nanoclusters in X-ray photoemission are modelled. The relation between the reactivity of nanoclusters and their spectroscopic features calculated in different approximations are revealed and explained. Ceria is a very important system for many applications due to the ability of cerium atoms to change their oxidation state depending on the environment. The shift of the oxidation state and its effects on the core-states is examined with X-ray absorption measurements and modelling allowing to build a rigid foundation for interpretation of the measured spectra and characterization of electronic structure of ceria nanoparticles.  

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2018. p. 78
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1912
National Category
Theoretical Chemistry Other Physics Topics
Identifiers
urn:nbn:se:liu:diva-145684 (URN)10.3384/diss.diva-145684 (DOI)9789176853498 (ISBN)
Public defence
2018-04-20, Planck, Fysikhuset, Campus Valla, Linköping, 10:15 (English)
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Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-03-15Bibliographically approved

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