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Titanium oxide nanoparticle production using high power pulsed plasmas
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis covers fundamental aspects of process control when growing titanium oxide nanoparticles in a reactive sputtering process. It covers the influence of oxygen containing gas on the oxidation state of the cathode from which the growth material is ejected, as well as its influence on the particles oxidation state and their nucleation. It was found that a low degree of reactive gases was necessary for nanoparticles of titanium to nucleate. When the oxygen gas was slightly increased, the nanoparticle yield and particle oxygen content increased. A further increase caused a decrease in particle yield which was attributed to a slight oxidation of the cathode. By varying the oxygen flow to the process, it was possible to control the oxygen content of the nanoparticles without fully oxidizing the cathode. Because oxygen containing gases such as residual water vapour has a profound influence on nanoparticle yield and composition, the deposition source was re-engineered to allow for cleaner and thus more stable synthesis conditions.

The size of the nanoparticles has been controlled by two means. The first is to change electrical potentials around the growth zone, which allows for nanoparticle size control in the order of 25-75 nm. This size control does not influence the oxygen content of the nanoparticles. The second means of size control investigated was by increasing the pressure. By doing this, the particle size can be increased from 50 – 250 nm, however the oxygen content also increases with pressure. Different particle morphologies were found by changing the pressure. At low pressures, mostly spherical particles with weak facets were produced. As the pressure increased, the particles got a cubic shape. At higher pressures the cubic particles started to get a fractured surface. At the highest pressure investigated, the fractured surface became poly-crystalline, giving a cauliflower shaped morphology.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2016. , 48 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1748
National Category
Materials Chemistry Chemical Process Engineering Metallurgy and Metallic Materials Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-128622DOI: 10.3384/lic.diva-128622ISBN: 978-91-7685-766-3 (print)OAI: oai:DiVA.org:liu-128622DiVA: diva2:930816
Presentation
2016-06-16, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2016-05-25 Created: 2016-05-25 Last updated: 2016-05-25Bibliographically approved
List of papers
1. Synthesis of titanium-oxide nanoparticles with size and stoichiometry control
Open this publication in new window or tab >>Synthesis of titanium-oxide nanoparticles with size and stoichiometry control
2015 (English)In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896X, Vol. 17, no 9, 353- p.Article in journal (Refereed) Published
Abstract [en]

Ti-O nanoparticles have been synthesized via hollow cathode sputtering in an Ar-O-2 atmosphere using high power pulsing. It is shown that the stoichiometry and the size of the nanoparticles can be varied independently, the former through controlling the O-2 gas flow and the latter by the independent biasing of two separate anodes in the growth zone. Nanoparticles with diameters in the range of 25-75 nm, and with different Ti-O compositions and crystalline phases, have been synthesized.

Place, publisher, year, edition, pages
Springer Verlag (Germany), 2015
Keyword
Titanium dioxide; TiO2; Reactive sputtering; Size control; Composition control; Gas flow sputtering; Aerosols
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-121300 (URN)10.1007/s11051-015-3158-3 (DOI)000360245300002 ()
Note

Funding Agencies|Knut and Alice Wallenberg foundation [KAW 2014.0276]; Swedish Research Council via the Linkoping Linneaus Environment LiLi-NFM [2008-6572]

Available from: 2015-09-16 Created: 2015-09-14 Last updated: 2017-12-04

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Gunnarsson, Rickard

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