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Nanostructured CNx (0 < x < 0.2) films grown by supersonic cluster beam deposition
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2005 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 43, 1460-1469 p.Article in journal (Refereed) Published
Abstract [en]

Nanostructured CNx thin films were prepared by supersonic cluster beam deposition (SCBD) and systematically characterized by transmission electron microscopy (TEM), electron energy-loss spectroscopy (EELS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The incorporation of nitrogen in the films (0 < x < 0.2) and the nanostructure were controlled by using different synthesis routes. Films containing bundles of well-ordered graphene multilayers, onions and nanotubes embedded in an amorphous matrix were grown alongside purely amorphous films by changing the deposition parameters. Graphitic nanostructures were synthesized without using metallic catalysts. The structural and electronic properties of the films have been studied by EELS. The role played by N in the carbon nanostructures has been deduced from XPS line-shape analysis.

Place, publisher, year, edition, pages
Oxford: Elsevier , 2005. Vol. 43, 1460-1469 p.
Keyword [en]
Electron energy loss spectroscopy, Electron microscopy, X-ray photoelectron spectrosopy, D. electronic structure, Chemical structure
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-49670DOI: 10:1016/j.carbon.2005.01.022OAI: oai:DiVA.org:su-49670DiVA: diva2:379189
Note
Authors - beyond those already mentioned at Stockholm University - include: G. Bongiorno, M. Blomqvist, P. Piseri, P. Milani, C. Lenardi, C. Ducati, T. Caruso, P. Rudolf, E. Coronel.Available from: 2010-12-17 Created: 2010-12-17 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Analytical Electron Microscopy Studies for Development of New Carbon Based Materials
Open this publication in new window or tab >>Analytical Electron Microscopy Studies for Development of New Carbon Based Materials
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The thesis presents transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) studies of new carbon based materials synthesized with two different techniques. In the first project, nitrogen is incorporated into carbon nanostructures by supersonic cluster beam deposition (SCBD) to favor the formation of curved and cross-linked structures, ultimately aiming at creating a material with high hardness combined with good elasticity. The second project deals with nanoporous carbon derived from various carbides (VC, WB, NbC, TaC, HfC, ZrC and TiC) synthesized at temperatures ranging from 700 to 1200 °C, ultimately aiming at creating a porous material with large surface area and narrow poor size distribution. In both projects, the results of different synthesis conditions are investigated with the help of high resolution TEM and EELS. Structural and chemical information about the samples is extracted and it is found that it is possible to alter the nanostructure depending on the synthesis conditions. The thesis ends with implementation and evaluation of Gold’s iterative deconvolution method for enhanced energy resolution in EEL spectra. Relevant background about the chemical elements, transmission electron microscopy and electron energy loss spectroscopy is included in the introductory chapters.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 136 p.
Keyword
TEM, EELS, CNx thin films, Carbide derived carbons, Gold deconvolution, Resolution improvement
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-49549 (URN)978-91-7447-191-5 (ISBN)
Public defence
2011-01-21, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2010-12-29 Created: 2010-12-15 Last updated: 2010-12-17Bibliographically approved

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